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Author Topic: Ripmax Easy Street quick review  (Read 2957 times)

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Offline Cactus

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Ripmax Easy Street quick review
« on: April 29, 2006, 17:41:00 PM »
At Rougham i was determined to buy something for my 400 size brushless motor, i spied first a Projeti for £40, not bad, kinda wanted one but after the Microjet i wanted something a bit different, in retrospect maybe i should have got that box.

but i fancied something a bit more plane like, something to climb and dive with, something i can hack about, not just fly flat out as low as poss.

sitting at the back was an ARTF Easy Street for £35

ok it's meant for a 600, but thats a can motor and the old cells. my brushless and 3 cell li-po should be nice.

after some pondering and box prodding i plumped for the Easy.

The Easy Street first came to us as a Malcom Corbin free plan and i believe a CNC kit.
as with a few of Malcs designs they got Ripmaxed.

First impression was exactly the same as my Coyote, it was going to be a so-so build.
the putting together of bits is pretty easy, everything lines up ok apart from the elevator joiner which was twisted resulting my my elevator half's being slightly out, yep, i saw that after i glued it all together. :-\

it's designed to use 3 SD200 servos but the boxes arn't well made for them, the cable exit is pushed up against the edge and theres nowhere for the exit of the cable.
in the end i dug out most of the balsa box liners and left the wire coming out of the sides.

now came the fun and games.

the torque rods are slotted as such so you can lay them flat to get the wings in, but the slots are so narrow you can't get much throw. this i sorted with my knife.


pushrods... oh dear...
the Z bends arn't bent very far, and a tweak with my z benders snapped then, brittle metal these rods so i made some new ones for the ailerons.
the elevator and rudder servos both sit right at the front of the wing, and both the pushrods are the same lenght meaning the rudder was now too short to reach the horn.

i cured this by turning the servo around ( scarficing some cable lenght ) and using a standard solder adaptor not the mini ones they supply.
with everything hooked up the unsupported wires flex a bit on the push leaving me with limited down elevator and right rudder  :(


despite all this flex in the radio bay the rods are quite stiff and don't like the bend round to the horns, some kinks sorted this but the cross over in the fuz stiffens the whole lot up a fair amount, this probably isn't helping the flex near the servos.
depending on how it goes i may replace the whole lot with some more springy piano wire.


the motor was next in, of course the mount is drilled for a 600 so some slots where made in the shaft opening and my motor screws done up with washers.
this should be ok but I'll be checking soon into the first flight.
course with those big cap head screws up front my prop adaptor now refused to sit right back, but it seems ok where it is.


with the li-po being a tight fit in the battery bay under the wing the CofG was checked, too far back.
with the battery in the bay infront it was just right so some velcro sorted this with the Hitec receiver sitting in a small gap just infront of the servos.
the speedo controller sits above the motor, not ideal, but too much hassle to keep moving it to get the cells out.


the front hatch is held with a single screw.. only, i don't want to be playing with screws.
first this is an electric hack, simple plug and play, not plug screw play screw.
second if you want the pack out quick you don't want to be messing with a screw.

a tab was added to the rear of the plate and some magnets to the front.

this turned out to be a wise move as the ply screw mount plate fell off, it should be over that hole


last job canopy, not a great fit, the wood former pulls it in too tight splaying it out at bottom of the fuz.
not a great fit at the front either, but i want a hack, not perfection.



on a 5.5x4.5 APC it's almost pulling 1:1 but I've yet to find a 6x4 to try, should be better on that but good enough for what i want.

so like the Coyote it's showing ARTF quality of a few years past, the wing where film was removed for gluing showed more signs of filler than wood but what let it down was in the lack of planning and not ideal fittings, the short pushrod and tight servo boxes being my biggest annoyances.
easy enough for someone with experience and spare bits to sort out but it'd stop someone wanting this as their second plane dead in their tracks.

with a bit of patience i could have sorted these things and the cosmetics, but i just wanted it done quick and flyable.
hopefully I'll test fly it tomorrow



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 BridlingtonFlyer

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Re: Ripmax Easy Street quick review
« Reply #1 on: April 29, 2006, 23:25:57 PM »
Looks good.  I've got a balsacraft kit version that is next on the build list

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Offline PDR

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Re: Ripmax Easy Street quick review
« Reply #2 on: April 30, 2006, 00:40:53 AM »
Check the glue joints between the motor mount and the fuselage - the motor mount on mine turned out to be held on almost entirely by the covering film. At least it was until half way through the third flight - after that the motor was retained by the ESC leads, an the thrust line changed to around 90 degrees of downthrust...

