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Electric motor for SPAD SPADET-40

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Old 05-14-2004, 07:16 AM
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henk
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Default Electric motor for SPAD SPADET-40

Hey All, I'm thinking of building a spadet-40 off the spad home page. I like the size and look of the plane, but I would like to fly electric. Any recomendations on an elecric set up that would work for this size plane? I would like to get at least 10 min flight time. Any input would be very helpful. Thanks.

H.
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Old 05-14-2004, 01:15 PM
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Greg Covey
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Default RE: Electric motor for SPAD SPADET-40

Hi,

If this is the plane you're refering to, then simply copy my AXI 4120/14 setup on my Hobby Lobby Skylark thread in this forum.

You can use the [link=http://PM22002]http://www.hobby-lobby.com/motormt.htm#AXI1[/link] Radial Mount Set without any PVC offset coupler. Additionally, to simplify setup, use the newer [link=http://www.hobby-lobby.com/jetiblue.htm]JESA40[/link] Jeti Advance 40amp controller with built-in BEC up to 16-cells NiCd or 4s LiPo.

Use an APC 14x10 or 15x8 e-prop.

Good luck!
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Old 05-14-2004, 01:57 PM
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Matt Kirsch
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Default RE: Electric motor for SPAD SPADET-40

I'm not familiar with the construction of the SPADet is in general, but you can eliminate a lot of weight by using 2mil Coroplast for the top surface of the wing, and using a folded Coroplast tube instead of gutter pipe for the fuselage. Using these techniques, my Coro-trainer weighs about the same as a standard balsa trainer.

One of my next projects is to fold up a slightly smaller version of my own-design Coro-trainer and put a 400 Watt system on it.
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Old 05-15-2004, 10:46 AM
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Default RE: Electric motor for SPAD SPADET-40

Greg and Matt, thanks for the info. Here's the link to the spadet. H.



http://www.spadtothebone.com/SPAD/Spadet/
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Old 05-17-2004, 08:41 PM
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Default RE: Electric motor for SPAD SPADET-40

I'm finishing my first electric spadet- 70 % reduced from original plan-. wing span :50 " wing area:400 sq inch and weight: less than 3
pounds. All 2.4 mm coroplast. Instead the gutter pipe I use foam 2 1/4" block (2 pieces).
My power setup is : Trinity Speed Gems 12 turns(ferrite r/c car motor) w/ Master Airscrew gearbox 3:1 ,10x6 prop and 6 or 7 Sanyo Nicd SubC cells.


The only reference that I've is Motocalc :

Gear Ratio = 3.50Diam (in) = 10.0Pitch (in) = 6.0 NC = 6
Weight (oz) = 48.5
Batt Amps = 31.6Motor Amps = 31.6Motor Volts = 6.4
Input (W) = 201.2InPLd (W/lb) = 66.3Loss (W) = 55.4
MGbOut (W) = 145.9OutPLd (W/lb) = 48.1MotGb Ef(%) = 72.5Shaft Ef(%) = 64.1
Motor RPM = 27428Prop RPM = 7836
Thrust (oz) = 30.1PSpd (mph) = 44.5RofC (fpm) = 644
Time (m:s) = 3:13

The static pitch speed (45mph) is within the range of approximately 2.5 to 3 times the model's stall speed (18mph), which is considered ideal for good performance.
With a wing loading of 15.5oz/sq.ft, a model of this size will have trainer-like flying characteristics. It would make an ideal trainer, for use in calm to light wind conditions.
The static thrust (30.1oz) to weight (48.5oz) ratio is 0.62:1, which will result in short take-off runs, and no difficulty taking off from grass surfaces (assuming sufficiently large wheels).
At the best lift-to-drag ratio airspeed, the excess-thrust (14.7oz) to weight (48.5oz) ratio is 0.3:1, which will give strong climbs and rapid acceleration. This model will most likely readily loop from level flight, and have sufficient in-flight thrust for many aerobatic maneuvers.

Any input would be very helpful. Thanks.
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Old 05-17-2004, 09:06 PM
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Default RE: Electric motor for SPAD SPADET-40

And with 6 Sanyo 2400 Nicd SubC cells, 9x6 prop, 3.5 gearbox:

Weight (oz) = 54.2
Batt Amps = 25.5 Motor Amps = 25.5 Motor Volts = 6.6
Input (W) = 168.5 InPLd (W/lb) = 49.7 Loss (W) = 43.0 MGbOut (W) = 125.5 OutPLd (W/lb) = 37.0
MotGb Ef(%) = 74.5 Shaft Ef(%) = 68.5
Motor RPM = 30022 Prop RPM = 8578
Thrust (oz) = 23.4 PSpd (mph) = 48.7 RofC (fpm) = 409
Time (m:s) = 5:53 and to level flight and throtle 80%: 10 min
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