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December 10, 2018, 18:36:41 PM

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Author Topic: *NEW* HobbyKing EFX Racer  (Read 18856 times)

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Offline Cactus

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Re: *NEW* HobbyKing EFX Racer
« Reply #80 on: January 06, 2015, 13:29:41 PM »
nope, my weight fell out and i didn't notice. i've upped the elevator throw too so it must be pretty tollerant.
I know you believe you understand what you think i said, but i am not sure you realise that what you think you heard is not what i meant.


Offline Monday

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Re: *NEW* HobbyKing EFX Racer
« Reply #81 on: January 06, 2015, 14:19:33 PM »
OMG just had the first flight, one of those heart thumping am I going to get this down moments... not sure why, but it was twitching all over the place...

I've got a 180g pack in with an additional 50g weight in the nose, which I raised to 80g for the second flight... I think that made it a bit easier but there wasn't much in it... have the C of G on 50mm... I can't beleive others are flying at 55 and more... :o

Got the stock throws setup - didn't get the chance to go to min (fast) settings as I kept it slow and I didn't feel like I was overcorrecting - got 25% expo dialed in too...

There is a slight wind but nothing to worry about, flown at the same field in much stronger... and I see what you mean by needing downtrim, but not the "solid" flight I was expecting, so questions: am I just not used to a) a foamie or b) am I flying it too slow? or c) shall I bring the c of g further forward untill I get my head around it??

I do get a fair bit of lift and cross wind from the field / hill I fly  - I can get an full luchtime out of one throw of a DLG on a good day - is this making the EFX jump around??

I remember the first flights with an edf jet having similar heart stopping problems, and now I fly that happily... so maybe it's just me having had a couple of months off and jumping into this with a little too much enthusiasm... I'll get a few flights in with something else I think then re-visit...

Regarding the downtrim - what is everyone setting it too? Or is there a better solution (someone suggested modifying the motor mount I think).

Nice to fly something that reminds you you're still alive though ha ha ha - and happy to get it down in one piece!!

Offline Cactus

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Re: *NEW* HobbyKing EFX Racer
« Reply #82 on: January 06, 2015, 14:34:32 PM »
have a look how much the zippy 2200 3 cells weigh, thats what i first used, now using the 2800's
I know you believe you understand what you think i said, but i am not sure you realise that what you think you heard is not what i meant.


Offline Cactus

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Re: *NEW* HobbyKing EFX Racer
« Reply #83 on: February 09, 2015, 13:34:58 PM »
Just thought i'd add to this old thread, which is probably silly as you can't get them from hobbyking at the mo.
on my 2800's yesterday I outlasted 2 trainers and a Cougar 2000, up first by about 5 mins, down last by about 2 :co
ok i was only pottering about in chilled sport mode, 1/4 throttle max most of the time with short bursts of full for fun, but i'm convinced the kit version with a less agressive motor would make a lovely sport flyer.
it's so precise and forgiving, it looks great pootling about at blixer speeds.
I know you believe you understand what you think i said, but i am not sure you realise that what you think you heard is not what i meant.

Offline Butzi

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Re: *NEW* HobbyKing EFX Racer
« Reply #84 on: February 09, 2015, 22:20:24 PM »
I think it looks good at any speed, and no need to fit a less aggressive motor, just employ good throttle management like you were obviously doing. 
Oh, and just to reconfirm, yellow is the best colour!  :ev


Offline Cactus

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Re: *NEW* HobbyKing EFX Racer
« Reply #85 on: February 09, 2015, 22:39:12 PM »
i dunno, the motor is fine, but with one that'll swing a 8x4 you'd get more thrust which would make sport flying easier and less about momentum, which is fun in it's self.
I know you believe you understand what you think i said, but i am not sure you realise that what you think you heard is not what i meant.

Offline Butzi

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Re: *NEW* HobbyKing EFX Racer
« Reply #86 on: February 09, 2015, 23:18:54 PM »
Hmm, I see what you mean. Maybe even a folding prop for some gliding, or Hotliner style antics?