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Offline Cactus

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Re: Ripmax Easy Street quick review
« Reply #3 on: April 30, 2006, 08:50:27 AM »
thanks Pete.

just about to head out to Perranporth airfield for a local show we've been asked to fly at, will be testing it there but i'll run some glue around first.
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Offline Cactus

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Re: Ripmax Easy Street quick review
« Reply #4 on: May 03, 2006, 20:59:29 PM »
didn't get to fly at Perran, too windy but more important, lots of planes parked up where we had to fly.. and then the ones that move, past us, over us... chaos.

so, winds dropped tonight out with the ES.

first thing i noted in pre flight was the staggering amount of bend that showed up with down elevator or right rudder.
worse than when i first fitted them.
first step will be to see if the surfaces have stiffened up where the last of the cyno set.
second replace those rubbish rods.

right from the underarm launch she went straight and true on just under full throttle ( full throttle gives lots of vibration, still under propped or is the shaft bent from the MJ crash? )
even on 3/4s throttle climb was good and full gave almost vert, a 6x4 prop should help here.
the MJ was on a 5x5 and ok, the Zap was a 5.3x4 and 5.5x4.5 ( what the ES is now on ) and vibrated like mad.

considering this is a 600 design the little 400 and 3 cell pack give great performance.
it's not far off the Zap, and that was a much smaller light 400 size plane with just two mini servos, not 3 SD200's

the rolls arn't perfectly axial but the the torque rods weren't bent perfectly, the links arn't even close to inline with the ailerons neutral.
however the ailerons bite nicely and the rolls are nice and quick.
the elevator felt perfect and i still had enough down for inverted flight which only required a slight amount of down elevator.

rudder isn't enough for KE, but I'm not even close to reccomended throw thanks to the choice of horn shown.

it flew really well and as such deserves to have these niggles sorted.
the stall was nothing, the wing drop such as it was could be corrected with the rudder.
with the motor cut the glide is pretty quick, but it doesn't help the servos not quite getting neutral each time thanks to those pushrods.
i can't really fault the flying. it's smooth, predictable but also shows signs of fun once i get the throws sorted.
I've not even got any expo dialed in!

so yet another great flying Ripmax plane, just let down by a few bad choices in design and fittings.
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 Chippie

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Re: Ripmax Easy Street quick review
« Reply #5 on: May 03, 2006, 21:17:45 PM »
Cactus,

Could you post up powertrain details please?

Motor/prop/battery pack would do nicely, I have 2 ESs and an
Axi 2814/10... :-\
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Offline Cactus

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Re: Ripmax Easy Street quick review
« Reply #6 on: May 03, 2006, 21:23:11 PM »
oky dokey...

Align 400lf
Tornado 40A esc
2200mAh RCMDirect 3 cell lunpoly
5.5x4.5 prop, vibrates like mad, could be under propped, could be bent shaft but i'll have to check.
the instructions reccomend a 5x3, but this would destroy it with RPM.
only vibrates at full RPM, was also banging off what sounded like a rev limit.
even the esc cut at this point till i chopped the throttle.
6x4 on the way.

whats a 28wotsit? at least my Align tells you it's a 400...

Overlander do a powet set for £109 that would suit perfectly, but it flys very well on this 400 set up, as good if not better than the old 600's and can cells. so much lighter too.
will get my AUW when i next go up the shed.
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 Chippie

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Re: Ripmax Easy Street quick review
« Reply #7 on: May 03, 2006, 21:41:20 PM »
Cheers Cactus,

Sounds like your Align is akin to my Mega 16/15/4....not much cop really for an ES as its a sp400 drop in.The Axi is good enough to replace a 25 motor...but runs a 9*6 prop on 2s or 8 cells...
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Offline Cactus

