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Prop Question

Old 10-31-2010, 02:51 PM
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Default Prop Question

Ok, just building something out of scraps, and looking for some speed.

Using an older E-Flight Park 400 920kv motor and have 3 batteries:

2 - 3 cell 730 mah lipo battery
1 - 3 cell 1000 mah lipo battery (this is quite a bit bigger than the other two)

This is going to be small (approx 150 square inch wing), clean, and light plane.

What would be the heaviest pitch prop you would recommend on this setup (my ESC is rated at 25amps).

Also, are HS-50 servos enough, or should I go to to HS-85's (Elevator and Aileron).

Its going to be a light setup, and I want to see how fast I can go. I am scratch building the plane.

any advice would be appreciated.

Thanks,
Old 10-31-2010, 08:55 PM
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Default RE: Prop Question

The motor is only rated for 10A cont., so I reckon a 9x5 GWS HD might be a good place to start.

Motor: E-Flite Park 400 Outrunner 920KV; 920rpm/V; 0.7A no-load; 0.1 Ohms.
Battery: Thunder Power TP730 (G4 ProLite 20C) (20C); 3 cells; 730mAh @ 3.7V; 0.081 Ohms/cell.
Speed Control: Castle Creations Phoenix 25; 0.0065 Ohms; High rate.
Drive System: Direct; 9x5 (Pconst=1.07; Tconst=1) direct drive.
Airframe: Anything you want.
Motor Amps = 7.9
Motor Volts = 9.1
Input (W) = 72.1
Prop RPM = 7602
Thrust (oz) = 15.9
PSpd (mph) = 36.0

Old 10-31-2010, 09:10 PM
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Default RE: Prop Question

How bout a 1/2a Rivets to put around the motor. [8D]
Old 11-01-2010, 05:59 AM
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Default RE: Prop Question

I'm scratch building a tiny hotliner type plane, like a mini F5D plane. Wing and tail feathers are done, waiting on the body, a 5/8" o'd Carbon tube.
Old 11-01-2010, 11:25 AM
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Default RE: Prop Question

Oh, a hotliner... then try this: you really are handicapped by the low Kv... for speed you'd need a 4s pack and maybe a 6.5x6.5.

Motor: E-Flite Park 400 Outrunner 920KV; 920rpm/V; 0.7A no-load; 0.1 Ohms.
Battery: Thunder Power TP910 (G4 ProLite 20C) (20C); 3 cells; 910mAh @ 3.7V; 0.061 Ohms/cell.
Speed Control: Castle Creations Phoenix 25; 0.0065 Ohms; High rate.
Drive System: Direct; 8x8 (Pconst=1.47; Tconst=1) direct drive.
Airframe: Anything you want.
Motor Amps = 10.0
Motor Volts = 9.2
Input (W) = 92.4
Prop RPM = 7396
Thrust (oz) = 14.5
PSpd (mph) = 56.0


Motor: E-Flite Park 400 Outrunner 920KV; 920rpm/V; 0.7A no-load; 0.1 Ohms.
Battery: Thunder Power TP1250 (G4 ProPower 45C) (45C); 4 cells; 1250mAh @ 3.7V; 0.009 Ohms/cell.
Speed Control: Castle Creations Phoenix 10; 0.0013 Ohms; High rate.
Drive System: Direct; 6.5x6.5 (Pconst=1.47; Tconst=1) direct drive.
Airframe: Anything you want.
Motor Amps = 9.7
Motor Volts = 14.4
Input (W) = 140.6
Prop RPM = 12219
Thrust (oz) = 17.2
PSpd (mph) = 75.2

Old 11-01-2010, 12:48 PM
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Default RE: Prop Question

Thanks for running those, 75 mph would be quick for a plane of this size. I attached a pic of where I'm at. The fuse will be the carbon tube which is about 1/4" in diameter, might be a hair bigger, but roughly that size. Will glue 1/4" tri stock to the wing and tail that will snug up to the carbon tube. Gluing this together and getting the incidence 0/0/0 should be a piece of cake doing it on a flat surface.

I am gluing a hardwood dowel inside the tube to have a hard point to mount my motor. Tail and wing and 1/4" slab balsa (light stuff), there is a 1/4" wide hardwood spar, which is capped with .007 carbon laminate, top and bottom. The tail, wing and vertical, all have 1/4" wide 1/64" ply embedded in the edges so they are all sanded to a relatively sharp point all the way around.

Was hoping to put the elevator linkage in the CF tube, but I don't think so..

I attached a pic of what I normally fly, so I'm not concerned about the speed.
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Old 11-01-2010, 07:27 PM
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Default RE: Prop Question

After some thought, decided to go to a v-tail. I think I like the look better, but took away some of the simplicity.
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Old 11-14-2010, 11:33 PM
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Default RE: Prop Question

A little progress...

Calling it the Electric Slide

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