Offline Cactus

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Re: *NEW* HobbyKing EFX Racer
« Reply #87 on: February 10, 2015, 07:27:03 AM »
i don't think it's clean enough for that.
I know you believe you understand what you think i said, but i am not sure you realise that what you think you heard is not what i meant.

Offline gavin mack

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Re: *NEW* HobbyKing EFX Racer
« Reply #88 on: February 20, 2015, 08:57:22 AM »
Back in  UK Warehouse
Gravity never loses, The best you can hope for is a draw
It takes 2 years to learn how to talk, and a life time to control your mouth.


Offline Cactus

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Re: *NEW* HobbyKing EFX Racer
« Reply #89 on: February 20, 2015, 09:04:34 AM »
SOIL THE BED! didn't think i'd see that.
bet their not as cheap tho. :(
I know you believe you understand what you think i said, but i am not sure you realise that what you think you heard is not what i meant.

Offline capt2724

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Re: *NEW* HobbyKing EFX Racer
« Reply #90 on: July 28, 2015, 18:13:32 PM »
Hi all,
I have just purchased one of these a Red one. However getting the correct CofG is a problem I can't get it any further forward than 57mm using a 3s or 4s zippy 40c lipo.

Any measurements of your CofG will be welcome.

Phil

Offline trebor

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Re: *NEW* HobbyKing EFX Racer
« Reply #91 on: July 28, 2015, 19:02:08 PM »
Hi all,
I have just purchased one of these a Red one. However getting the correct CofG is a problem I can't get it any further forward than 57mm using a 3s or 4s zippy 40c lipo.

Any measurements of your CofG will be welcome.

Phil

I've just checked the c of g on mine and it's at 60mm from the leading edge, originally I had some lead in the nose but like cactus' mine fell out and I never noticed. It's one of the easiest planes I've flown it's only the speed that makes it get interesting ;D, slow it down and it's a pussycat.
I use the the minimum throws on the elevator but as much as I can get on ailerons and rudder.
Have fun
Rob

Offline capt2724

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Re: *NEW* HobbyKing EFX Racer
« Reply #92 on: July 28, 2015, 19:10:57 PM »
Thanks Rob,

I can get mine to about 58mm without lead so I might try it at that, I don't want to have to add ballast.

Phil

Offline Cactus

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Re: *NEW* HobbyKing EFX Racer
« Reply #93 on: July 29, 2015, 23:01:40 PM »
a 2200 3 cell is a fraction tail happy, a 2800 3 cell is perfect. no one here changes anything when swapping all sorts of batteries, it just flies right whatever. its one of the best flying planes I've ever tried
I know you believe you understand what you think i said, but i am not sure you realise that what you think you heard is not what i meant.

Offline e-flite_rules

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Re: *NEW* HobbyKing EFX Racer
« Reply #94 on: July 30, 2015, 17:14:15 PM »
Hi,

Is it possible to fit a 35mm motor?

Offline Cactus

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Re: *NEW* HobbyKing EFX Racer
« Reply #95 on: July 30, 2015, 19:49:00 PM »
I know two of our guys have fitted the next kv motor up in the range, bloody quick now! don't know diameter tho
I know you believe you understand what you think i said, but i am not sure you realise that what you think you heard is not what i meant.

Offline Bad Raven

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Re: *NEW* HobbyKing EFX Racer
« Reply #96 on: July 31, 2015, 21:24:01 PM »
I have one on way to me................. Hope it's as indicated and not the dog that the Lancaster is!!   :banghead:
The user formerly know as Bravedan........... Well if Prince can do it....................


Offline Cactus

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Re: *NEW* HobbyKing EFX Racer
« Reply #97 on: July 31, 2015, 21:31:20 PM »
it's quite probably the nicest flying plane i've ever had.
i actually enjoy flying it very slow on calm eve's, if you're expecting an all out super accurate pylon racer you're misunderstanding foam models, but for what it is, superb
I know you believe you understand what you think i said, but i am not sure you realise that what you think you heard is not what i meant.

