Crazy Question

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Postby Guest » Thu Aug 11, 2005 3:27 pm

What RPMs do your engines turn Ray ?
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Postby gdewsbury » Thu Aug 11, 2005 8:59 pm

Solder top.
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Postby Guest » Thu Aug 11, 2005 9:27 pm

gdewsbury @ Aug 11 2005, 08:59 PM wrote: Solder top.


Probably a good idea to swap over to post type. Ones from Wildfire come with crimp-on eyelets for the wires.
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Postby rayjb60 » Fri Aug 12, 2005 3:51 pm

I get good RPMs on the Rotax185's with K&N Filters

Left Engine 5770 rpm static and 5840 rpm in the air at 3000 ASL
Right Engine 5860 rpm static

I have not be able to equalize the 90 rpm difference, so I have to sync up with the left engine.

Maybe a high end limit screw would be nice.
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Postby Guest » Sat Aug 13, 2005 2:39 pm

Are those rpm numbers with the P-tip props ?
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Postby Guest » Sun Aug 14, 2005 1:52 pm

Can't be P-Tips...bet they are Bi-Props...right?
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Postby Guest » Sun Aug 14, 2005 2:30 pm

rayjb60 @ Aug 12 2005, 03:51 PM wrote: I get good RPMs on the Rotax185's with K&N Filters

Left Engine 5770 rpm static and 5840 rpm in the air at 3000 ASL
Right Engine 5860 rpm static

I have not be able to equalize the 90 rpm difference, so I have to sync up with the left engine.

Maybe a high end limit screw would be nice.


Fairly good numbers even with filters. You probably just need to adjust the carb on the slower running engine ? As evidenced by the rpm numbers you are running carbon bi-props. Any plans to switch to P-tips for a gain of 15-20% thrust ??
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Postby russell » Wed Aug 17, 2005 10:24 am

In the early days with the pioneers, sling seat and bicycle wheels the fuel PRIMER BULBS would decide whether or not you would do a dead stick landing.
R. Rewis
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Postby rayjb60 » Wed Aug 17, 2005 6:23 pm

Yes, I am running the 26" carbon Bi-props.

The P-Tips seem very nice but I am concerned about what they might do to the crank shaft and bearings due to the extra mass, and momentum.

I have heard of several cases of crank failure with bigger props.....any truth to that with the P-Tips?

I did try adjusting the carb high end screw and still had the rpm difference.

maybe one of my carb jets is restricted somehow....dirt or simply a smaller size....airleak?. I do notice that one engine is harder to prime by turning over the prop against its compression.

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Postby Shannon » Mon Aug 22, 2005 7:49 pm

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