High Pitch Electric Props

[Sail 'n Soar]

Does anyone have experience using higher pitch props such as the APC 10x10 or 11x10? The Aveox Virtual Test Stand indicates pretty poor static thrust, compared to much lower pitch props of similar diameter. I assume that is because the props must be stalled with 0 flight speed. But I would think things would improve at flying speeds with a slower thrust fall-off as speed increases than would occur with a lower pitch prop. Using a 2.5 dividing factor, the higher pitch speeds translate into higher allowable design stall speeds as well.:confused:

[Andy W]

The Aveox numbers show thrust at pitch speed - this means thrust when the model is flying at the indicated speed. Static thrust is much higher. That said, all sqaure props (pitch is very close to diameter) have lower static thrust tham props with a lower pitch:diameter ratio, but in flight - with a suitable model (less draggy) - they work well.
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[RD Blakeslee]

I use an APC 12X10E on an Astro 010G in an FMA Razor.

Prop stall is really no problem. It occurs well below stalling speed of the airplane itself. My plane flies just fine and duration is GREAT.

[Sail 'n Soar]

I use an APC 12X10E on an Astro 010G in an FMA Razor. Interesting that you are using the 12x10E on your 010. I've ordered an Astro 020G sensorless - should be here any day - and was trying to get a prop that would give performance over a very broad speed range without excess current load at launch. How many cells are you running?

[DeaninMilwaukee]

I also used the 12x10-e on a jk aerotech zero using a kyosho atomic force 3.8:1 on 8 cp2400's.

The prop did have less static thrust than the 12x8-e, felt like maybe 10 or 20%, but it still made plenty enough to make launch easy.

The real advantage came in as speeds came up. The 12x10 started making better thrust than the 12x8 starting at around 35 mph or so and pulled it to a top speed roughly 15 mph faster.

[RD Blakeslee]

8 RRC 1000 NiMH for zip, or 6 1700AAU NiMH for duration.

I'm waiting on a pair of Kokam 3270 LiPolys from FMA, for extreme duration (See "Kokam" thread, "Modelling Science").