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About Flow

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    Junior Member

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  • Location
    New Zealand
  • Interests
    Miracles Of Ordinary Nonconformists Exceeding Yardsticks
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  • Model
    WTB: 305 Rocket

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  1. Guys guys guys, great comments and the Bold method and Machado articles are a good start but this is a POF question about why a particular TN Mooney's Vy INDICATED INCREASES with altitude (the opposite of what the texts explain) I have edited the OP for emphasis. No other aircraft I know of does this. Maybe Mooney's are special, maybe just this one TN J. I understand, especially the latter Mooneys, have pretty much the best turbo installations in GA aircraft of the era so maybe they actually are. What special characteristic is it that allows them to defy the textbooks is the question. Wh
  2. Thank you, we do keep coming back to reduced exhaust back pressure due to reduced ambient pressure and therefor greater pressure drop over the turbine, cooler induction charge, and a net boost increase so at sea level you maybe getting a 6" boost above ambient while at 20,000 you are 24" above ambient or 20" if your MAP has dropped back to 32. I have added the pictures from the Pprune post to the OP above.
  3. I don't know what to say, I see that is true but why would they do that? Simplicity I guess. That puts paid to the idea that the power plant is more efficient at 20,000ft and shows why the climb rate falls away so much on a 231. Maybe with a 30" max TN style application rather than 40" it is able to hold MAP up that high with the same very leaky design. But I am still not understanding the factors in play that could generate additional additional stretch north in Vy away from unpowered (trust 0) V (AoA) min sink. TAS yes IAS, not getting it.
  4. That is interesting, thanks. What the IAS is doing here in the real world is the key, vertical speed also being a TAS.
  5. Yep thanks, aware and good article but the question is about POF not airmanship.
  6. So this comment is the closest answer? "As to why it would increase in this case maybe the power plant is more efficient as we have dramatically reduced the OAT, added ~8psi to the pressure differential over the turbine wheel and the waste gate is now closed. With a Turbo Normalized installation with automatic waste gates you should be wide open throttle the whole way up so maybe we are seeing more power dragging Vy north, but by 5% total and maybe over 10% further stretched away from min sink? Possibly?" Is there any data on TN performance increase with altitude?
  7. Hello folks, I posted this on PPrune about why a TN J seems to have its indicated Vy INCREASE (backwards from what you would expect) as it climbs. No one really seems to have cracked it. https://www.pprune.org/tech-log/633530-factors-cause-vy-increase-altitude.html So are there any Turbo drivers here that notice their best rate of climb tends to occur at a faster IAS as the get into the flight levels. That is before the wastegate shuts. If so does anyone know why this happens?
  8. Hi folks, it doesn't look like the owner is a member here. Does anyone know this aircraft per chance? https://flightaware.com/resources/registration/N252WT https://www.controller.com/listings/aircraft/for-sale/33127231/1986-mooney-m20k-305-rocket Here is a bit more context as well.
  9. Cheers! Is the owner a member here per chance?
  10. This one might do it. Does anyone know the aircraft at all? https://www.controller.com/listings/aircraft/for-sale/33127231/1986-mooney-m20k-305-rocket
  11. Hey folks does anyone know this aircraft? https://barnstormers.s3.amazonaws.com/media/docs/305KM_For_Sale_buNTTQg.pdf For New Zealand we really need the epoxy coated frame however...
  12. Full thread creep but hey it's bumping the topic! From what I have gathered from MSers. As you can see it resolves a number of issues peculiar to the Rocket at the cost of engine out glide angle ie, range and energy required to flare. - ~34lbs lighter on the nose = CoG and payload improvements. Small improvement here have large percentage gain for the Rockets. Handling, trim drag, payload, stall speed, weight on nose wheel etc, etc. - Pumps more air through the cowling for better climb cooling due to airfoil shape at root. - Noticeably better air brake allowing
  13. It is! And not to be sniffed at. It is a proper adventure and you need to be well prepared. If you limit to Part 91 and exclude helicopters... from NTSB data. 73% of ferry pilots that ditch survive the splash down and the sea survival. 87% of ditchings result in all souls saved. 93% of forced landings on land result in no fatalities though injuries including burns are a lot higher. This is Paul Bertorelli on ditchings http://www.equipped.com/ditchingmyths.htm While in Australia I tracked down Ray Clamback to talk about his 300 or so deliveries from the US to Au
  14. I do like what you have done with yours PJ, very nice.
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