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HomeAircraftFixed-WingMain Discussion › Going Electric on a Plank
01-11-2011 06:52 PM  7 years agoPost 1
MattJen

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UK

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Hi Guys

as i have been flying turbines for a while now, i dont use nitro anymore,
and my 11 year old son wants to learn to fly a plank,
so i dusted off my old limbo dancer ( like a cougar) and decided to switch it to electric.

as this is a small fun fly about 30 size, does anyone know what size motor and speed controller i would need, ideally i would want to run the same lypos i use on the tex 450, 3 cell 2500.

many thanks for any help

matt

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01-11-2011 08:28 PM  7 years agoPost 2
mmc205

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PA - USA

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post the wingspan, all up weight and desired performance

for trainer like performance using an outrunner, i'd shoot for 80 watts/lb

sport, 125 watts/lb
high performance, 150-175 watts/lb
all out performance (snappy pullout from a hover) 200+ watts/lb

if its 2 pounds or so

2*200=400 watts full throttle for great performance,
400/11.1v = 36 amps full throttle
36 amps at 20C would be a 1800mah 3 cell lipo, giving you 6 minutes at full throttle, probably 10-12 minutes crusing

for a sport plane size the prop for 1-1.5:1 thrust to weight, 2:1 for 3d, about 20% more pitch speed than your expected max speed on either for a reasonable airframe.

use this to do motor calcs

http://adamone.rchomepage.com/calc_motor.htm

***Logo 600 vbar***Henseleit TDR vbar***

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01-11-2011 09:09 PM  7 years agoPost 3
MattJen

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UK

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HI MM

Thanks for the info,
here is the specs,

Wing Span: 51"
Wing Chord: 14.3/4"
Wing Area: 750 sq.in. (5.2 sq.ft.)
Wing Loading: 11oz/sq.ft.
Fuselage Length: 41.1/2"
Tailplane Span: 18"
Tailplane Area: 144 sq. in. (1 sq.ft.)
Side & Down Thrust: 0'
C of G From L.E.: 3.1/4"
All Up Weight: 3.1/2 lb (56 oz)

I am currently using a os 46, with a 10/6 prop,

I want to go to electric, there is someone in my club who uses a very similar aircraft, and the only numbers we could see on his electric engine was 35/48, but we could not make out the power..

I am not doing any wild aerobatics on it, just the occasional loop roll inverted flight, but it is mainly for basic flying skills..

So any help you can offer would be great,
thanks again
Matt

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01-11-2011 10:43 PM  7 years agoPost 4
SuperSixTwo

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Virginia City, NV ---USA

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I would use the monster power 32 with a 12/8 prop and a 45 amp esc.
I used the same motor with a 70amp align esc and a 5s lipo. the 5s5000 gives me 12 minutes with a good saftey margin. BTW the plane weight 7.5 lbs ready to go! (Its a 46 sized wood kit trainer.)

sorry for the smallness...dunno why i came out that way.

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01-12-2011 06:37 PM  7 years agoPost 5
MattJen

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UK

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thanx
super six,

i will look at getting one today

matt

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