K&B 7.5 DF prop
04-01-2003, 06:05 PM
#1
K&B 7.5 DF prop
I have a k&b 7.5 cc df engine that I am putting on a Whiplash. What do y'all think is best for this combo. Also, what pipe length with that associated prop. While in the fan, I turned the motor 24,500 peak and flew at 23,500. I doubt if I will get a prop to turn quite that fast and still have enough low end grunt to get the plane flying from the hand launch.
any help would be appreciated!
any help would be appreciated!
04-03-2003, 01:04 PM
#2
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K&B 7.5 DF prop
Jeff,
You want to keep the R's up on that engine. I have one on my Dust and it turns over 21k on the ground. Launching isn't a problem with the Dust. For the Whiplash you will want someone to hold the plane overhead and gently push it forward and level. Once the plane is trimmed you can go with the Frisbee type launch.
A good starting prop should be in the 8x8, 8x9 range.
Mark M.
You want to keep the R's up on that engine. I have one on my Dust and it turns over 21k on the ground. Launching isn't a problem with the Dust. For the Whiplash you will want someone to hold the plane overhead and gently push it forward and level. Once the plane is trimmed you can go with the Frisbee type launch.
A good starting prop should be in the 8x8, 8x9 range.
Mark M.
