|Sep 25, 2003, 06:23 PM|
Help us get a SPAD flying on e-power
We SPAD'ers over at spadworld.net are looking for some help with getting a SPA3D electrified.
Here's a link to the plans for the plane: http://www.spadtothebone.com/SPAD/SPA3D
Thread for the project at spadworld: http://spadworld.net/viewtopic.php?t=5035
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!
p.s. here is link to some great video of the SPA3D in action: http://spadworld.net/viewtopic.php?t=4966
|Sep 28, 2003, 02:35 AM|
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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