Offline propeak

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Re: *NEW* HobbyKing EFX Racer
« Reply #98 on: August 01, 2015, 01:29:11 AM »
I bought the kit version but havn't had time to touch it and it's still in my garage unopened, The rtf version uses the ntm 2836 2300kv motor, I have a 2836 2700kv and a 3000kv to try in it so should be quite exciting if i ever find the time to assemble it, It had also crossed my mind as Cactus suggested to fit a lower kv motor with a larger prop and just have it as a nice flying sport model, I have a number of fast wings and deltas so ask myself do i need another howler to beat up the strip, The way things are at the moment i'll probably have plenty of time to think about it.

Offline Bad Raven

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Re: *NEW* HobbyKing EFX Racer
« Reply #99 on: August 17, 2015, 19:41:29 PM »
Mine flew today for the first time.

Currently it only has the 3S option on as I don't have small enough 4S packs to fit.  I didn't balance it, its flying as fitted with the NanoTech 2200mAh 3S, somewhat rearward of their stated range, and is neutral on inverted.

Yea, no pylon racer as to top speed, but quick enough to be fun, and very smooth.

I have spoileron/flapperon programmed, and on two flights today in little wind found the spoileron useful for spot landings (our patch is tree ringed so a diving approach to the short strip tests any planes braking ability. 

Quite impressed so far.
The user formerly know as Bravedan........... Well if Prince can do it....................

Offline Butzi

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Re: *NEW* HobbyKing EFX Racer
« Reply #100 on: August 17, 2015, 22:42:01 PM »
Maybe this version would suit your needs better as it has separate flaps.   :af

 http://www.dragonhobbyusa.com/airplanes/high-performance/dragon-furious-200-red-pnp-80.html

Offline Cactus

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Re: *NEW* HobbyKing EFX Racer
« Reply #101 on: August 17, 2015, 22:44:13 PM »
i like many others fitted a small amount of lead in the nose only to find sometime later it had departed and not noticed any adverse effect.
my fave pack for this model is the 2800mah 3 cell which can give as many amps as the higher C packs but you get another 2 mins or so of full power over your mates, or 20-30 mins of pottering about.

if you want fun try these two fun things.
pull full up at full speed, you won't break it and it won't screw out, do the same in a bank, it's crazy. i actually moved my elevator out a hole at the tail to calm it a little and it's still nuts.

full speed into a climb then push both sticks into the upper corners, i forget which direction is the really silly ficks but from full speed zoom vertical it'll end up in an inverted flat spin.
keep the sticks there and release when it falls back just about to come back the other way, instant recovery and very impressed onlookers.

good thing you went with spoliers, low drag and no stalling means very long landings.
I know you believe you understand what you think i said, but i am not sure you realise that what you think you heard is not what i meant.

Offline Bad Raven

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Re: *NEW* HobbyKing EFX Racer
« Reply #102 on: August 18, 2015, 10:11:34 AM »
Maybe this version would suit your needs better as it has separate flaps.   :af

 http://www.dragonhobbyusa.com/airplanes/high-performance/dragon-furious-200-red-pnp-80.html


Thanks, please don't think I'm ungrateful for the info, and you might be able to upward spoiler the flaps on that, but I have found downward flaps very unsuitable for our field, a poor balance between floating on and being so slow it'll be unresponsive. (I now also do not buy from offshore stock so no surprise customs/fees)

Although I programme flaps/spoilers on aileron on almost everything, and have experimented a lot, I rarely use flaps as spoilers are the proven way to go here, giving the ability to slow naturally clean and then near the threshold deploy spoilers and sink slightly nose high onto the patch, so no chance of catching and/or ground looping, esp with low wing belly landers like the EFX.

I have not had any problems of spoiler inhibiting or masking aileron action, mainly as I set the amount up very carefully not to out power them.
The user formerly know as Bravedan........... Well if Prince can do it....................

Offline Bad Raven

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Re: *NEW* HobbyKing EFX Racer
« Reply #103 on: April 21, 2017, 06:46:20 AM »
OK have posted here since its titled right even though its an old thread!!

