Prop for Vipper (Full Version)

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BUDMAN27 -> Prop for Vipper (3/19/2008 8:36:12 PM)

I put a Jett Q-40 (older styl) not the new long stroke on a GP Vipper. At this time I have a APC Carbin 7.4x8 on it (have not flone it yet) I was just wondering what you guys thought I should use. Not planing on racing her just put it together for some fun.[;)]



BUDMAN27 -> RE: Prop for Vipper (3/19/2008 8:38:23 PM)

Sorry I allways misspell Viper when I,m in a hurry.



fizzwater2 -> RE: Prop for Vipper (3/19/2008 9:01:48 PM)

You might post this question over on the Jett factory support forum, Bob might have some inputs.




daven -> RE: Prop for Vipper (3/20/2008 3:32:11 AM)

The 7.4x8 is most likely too heavy of pitch to get it going.

Try the 7.4x7.5 and get the RPM up.



BUDMAN27 -> RE: Prop for Vipper (3/20/2008 5:15:04 AM)

Cool [;)]



HighPlains -> RE: Prop for Vipper (3/20/2008 5:15:50 AM)

Not enough diameter.



BUDMAN27 -> RE: Prop for Vipper (3/24/2008 4:56:03 AM)

I think Highplanes is right. It looks a little to little for a Viper. I beleave a 8x8 or 8x7 would look more at home on this bird.



garys -> RE: Prop for Vipper (3/24/2008 5:00:48 AM)

Then you need a different engine. A few people tried Q40 engines on Q500's around 1994-95, but they were slower than Q500 engines because of the prop.



BUDMAN27 -> RE: Prop for Vipper (3/24/2008 5:24:36 AM)

Thanks gary thats good to know. [;)]



HighPlains -> RE: Prop for Vipper (3/24/2008 5:28:06 AM)

I broke in my first Nelson Q40 engine on a quickie. It went pretty well with a 8 3/4 x 6 1/2 Rev-Up cut down to 8" diameter. You might get a 7 pitch to work. But at best, it would be down from a quickie timed engine and prop combination by about 10 mph. If there is a shim under the sleeve, removing it and adding shims to the head will help slightly.



BUDMAN27 -> RE: Prop for Vipper (3/24/2008 5:42:04 AM)

Coolbeans [;)]



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