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August 20, 2017, 18:18:11 PM

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Author Topic: electrifying a slope soarer.  (Read 840 times)

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Online itsme

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electrifying a slope soarer.
« on: July 03, 2017, 19:18:39 PM »
Being fed up with constant windy conditions lately, I have been considering a return to the slope. Problem- I live a good long run from a decent slope. So I was wondering, why not build a slope soarer and put an electric set up in it? I have a lovely grass field club I am a member of just two miles from home. Problem- I know very little about electric. So, has it already been done, if so, how, and what sort of set up (based on 3s) would I need to have a fast climb to height to do slope style glider manoeuvres and then climb again? I was thinking one of these- ila_rendered from Stan Yeo, obviously adjusting the fuselage size to suit, with a folding prop. Is it doable? Stans models (I have built a few) fly great and are simple builds. I was even thinking of using the gear out of a defunct Wot 4 foamie but motors etc are not really expensive. Any recommendations?


Offline Phil_G

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Re: electrifying a slope soarer.
« Reply #1 on: July 03, 2017, 20:18:35 PM »
Whats a good long run Bob?  I'm 50 miles from Callow,  HOH is 60 miles, Nont Sarahs about 45. Summer Hill (Great Ayton) is about 70. All regular haunts, well worth the journey. Pack a flask & some sarnies and make a day of it.
Electric?  Pffft  :nananana:
Cheers
Phil
« Last Edit: July 03, 2017, 20:24:12 PM by Phil_G »

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Re: electrifying a slope soarer.
« Reply #2 on: July 03, 2017, 20:46:38 PM »
Whats a good long run Bob?  I'm 50 miles from Callow,  HOH is 60 miles, Nont Sarahs about 45. Summer Hill (Great Ayton) is about 70. All regular haunts, well worth the journey. Pack a flask & some sarnies and make a day of it.
Electric?  Pffft  :nananana:
Cheers
Phil
Ha ha Phil. It would be Scotsmans Pack for lunch....No, I have to accept that costs come in to it for me, but I thought that Callow was off limits now? Even that is thirty miles, when I have a lovely grass strip almost at my door. I could still go up there with this model and just remove the prop.


Offline Patmac

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Re: electrifying a slope soarer.
« Reply #3 on: July 04, 2017, 00:08:25 AM »
I fly an old Protech Unlimited on the flat in the way you describe & also occasionaly as a sloper. I got it s/h with brushed motor & nicads years ago & converted it to brushless with 3s lipo. It's about 62" span & about 38 - 40 oz RTF with 3s 1800 lipo or 3s 2200's.
Power train : Emax 2815/09 1400 kv, Graupner 9x5 folder, Hobbywing Pentium 40 ESC.  Current 29A, power 300W @ 12400rpm.

ila_rendered

Similar setup should be good in the Pzazz but the nose area would need fattening to take the motor. Probably best to design nose mods around a 40mm spinner.
Pax vobiscum

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Offline Phil_G

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Re: electrifying a slope soarer.
« Reply #4 on: July 04, 2017, 01:03:41 AM »
I thought that Callow was off limits now?
Not at all,  its important that we continue to use it, and be seen to be using it. Was there yesterday:
<a href="http://www.youtube.com/watch?v=Puytej-gw20" target="_blank">http://www.youtube.com/watch?v=Puytej-gw20</a>

Even that is thirty miles,
You're much nearer than me then Bob, and Callow is my regular haunt!
Cheers
Phil



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Re: electrifying a slope soarer.
« Reply #5 on: July 04, 2017, 06:53:05 AM »
PM sent..............
The user formerly know as Bravedan........... Well if Prince can do it....................

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Re: electrifying a slope soarer.
« Reply #6 on: July 04, 2017, 08:47:03 AM »
Patmac- thats exactly the info I was after. Does it go up quickly? I'd like a bit of upwards performance.
Phil- does Sheffield no longer control it? I heard that the tenant farmer put posts all over the landing area. Cant beat  Callow in a nice steady westerly.

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Re: electrifying a slope soarer.
« Reply #7 on: July 04, 2017, 23:45:19 PM »
Bob, the climb's pretty well vertical, get's uncomfortable to see within a 15 -  20 secs. A lower kv motor & using a bigger dia prop would climb faster for the same power. I nearly always fly it at full or closed throttle doing aeros on the glide.
If you use down elevator compensating mix with throttle it's best to set a second or so delay. I didn't first time I tried the mix, dived from altitude on the glide for a low fast pass down the strip & opened up ready the climb back up but the down elevator mix took effect before the throttle & nearly caused an embarassing nose dart manoeuver.  :embarassed: Since then I've moved the cg back to minimize the nose up on full throttle & on this model I manualy control any nose up pitching instead of using a mix.
Pax vobiscum

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Re: electrifying a slope soarer.
« Reply #8 on: July 05, 2017, 08:34:05 AM »
Scratching my head between these choices on Stans site. For the 63" slope glider I posted above. Go for the one that throws the biggest prop?