Anyone still flying the first excellent sports fly EFX Racer, not the EFXtra? It so, a heads up.

Last time flown mine went very unstable on hand release, and it was a challenge to get it down gently and without damage, (I launch left handed so have control over A and E but open throttle with my mouth, and with only one hand on Tx it takes a second or two to get to throttle stick or throttle cut switch so no instant way to chop throttle)

What I found was that the a couple of the four screws holding the plastic motor plate to the plastic nose/Fus mount had under the launch thrust pulled through the plate, giving it massive thrust offset. I do check the motor security by trying to wobble the spinner before flight, it wasn't loose

The heads of these screws are only marginally bigger than the holes in the plate, in fact they seemed to rely on not being aligned so one side bites!

Standard 2mm washers fit and solve the issue. If yours has not been apart or you have not inspected, you might like to before the plane tries to devour its own tail?

BTW, have inspected my EFXtra and it has a metal motor plate and larger headed screws so I doubt the same issue would occur.

HTH
The user formerly know as Bravedan........... Well if Prince can do it....................

Offline Bad Raven

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Re: *NEW* HobbyKing EFX Racer
« Reply #104 on: October 11, 2018, 08:38:46 AM »
So, after lots more flying the same torque sensitivity on launch causing violent left roll on launch throttle up returned (at careful throttle settings it never had before).

This time I removed the motor completely, to find that the cruciform motor mount had delaminated and the thinner remaining cruciform section holding motor to plastic mount was allowing motor flex under thrust despite the screws being tight, this even though I'd tried to wobble it under inspection and it had seemed secure.

To remove the motor you have to remove the ESC which is buried back behind the wing, to gain free wiring to pull motor out.

As HK have relaunched the EFX Racer (rather than the EFX Extra, which I also have but do not like as much) but with the revised fuselage interior, bigger motor, metal spinner, etc, I have bought another, and the original will gain the slope nose as a glider.

So, you REALLY might like to replace the carbon plate with metal!   ;D

The user formerly know as Bravedan........... Well if Prince can do it....................

Offline e-flite_rules

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Re: *NEW* HobbyKing EFX Racer
« Reply #105 on: October 11, 2018, 08:50:53 AM »
Hi,

Looking at their website it looks like they've reissued the EFX Racer but with the powertrain from the EFXtra.  Hopefully they've fixed the mount weakness too.




https://hobbyking.com/en_us/duraflytm-efx-racer-pnf-yellow-edition.html

Offline Bad Raven

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Re: *NEW* HobbyKing EFX Racer
« Reply #106 on: October 11, 2018, 09:05:25 AM »
Stated as having metal like the EFX Extra. Would need it for the larger motor. Will know on Monday!!

I have to add, mine only failed after lots and lots and LOTS of flights, and without a folding prop the shock loads of landings stopping the windmilling prop dead must take its toll
The user formerly know as Bravedan........... Well if Prince can do it....................

Offline e-flite_rules

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Re: *NEW* HobbyKing EFX Racer
« Reply #107 on: October 11, 2018, 09:14:03 AM »
So you've ordered one?

Offline Bad Raven

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Re: *NEW* HobbyKing EFX Racer
« Reply #108 on: October 11, 2018, 09:23:41 AM »
Of course..............................  ;)
The user formerly know as Bravedan........... Well if Prince can do it....................

Offline e-flite_rules

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Re: *NEW* HobbyKing EFX Racer
« Reply #109 on: October 11, 2018, 10:39:57 AM »
I await the feedback!

Offline Bad Raven

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Re: *NEW* HobbyKing EFX Racer
« Reply #110 on: October 15, 2018, 18:39:55 PM »
OK, it's arrived, free postage.  The Yellow one this time.

I'm sure that my first one (with smaller motor and battery space) came with a printed manual.  This one didn't.  The website page states that the manual is under the FILES Tab, it isn't!