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Re: Ripmax Easy Street quick review
« Reply #8 on: May 03, 2006, 21:54:48 PM »
i dunno, my Align isn't a bad choice, i was flying 1/4 - 1/2 throttle most of the time and was pretty happy with power. it's no straight 400 brushed replacement
sorting my prop or shaft should make it perfect.

infact, i'm thinking shaft.
the instructions say 5x3
the 5x5 in the MJ was good and the pack didn't warm much despite the KJ being full throttle all the time.
it's now warm on this prop and my run times arn't much differnt despite much lower throttle settings.

maybe it's not over revving?

the Axi should be ballistic.
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 nick j

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Re: Ripmax Easy Street quick review
« Reply #9 on: May 03, 2006, 22:03:55 PM »
They seem pretty versatile on power-train: as you say designed for brushed sp600 direct drive and obviously going like stink on 400 brushless. I run one on a 3.8 geared brushed 480 10x8" prop / 2/3C 1100 NiMH, which is pretty tame but fine for we cheapskate beginners. Nigel Hawes' review a while ago said a 9th cell made it a lot livelier on this sort of set up.

Do agree about the dreadful push-rods - had just the same experience when I attacked them with the z-bender.
Nick Jackson

Offline Cactus

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Re: Ripmax Easy Street quick review
« Reply #10 on: May 03, 2006, 22:11:46 PM »
i'll either replace with piano wire or maybe carbon rods suitable strenghten in the wing bay to stop flexing.
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Offline PDR

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Re: Ripmax Easy Street quick review
« Reply #11 on: May 04, 2006, 09:38:55 AM »
The Axi 2814/10 is a very good match for the Easy Street - in fact it was one of the original "performance" upgrades for it using 8 cells and a 10-6/7. On a 3s pack and an 8-6/7 or 9-6 it would probably be ballistic!

I have to say that when building mine I gave up on the supplied rudder/elevator linkages. I ripped them out and replaced them with PTFE snakes. I also felt that the supplied hinges were way too stiff and I replaced them with Kavan (pinned) hinges.

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Offline Cactus

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Re: Ripmax Easy Street quick review
« Reply #12 on: May 04, 2006, 18:15:22 PM »
like i said, poor hardware.

didn't think about the hinges, just wanted it done.
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Offline Cactus

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Re: Ripmax Easy Street quick review
« Reply #13 on: May 05, 2006, 21:59:45 PM »
AUW 1lb 12oz or 790g

the vibration was my ali prop adaptor.
the hole seems slightly bigger, not helped by sitting further out than when it was on the MJ.
i drilled up another one from the standard 400 size shaft and fitted that.
perfect.

so now my 5.5x4.5 must be too much for it.
instructions only meantion a 5x3, the MJ was great on a 5x5, i want more thrust so i'll try the 6x4 but i expect it's too much for it.
5x4 maybe.

next job replace the pushrods.
i'll see if i can remove the old outers and fit the yellow snakes, if not i'll look to get some propper piano wire.
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Offline PDR

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Re: Ripmax Easy Street quick review
« Reply #14 on: May 06, 2006, 14:18:00 PM »
Yellow snakes (golden rods) will be much too big for it - you won't get them in. I used the PTFE ones where the outer tube is 3mm OD and the inner is also a tube that you can (optionally) stiffen up by running 20swg piano wire down it.

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Offline Cactus

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Re: Ripmax Easy Street quick review
« Reply #15 on: May 06, 2006, 14:33:15 PM »
could have done with those but i've not seen them around here.

what i've done is use the already fitted outers and the inner solid bit of the yellow snakes.
the hinges however are so stiff that i've had to glue on some outer at the rear to stiffen the snake up.
i've also glued outer as guides inside to stop flex.
i now have all the slop free movement i need.
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Offline Cactus

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Re: Ripmax Easy Street quick review
« Reply #16 on: July 06, 2006, 22:14:42 PM »
i got some new motive power at Woodsprings from RCMDirect :af

a A2409-12T 1570KV Outrunner and suitable speedo.
i was also given the adaptor and a 9x6 prop all at a corking price. :)
it all went in pretty easy, my slots for the screws needed to be opened out but that was the most work over.

with the speedo set up and singing  ::) i gave it a blast.
it pulled vert ok but i felt the motor and cells were a little warm for such a short burst, a quick look on the RCM Direct site shows a 8x4 - 9x4 tho Sanjeel assures me it'll swing a 10x5.

