carlisle
Joined: 20 Jun 2009
Posts: 72
Location: Sioux Falls, SD
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 Posted: Fri Oct 09, 2009 10:13 am Post subject: coolant plumbing/Initial VG tests |
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On my model 2, there's a right angle fitting that joins where the coolant hose exits the underside of the cowling and heads back for the radiator. I've always used gray high temp PVC to accomplish this but have lingering doubts about it's tolerance to the higher temps, especially in summer time, and am unable to come up with any hard data on this. In any case, I'd like to switch to aluminum or possibly brass fittings for peace of mind. Does anyone know a good source for these. Local hardware stores just furrow their brow when I look there, even if it's a plumbing specialty store.
Also, I installed my Stolspeed VG's and have flown since (see thread on tuft testing of upper wing surface) and the results are interesting. Stall appears to be down to around 30 mph vs 35 without, and is more abrupt. Prior to VG's, stall was really just a mush with pitch attitude oscillating up and down maybe 10 degrees or so at about 4000 rpm. Now, there's a little warning 1 or 2 mph before and a very definite but also controllable break with the nose dropping to maybe 20 deg pitch down and no tendency to roll. Altitude loss is no more than 100 ft and recovery is immediate.
Pics and vids to follow.
Chris Carlisle
Model 2, 582
Sioux Falls, SD
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