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Prop Question

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Old 03-19-2009, 11:34 AM
  #1
bzinfinity
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Default Prop Question

The Hobby Store here has a small selection of props - and I am not smart enough where prop math is concerned to figure out if I can make my plane work with the selection they have.

The Pulse 25 XT Manual w/Power 32 calls for a 13x6.5e APC.

The shop here has a 12x8e but no 13's.

What is the difference in performance on a Power 32 with a 12x8 vs a 13x6.5e?

Thanks!
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Old 03-20-2009, 11:57 AM
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Default RE: Prop Question

11/7 to 14/ You should be OK
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Old 04-17-2009, 03:06 AM
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Default RE: Prop Question

Diameter/Pitch is order on prop numbers. 13x6.5 will have slightly more thrust because of the extra inch of diameter (better climbing, easier loops, easier stall recovery, etc). The pitch gives the plane it's speed (assuming there's enough thrust for the airframe weight and drag!) That 12x8 will make the plane fly a lot faster (extra 1.5" of pitch).

Don't be afraid to experiment with props. Esp on electric. You can prop up or down all you want, it will simply draw more power from your batts/esc. For every inch of diameter you gain/lose, you need to do the reverse of on the pitch to maintain roughly the same amp draw. Sometimes I'll prop up hugely depending on what I feel like for the day. More watts = more fun! haha


Hope this helps,
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