As "building" consists of connecting a receiver, screwing on the wing, pushing the quick fit tailplane halves on, connecting links and spinner/prop, the manual only really serves to pass CG and throws, except of course it doesn't as it does not exist!

The motor mount is METAL.

The spinner is metal. 8x6 (3S) and 7x6 (4S) props are supplied.

Off to the workbench........................briefly!



The user formerly know as Bravedan........... Well if Prince can do it....................

Offline propeak

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Re: *NEW* HobbyKing EFX Racer
« Reply #111 on: November 02, 2018, 13:32:10 PM »
Been waiting for an update from Bad Raven but no joy so far, So here's my two pence worth,
I have two of the original efx racers one arf and one put together from the kit, I tend to fly the arf on 4 cells and the kit version on 3 cells which to be honest is plenty fast enough for me these days, Anyway i recently picked up a motor from the newer efx extra and seeing that HK are now doing the original with this motor fitted i though i would graft this into my kit version, The plastic mount bonded into the fuz will acommodate both sizes of motor you just need to remove a little foam from the four mounting points with a sharp blade, I always thought it needed some down thrust so added a washer both sides at the top, these were tacked to the back of the cross mount with a dab of cyno otherwise would be impossible to fit,
HK say 7x6 on 4 and 8x6 on 3 so i thought id'e try it initially with the 7x6 on 3 with an 8x6 at the ready, The results were on 3 cells with the 7x6 it's almost as fast as my other one on 4 cells so i didn't bother fitting the 8x6, Also a big improvement in battery economy, After a 5 minute flight i expected as before the battery would be showing around 20 percent the results were the battery showing 50 percent, This was using Gens Ace 2200 mah which are a few years old but still going strong, So the conclusion is i'll be sticking with this set up on this model, Plenty fast enough for me as i'm turned seventy now.

Offline Bad Raven

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Re: *NEW* HobbyKing EFX Racer
« Reply #112 on: November 03, 2018, 06:54:52 AM »
There is no update as I have either been away or unable to get to the field on a day when the weather suited, more specifically when the field was not sopping wet with rain or dew or melted frost and splattered with soggy worm casts. I wasn't going to get the foam brown tinted or the innards wet and likely then go rusty after the first flight, and the shape with under scoops does tend to take up water. Also while I don't mind hand launching, I try to avoid it for a maiden flight!

Also, have been away in North Devon, taking among other models the EFX Racer No 1 now sans motor and fitted with slope nose and NIMH radio power.  That trip was not FOR sloping which was just as well as the wind stayed resolutely in a direction that didn't suit where I was or where I could get to since I can't walk long distances over rough ground carrying stuff. Needless to say I found a number of great spots for wind directions I didn't get, and had lots of pain trying to park the car anywhere remotely suitable!!

With regard the prop, I tended to use the 8x6 on 3S, but the larger motor cries out for 4S (I have the EFX Extra, always flown on 4S and 7x6 APC Speed or Graupner).

Duration?  Who cares....................   :ev

I'm 70 too now but with weekly RC car and now RC micro hovercraft racing and flying whenever I can, sometimes four or five sessions in a week, I have maintained a decent level of reactions. Using identical equipment I beat a group of 12-16 year olds yesterday with the hovercraft, winning two of three heats and the "A" Final!!

The worst thing with the upgraded motor (in the EFX Extra) is the torque roll tendency, launching is easy as long as you manage to get the right throttle for the wind to ease it out of your hand, but even slightly more than needed and its a violent roller coaster ride. It's def no longer as easy in very light winds. It is blisteringly fast though  :af , and quiet with it, unlike any of my fast wings/deltas on pusher or prop in slot.

With the extra space I can "just" squeeze in a screamer alarm to warn if any cell is dragged under set voltage, which I started using with Quads and has now spread to all my electric models. The hard cased GT power ones can be set to a voltage (I set to 3.6v) and are loud enough to hear even when sealed inside a foam Fus. Yes, I have telemetry, but this is crude, reliable, and VERY effective!

I will report when its flown..................... sometime...............  :''
The user formerly know as Bravedan........... Well if Prince can do it....................

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