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Old Mar 11, 2005, 10:58 AM
RETIRED PHILLY FIREFIGHTER
Vagabond324's Avatar
Philadelphia, PA USA
Joined May 2004
297 Posts
My 2nd. electric aircraft. help needed

I am working on an ARf that has very poor instructions and I am tring to figure out what Power system to put in it that would work the best.

The airframe is a pusher configuration called a Sky Arrow by Hacker. The max prop size appears to be about 6 inches. The box states the following

Motor : 280 to 400 size motor.
WS : 1080mm (41 11/16)
Length: 780mm (30 11/16)
Weight 400-500g I believe this is around 14 to 17.5 oz.

I want to fly this aircraft with floats later on so I need the most power possible. I'm sure this weight is without any electronics installed like servos or reciever. I plan on using a Hitec 555, 3 HS-51 servos as well as the appropiate CC speed controller, I would also like to use Li-po batteries to get the best power for the lowest weight. I would like to hear what would be a good motor, battery, speed controller configuration for this. Also are there better receivers available that would reduce the weight. Thanks in advance for your help. Jon
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Old Mar 11, 2005, 01:30 PM
WAA pilot #21
Vanning's Avatar
Princeton NJ
Joined Dec 2003
3,166 Posts
This one?
http://www.ilmailuliitto.fi/shop/hacskyarr.html

from the weight & the size, id say a GWS 350c-C motor & gearbox, a 0970 prop, CCpixie 20 speedo and 2cells ~1500mah lipo

Stick a Himax 2025-5200 brushless motor in the above gearbox and a CC pheonix25 speedo for a kick in the pants.

wait- it looks like a 9" prop is too big. Ok, then use the above motors direct drive.
http://www.gws.com.tw/english/produc...em/edp300h.htm
the 0630 or 0543 prop looks good.
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Last edited by Vanning; Mar 11, 2005 at 01:38 PM.
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Old Mar 11, 2005, 01:41 PM
Registered User
vintage1's Avatar
East Anglia, UK
Joined Sep 2002
29,688 Posts
I think I would go for the maximum power possible and probably forget a gear box as it may make the mounting a bit of a pain.

LIPOS certainly and if you get 3s LIPO of about 2200 capacity, then you can either for a permax or Graupner 7.2v 400 motor, or a permax 480 'long can 400'

Gunther prop or APC 5.5x4.5 shoudl sort it all out prop wise.

Frankly I think it will only need a 400.
If money no obvject a mega 16/15/5 or thereabouts would slot on and give as much power as the 480, but weight in like the 400.
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