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Old Sep 25, 2003, 06:23 PM
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carterfx's Avatar
SF Bay Area
Joined Jan 2002
39 Posts
Help us get a SPAD flying on e-power


We SPAD'ers over at are looking for some help with getting a SPA3D electrified.

Here's a link to the plans for the plane:

Thread for the project at spadworld:

The wing is 36" x 19", empty weight is around 3lbs 11oz.

I have a copy of motocalc and I plugged the figures in but it didn't come up with anything.

Basically the plane flies super with a .47 glow engine but we'd like to know what the best power system would be for an electric version.

Any help is greatly appreciated! Thanks!

Jake Carter

p.s. here is link to some great video of the SPA3D in action:
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Last edited by carterfx; Sep 25, 2003 at 06:28 PM.
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Old Sep 28, 2003, 02:35 AM
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Larry3215's Avatar
Gig Harbor, Washington, United States
Joined Sep 2003
8,434 Posts
max prop size?

What is the biggest prop you can swing with that setup?

With a Mega 22/45/3, MEC Monster box geared 3.9/1, APC-E 20x13 prop, 18 SC 3000MAH cells, 32 Amps static (as tested on my system) - should hover for 5 plus minutes. All up weight 108 oz - thrust aprox 120 oz.

You may have structural issues tho. The motor/battery pack weighs almost as much as the entire plane. Your wing loading is going to go up a fair amount compared to a .40 gasser.

I have been flying this combo in a 130 OZ blue foam biplane. It has also flown an 11 lb all coro biplane quite well. Lots of power and the motor can handle lots more.

If you don't have the ground clearance for that big a prop you can gear for more RPM on smaller props, but it is harder to get the excess thrust from the smaller props without going to a higher cell count and/or a lot more amps. That reduces your flight times and/or increases weight.

I'm sure there are lots of other posibilities out there. Lithium batteries could save weight and give longer flight times - if budget allows. They are very spendy.

Let us know how it goes.

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Old Mar 11, 2015, 08:25 PM
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DonStegall's Avatar
United States, NC, Monroe
Joined Nov 2013
35 Posts

The Turnigy G46 would probably do great ... see
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