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Re: electrifying a slope soarer.
« Reply #9 on: July 05, 2017, 23:54:11 PM »
From the POV of power, weight & KV the 3542/05 is probably fine (Also it has a 5mm shaft). However all of the motors shown are set up for front mounting, meaning that there will need to be space made for the wires to avoid rubbing against the rotating case. It might be possible to reverse the shaft but it isn't always. Alternately the motor could be firewall mounted using an "X" mount with a bolt on extension used for the prop drive. Room would have to be left behind the firewall for the redundant shaft, or it could be cut away.
OTOH you could get this motor which is identical except for the shaft, the colour, the price & Overlander's BS claims. But it does include accessories.

When you choose an ESC make sure that the BEC is "switch" mode not "linear" mode.     
Pax vobiscum

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Re: electrifying a slope soarer.
« Reply #10 on: July 06, 2017, 08:19:49 AM »
From the POV of power, weight & KV the 3542/05 is probably fine (Also it has a 5mm shaft). However all of the motors shown are set up for front mounting, meaning that there will need to be space made for the wires to avoid rubbing against the rotating case. It might be possible to reverse the shaft but it isn't always. Alternately the motor could be firewall mounted using an "X" mount with a bolt on extension used for the prop drive. Room would have to be left behind the firewall for the redundant shaft, or it could be cut away.
OTOH you could get this motor which is identical except for the shaft, the colour, the price & Overlander's BS claims. But it does include accessories.

When you choose an ESC make sure that the BEC is "switch" mode not "linear" mode.     
Thats excellent Pat. (although it goes against the grain going to HK) how big an esc would I need?

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Re: electrifying a slope soarer.
« Reply #11 on: July 06, 2017, 23:21:05 PM »
Bob, I'm using a Hobbywing Pentium 40 in the Unlimited. The name had to be changed for copyright reasons but I'm pretty certain this Turnigy Plush 40 is the same with a different badge. Although the spec says it's linear BEC I'm sure all Hobbywing 40A & over ESCs are switch mode & one of the reviews mentions that it is. So long as you don't load the motor over about 35A a 40A ESC gives plenty of leeway.

Re shopping from HK, if you only intend to get a motor & ESC it's worth comparing the postage from UK against EU warehouse. It does take longer from EU but is usualy much cheaper for low weight packages, except lipos.


 
Pax vobiscum

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Re: electrifying a slope soarer.
« Reply #12 on: July 07, 2017, 00:02:14 AM »
Thanks. Not down to pennies but cheaper is always good.

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Re: electrifying a slope soarer.
« Reply #13 on: July 18, 2017, 16:17:35 PM »
Good luck with your project - it all seems to be heading in the right direction.

If space in the nose is a bit tight for the wires on an outrunner motor there is always the option of fitting an inrunner where the wires come out of the back (and there are no exposed rotating parts in the nose except the rear end of the shaft. I have several second-hand Jeti/Mega/Hacker motors which are inrunners and all have been OK. A bit less risky than buying second-hand IC motors, I think.

When you get to like this flying (and I think you will) I highly recommend an all-moulded glider - their performance is astounding. I have 2 Valenta models - Sabre hot-liner and Volcano. Like you I have a local field for electric soaring so each session I save two hours travelling/walking to the top of the hill and about  6 in diesel. Flights are usually 45 mins. to an hour with mainly soaring and a couple of aerobatic moments thrown in.

An occasional trip to the slope is still worthwhile, if only for the view.

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Re: electrifying a slope soarer.
« Reply #14 on: August 16, 2017, 10:51:30 AM »
Bob, I'm using a Hobbywing Pentium 40 in the Unlimited. The name had to be changed for copyright reasons but I'm pretty certain this Turnigy Plush 40 is the same with a different badge. Although the spec says it's linear BEC I'm sure all Hobbywing 40A & over ESCs are switch mode & one of the reviews mentions that it is. So long as you don't load the motor over about 35A a 40A ESC gives plenty of leeway.

Re shopping from HK, if you only intend to get a motor & ESC it's worth comparing the postage from UK against EU warehouse. It does take longer from EU but is usualy much cheaper for low weight packages, except lipos.
Ordered these Pat, thanks. Looking at spinners and props now-https://hobbyking.com/en_us/50mm-alloy-folding-propeller-spinner-with-4mm-5mm-6mm-shaft-adapters.html What do you think?


 

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