anyway with my 2200 pack I'd rather draw 20A so on went a APC 8x4 and a garden burst showed all to ok.


i managed to get out for a test tonight and it went away ok, maybe not the right prop yet but it was going around well.

that was until i heard a slight vibration that quickly got worse, next second the nose explodes and the Li-po jumps ship.
flick spinning it came down on the patch.

the nose is trash but should able to make another but the worse damage is the motor shaft, it's bent 45 degrees, not sure if this was the cause of the explosion ( precession effect ) or the result of the crash.
the motor screws are bent and they've marked the adaptor, i would have thought the impact would rip the mount out not do that.

either way I've got a bent shaft. :'(


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 GrumpyGnome

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Re: Ripmax Easy Street quick review
« Reply #17 on: July 07, 2006, 06:13:08 AM »
Bummer.  Without the cells in, I wouldn't have thought it'd be heavy enough to have made such a bend on impact.  Unless it was onto concrete of course !  Or the shaft is really a cheesy string painted silver. 

Hope you get it in the air soon and continue the 'review'.  I have an unbuilt kit (not the ARF version) that I plan on putting my Mega 16/15 and 3S Lipos in................... The build might come closer to the top of the list now I've bent my Slinger  :(

GG

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Re: Ripmax Easy Street quick review
« Reply #18 on: July 07, 2006, 10:46:17 AM »
It could have been the whole front bulkhead parting company from the fuselage. That's what happened to mine - post-crash investigation showed that the bulkhead was basicly held on by the film covering.

PDR
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Re: Ripmax Easy Street quick review
« Reply #19 on: July 07, 2006, 12:48:14 PM »
Bad luck :(

I'd say that PDR is probably right and the whole mount probably broke up in flight.

As regards bending shafts a prop gives a pretty big lever to bend a shaft if it's still on there. I've bend a 6mm shaft just like that one, on a gearbox, with a 12x8 Master Airscrew wooden prop, with no damage to the prop at all. Some shafts do seem to be almost like toffee when it comes to bending them, but it's surprising the forces that can be generated with the leverage of that prop.
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Offline Cactus

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Re: Ripmax Easy Street quick review
« Reply #20 on: July 07, 2006, 21:18:24 PM »
i did go round the mount again with cyno after Pete flagged it earlier.

it's the speed of impact with the spin slowing it that makes me think it did this in flight.
the pic shows the shaft with it pulled out, there was a tiny gap between front collet and prop adaptor, it's also slightly bent behind the collet.

i did notice before that bell didn't sit evenly, not bad but not perfect.
this was after the thing vibrated like hell on a test without the prop.
the reason being unknown to me before the spin up is the front housing has two grub screws inside at 90 degrees to each other.
this clamping meathod pushes the bearing very slightly to one side and explained the slight wobble.

however at the spinner the prescession effect looked to be acceptable.


as for forces, the APC 8x4 survived without even any whiting near the root.
belly landers will pop a similar 9x7 for a past time with no further damage so the force needed to break a blade can't be much.
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Re: Ripmax Easy Street quick review
« Reply #21 on: July 11, 2006, 21:31:11 PM »
I've been having a look at the adaptor, see what you think..



this is why i think it happened in the air.

theres 3 scores, one small one near the base then the two big ones.

how would the crash cause this? the battery's out the props stopped and even so 3?

i think the precession effect threw the prop to the side as it did it hit a screw causing the first scratch, it then managed another turn hitting both screws causing the other two deep scratches.
the pressure on them from this bent them inwards.

the vibration has since scared the li-po into jumping out.

thinking about it, theres also a circular line around the front of the mount i failed to explain, had it been on the inside you'd say it was a crush from a can motor.
but it's on the outside.

the edge of the adaptor maybe?

I'll grab a pic of that later.
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Re: Ripmax Easy Street quick review
« Reply #22 on: July 11, 2006, 22:12:47 PM »
heres the mount


sure looks like the edge of the adaptor as it runs right past the screws.
weird it's an oval shape.



anyway, doesn't matter how, shafts bent, new one should be enough.

next time i'll make sure theres no shaft wobble at all. i didn't think this was much but i was proved wrong.
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.

 

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