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Old Feb 26, 2006, 07:42 AM
Destroyer of Cell's!!!
nasa_steve's Avatar
matfield,tonbridge, kent,england
Joined May 2001
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Converting Vmar Piper Tomahawk

hi all
i have just aquired a vmar piper tomahawk from a friend and i would like to convert it to electric has anyone already done one and what were your results what power train etc.
also for those in the know about converting here's the stats from the box.

span 77" or 1955mm
area 670sq in or 43dmsq
length 51.5" or 1310mm
wieght 7.5-8lbs or 3.4-3.7kg

many thanks in advance i have'nt bought any motor or the ESC yet but i do have a 4000mah 5s2p lipo pack capable of 80amp bursts that id' like to use
regards
nasa_steve
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Old Feb 26, 2006, 09:54 AM
Xtreme Nut
Kuala Lumpur, Malaysia
Joined Oct 2005
2,046 Posts
For the weight you may get away with an AXI 2826/12 best to go with an AXI 4120. A UK EP mag showed a VMAR Aerosubaru of 3.2 kgs running on the AXI 2826/12 with 12 x 3,000 mAh KAN cells turning an APC 12x6E
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Old Feb 27, 2006, 11:50 AM
Destroyer of Cell's!!!
nasa_steve's Avatar
matfield,tonbridge, kent,england
Joined May 2001
363 Posts
cheers tianci
i do have an AXI 4120/14 powering a pattern ship at the moment so i do have some experience with the big AXI's shown below
regards
nasa
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Last edited by nasa_steve; Feb 27, 2006 at 11:52 AM. Reason: add photo
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Old Feb 27, 2006, 12:02 PM
Is it summer yet?
gouda's Avatar
Flight Level 46 X 92
Joined Feb 2002
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That's a good sized plane without much wing area. I'd suggest going up to a E-Flite Power 60 or a Axi 4130. In a plane like a Cub you could get away with a 4120. I'm building a CG Cub with a 4120 and everything indicates it will have plently of power, but it has about 750 sq in. I don't know if you can get the E-Flite motors, but they are a good buy in my opinion. Good support and they come with everything needed, no other item to buy. Actually weighting all the plane bits is always a good place to start. Then you can estimate the RTF weight fairly closely. That helps I believe.
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Old Feb 28, 2006, 01:24 AM
Destroyer of Cell's!!!
nasa_steve's Avatar
matfield,tonbridge, kent,england
Joined May 2001
363 Posts
gouda
there is no way i'd be taking the 4120 out of my pattern ship on account of a piper tomahawk the 4120 stay's where it is the twister flies so well on that power plant.i do have some connections in the modelling industry so i will be making a few phone calls over the coming weeks i thought minimum would need to be approaching 1kw
regards
nasa
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Old Mar 04, 2006, 11:15 AM
Xtreme Nut
Kuala Lumpur, Malaysia
Joined Oct 2005
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Steve - I am also just moving into EP for glow planes. Got none up yet but will soon. Been reading up a lot getting data, I do not trust all this MotorCalc ... best to get it off people who have done it. I got the 4130/16 for my FL Extra 330, 4120/18 (maybe a Kyosho CAP 232), AXI 2826/12 for my WM Skyraider Mach II (will be m first glow plane to go EP) and next week my Orbit 25-18 is coming. Lipoly batts are getting cheap now so its much more affordable. I hope to go with something like the AXI 53** by the end of the year, so its time to collect more cans and paper!

Any chance of seeing pics of how you set up the motor and batts in your Twister? Thanks!
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Old Mar 04, 2006, 11:27 AM
Is it summer yet?
gouda's Avatar
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nasa; I don't think I was suggesting taking the motor out of your existing plane. I was stating that I didn't think the 4120 would be enough anyway. According to the info that came with my E-Flite Power 60 it is a 1200 watt motor (max I assume).
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Old Mar 05, 2006, 11:25 AM
Destroyer of Cell's!!!
nasa_steve's Avatar
matfield,tonbridge, kent,england
Joined May 2001
363 Posts
hi all
well firstly the Tomahawk conversion has been scratched and i am now converting a YT INTERNATIONAL HURRICANE i might start a build thread at some point!!!
tIANci........i'm afraid i have no in build photo's of the Twister i did take loads for a while but i ended up with so many "in-build" photo's on my pc it slowed it down no end. all i can say is that the cells are shown below these fit in the fuselage between the front of the wing and the firewall. and the motor is mounted radially on a 4mm ply box that is bolted to the firewall this i've used in all conversions i've done. but as i've said this is by far the most successful to date.
gouda as far as i can see the E-FLIGHT 60 is 1200w max i would certainly not push it any more than that and on top of that i can't seem to find a dealer who keeps these motors on the shelf in the UK. plus i have a dealer in the UK that i fly for so i should use his motors in anything i do really.
regards
nasa
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Old Mar 06, 2006, 03:50 AM
Xtreme Nut
Kuala Lumpur, Malaysia
Joined Oct 2005
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Steve - RWT batts ... how are they? Its cheap here in Malaysia and I think they are made locally. There are also some new so called 20C batts from China, I got a pair to test out, only USD42 for a 3S1P 1,700 mAh.
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Old Mar 06, 2006, 12:10 PM
Destroyer of Cell's!!!
nasa_steve's Avatar
matfield,tonbridge, kent,england
Joined May 2001
363 Posts
ian
the KWT cells are awsome (also labelled AIRPOWER)i'm getting 2200mah out of labelled 2000mahs they are just about some of the best cells i've used and cheap to. they say 18c i'm pulling 50amps WOT out of 52 2p and getting 13mins flight times with still some to spare.
regards
nasa
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Old Mar 06, 2006, 07:00 PM
Xtreme Nut
Kuala Lumpur, Malaysia
Joined Oct 2005
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Steve - if you put in 2,200 when it states 2,000 then it is possibly one of those manufacturers who under declare the capacity to bump up the Cs. Since you say you can pull 50A and its ok means the battery must be good enough. In Malaysia they are really cheap and I did not try it as it was sold with no mention of the Cs.
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