Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Top speed Ultimate Bipe 40s saito 72

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Old 06-14-2007, 06:00 PM
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nilsreinert123
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Default Top speed Ultimate Bipe 40s saito 72

Hi!

Do anyone know how fast my WM Ultimate 40 bipe will fly with a Saito 72 engine? and what prop should i use to make it fly as fast as it can go?

Thanks.
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Old 06-14-2007, 06:52 PM
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Default RE: Top speed Ultimate Bipe 40s saito 72

Don't know an actual speed but it will go pretty fast with a 12 x 10 (N series if you can get hold of one) and 30% Nitro.

Make sure you pour lots of CA in all the joints and add some strengthening to the firewall before you fly it - they have a habit of coming apart
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Old 06-14-2007, 07:40 PM
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Default RE: Top speed Ultimate Bipe 40s saito 72

Ok , i have a 13*11 apc that i will try also. do you think that will be to much?
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Old 06-14-2007, 07:45 PM
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Default RE: Top speed Ultimate Bipe 40s saito 72

Give it a try
They are a light plane and they slip through the air pretty well so it will probably work fine.
Recommended Prop Range for the 72 is 12x8 to 14x8 with the benchmark being a 13 x 8 @9800 RPM.

Try the 13 x 11 and see what revs you get - if it is acceptable (say above 9000 rpm) and doesn't seem too loaded up, fly the plane and see how much it unloads in the air.
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Old 06-14-2007, 07:58 PM
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Default RE: Top speed Ultimate Bipe 40s saito 72

Would a os 46 ax been able to pull the plane faster? it is listed with more HP`s ,and is a two stroke. guess they`re more "angry"?
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