Prop for 25cc gasser??? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-12-2008, 05:43 PM   #1
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Prop for 25cc gasser???

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What props are you guys using for a 25cc gasser.
I'm trying to find a good prop for my Roto25 on my Maxair Velox, but I hate wasting $$$ buy a bunch of props that might get used once.

So what are you guys using on similar setups?

Thx in advance for your feed back.
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Old 07-12-2008, 11:27 PM   #2
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Re: Prop for 25cc gasser???

How about a 16x8 or 17x8? Thats what's recommended for my 26cc. Ok power with the 16x8, but not-so-great vertical on a 10lb plane. Trying a 17x8 next.
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Old 07-13-2008, 07:15 AM   #3
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Re: Prop for 25cc gasser???

RCS reccomend a 16x8 or 18x8 .

Roto engines are smooth,easy to start,and finely engineered but are not particularly high performance units so a lot depends on the model and its weight and your expectations.
Some props move more air than others ex I like Mike Clemmens props but they are thicker through the hub than some ,move a lot of air and are quieter than most.
Cheaper props like Zinger for example flex more and are noiser and harder to balance.
I would start with a 16x8 particularly if you are using the stock steel muffler which is very quiet but somewhat restrictive if experience with my two ROTO 35cc engines means anything.
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Old 07-13-2008, 08:53 AM   #4
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Re: Prop for 25cc gasser???

for an aerobatic plane and 25cc engine, I would try an 18x6. 18x8 might be too much prop, and 16x8 will run fine but you should get more thrust (with less top speed) turning the 18x6.

IN the end you are still best to try at least a few props in the air and see what ends up being the best.

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Old 07-14-2008, 04:10 PM   #5
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Re: Prop for 25cc gasser???

Thanks for the feedback guys. I've gone ahead and picked up a few props to try...
Bambula - 16x8 (wood)
JXF - 18x6 (wood)
MA Scimitar - 17x8 (wood)
APC - 17x6 (composite)

These are the best choices I could come up with between the three big RC hobby shops in Calgary (at least the only 3 that I'm aware of). Hopefully one of these will be 'THE' prop for my setup.
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Old 07-15-2008, 03:43 PM   #6
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Re: Prop for 25cc gasser???

I think the key factor for power is to go up in diameter and down in pitch.

I'll bet you the 17" X 6 will be "THE" prop that gives the best performance!!

Thats what I am using on my Zenoah G26 and worked the best for me!
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