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In a message dated 9/14/2003 12:44:44 AM Eastern Daylight Time, 13brv3@bellsouth.net writes:
I do agree that it's time to step back and make some well reasoned
observations, rather than taking a chainsaw to anything yet. For sure, the
cowl has to go eventually, but I really didn't want to have to do that now.
I've thought about replacing the radiator, and modifying the cowl into yet
another temporary shape, but that's a lot of work for another temporary
cowl. Thanks,
Rusty
While this may not add as much as you need, I have been looking at my dyno sheets for a bridge ported 12A. The lowest RPM tested is 6,500 RPM because best power is at 9,400 RPM and we never go below 7,800 RPM. This is for racing but here is my point. Most people are running the 13B around 6,000 RPM. Then pull back to 5,500 or more for lower fuel burn in cruise. With stock ports and pulling off power to limit boost. I think your only problem is the waste gate size. Or flow, but that is the Idea. The cowl shape, or lack of a cowl is not going to make much difference in the climb at 100 KTS. Taking out pitch, and then limiting RPM, limits excess HP required for climb. More typical would be enough pitch to stall the prop on a hot day and have to back off the power slightly to unstall it until some ground speed has built up. As a test, you could reduce cooling air inlet with some sheet stock and duct tape for a test flight, but I don't think you will see much of an improvement, because I don't think that is the problem. That big surge in acceleration you feel as the craft begins to roll should be coming half way through the take off roll. And you should be having to watch for excess RPM during take off. Once you can lay into it at WOT all the way up to 6,500, you should see at least 160HP performance or more. Lynn E. Hanover
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