Originally Posted by bjdecker
Is there a snubber or restrictor installed in front of the MAP sensor — and is the MAP sensor a Kavlico P4055-30A-E4A?
What’s going on at 59” into the flight? MAP goes WAY up for quite a while…physics got suspended over Ayer’s rock?
Maybe I shouldn’t bother…
Flight started off at 5k and partial throttle due fzl.
That mysterious jump in MAP is likely due to me pushing the black lever to WOT as I climbed from 5k to 9k
Yes it’s a P4055-30A-E4A with an Omega PS-8G installed at the sensor end of the MAP line.
I should have probably just said WOT rather than specify an actual MAP. Jut grabbed the last flight at altitude I had. I don't target MAP I just fly WOT all the time unless (as in this case) Im held low for some reason. ATC or FZL. In that case I tend to target top of the green arc (which for this flight was around 24.5") at TOC it was 24.5 too.
I really can't be bothered plotting WOT MAP vs PAlt for all the flights I have - but if someone wants to script something up they are welcome to all the data. Im confident its above ambient. How much who knows.
Back to the OPs question tho - you guys have got many hundreds of tens flying around, surely some of you could get together and compare configurations.
My back of the envelope calcs suggest that my 285HP 9:1 with CAI should yield me an extra 6.5kts above the 260HP. People said I'd lose 5-6Kts because of the Hartzell 3 blade (I think that's likely to much). Turns out I'm a few knots quicker than book - so maybe the cowl/induction/larger spinner is worth a knot or two. But who knows without side by side comparisons.
Yes before anyone asks I did the NTPS PEC testing in phase 1 and its small across the range ( +0.6 at 155 KCAS ie quicker than indicated )