NOVA1

My Feedback: (1)

Hello i have a super decathlon i want to convert to Electric and im am totally new to eLectric stuff could any help me with this conversion
This Plane Has
wing span 64inches
wing area 694 sq inches
fuselage is 45 inches
weight is 6 1/2 lbs
wing loading 22 oz/sq.ft.
i downloaded motor cala but i guest i dont know how to use it
want to try to brush motor with Gear box
thank you for the help if one out there can help me

Greg Covey

To use a brushed motor on a plane that size and weight, I would recommend an [link=http://www.astroflight.com/e/env/0001UZVjjFqwY105D81K0d5/index.html?link=/index.html]Astro Flight Cobalt[/link] motor.

A good choice would be the [link=http://www.astroflight.com/e/env/0001UZVjjFqwY105D80U1N2/store/store-Cobalt.html?link=/store/store-type-tem.html&item=products:af-640s]Cobalt 40 with Superbox[/link] since it can product around 700 watts on 20 cells NiCd.

To help save some weight, you could also use two packs of 3-cell Litihium in series.

Good luck!

Matt Kirsch

My Feedback: (21)

Motocalc's not too hard to use. First, don't bother with the Wizard. It doesn't give you anything useful IMHO. Motocalc is most useful in playing with a setup to see how it should behave in the real world.

Nova1, did you mean brushED or brushLESS? If you did mean brushed, take a second look. The price difference between an Astro Cobalt 40 and an Astro Brushless 40 isn't that huge.

Good luck with that plane. If it's the one I'm thinking of (the old .40-size kit), they have a bad reputation as unflyable snots.

NOVA1

My Feedback: (1)

Matt its the same one im trying to change the wing incident i guess this the problem .i heard it had wash out problems and they said to cure the problem use big surpass 70 4 cycle ,but that dont fix problem so im going with more wing incident to try to fix it. would direct drive or gear box be better

Greg Covey

Use a gear box for a brushed motor. For a brushless motor, you can go either geared or direct drive.

jonnyjetprop

My Feedback: (3)

I was having a hard time finding the kit/arf you are talking about. I assume that the 6 1/2 pound weight is an all up glow weight. Therefore, I would expect an electric weight of about 7 lbs.

Look for 700 to 800 watts of power. Running at 40 amps, you would need a 20 volt battery. This would put you in a 6s lipo battery or a 20 cell nicad pack.

Motors that would work well in this range are:

Astroflight 40G Brushless
Geared Mega 22/30/2 or /3or/4 turn motors
AXI 4120/18
AXI 4130/16
Kontronic 600 Brushless set

Hope this helps.

John

http://www.astroflight.com/e/env/000...ducts:af-840gm

http://www.megamotorsusa.com/Brushle...30-3.htm?id=29

http://www.modelmotors.cz/index.php?id=en&nc=produkty_vypis&kategorie=m_neodym_ac&id_rady=axi_41&id_produktu=axi_4120_18&nazev_rady=Series%20AXI%2041&hmotnost_rady=(320%20-%20409%20g)

http://www.modelmotors.cz/index.php?id=en&nc=produkty_vypis&kategorie=m_neodym_ac&id_rady=axi_41&id_produktu=axi_4130_16&nazev_rady=Series%20AXI%2041&hmotnost_rady=(320%20-%20409%20g)

http://www.kontronikusa.com/sets/kong5060.html