"nteresting. Does anyone here use "summer" and "winter" idle mixture settings?"
Back in the day, used to set the Cherokee 140s up for winter & summer idle mixture/idle RPM - Central Alberta 3,00'ASL. Pain the Butt, it was sensitive enough that we had to cowl the engine up after each adjustment. Cessna 150s and 172s with the same engine were OK. Don't remember if it was recommended by Piper or not - The Chief engineer was an extremely by the book ex-RCN type, so it's likely.
Weird Engine Failure
Moderators: lilfssister, North Shore, sky's the limit, sepia, Sulako, Right Seat Captain
Re: Weird Engine Failure
Hedley wrote:Yes, but I expect they use a "wet" system (which adds fuel as well as nitrous oxide gas) as opposed to a "dry" system which does not add gasoline, and thus runs the risk of going excessively lean at high power settings, which causes detonation, which causes you to go out and buy new rings and pistons.
Ive seen a supercup with a dry "sneaky pete" setup. I dont think you would want to run much more than 25 shot or so like this.
Rule books are paper - they will not cushion a sudden meeting of stone and metal.
— Ernest K. Gann, 'Fate is the Hunter.
— Ernest K. Gann, 'Fate is the Hunter.
Re: Weird Engine Failure
Had the engine quit twice in the Pitts and the prop sure does not stop turning even as you get near stall but its a much higher stall speed. Do recall being in a 150 with stopped engine 20+ years ago and it definitely needed to be in or near stall for many seconds to get prop to stop. Probably lots of factors affect this such as prop weight, stall speed, engine compression (old new) engine temperature, type of oil etc.For grins, I have stopped the prop a couple times in a 172 - overhead a quiet airport - and you wouldn't believe how ridiculously slow you have to get. Very close to the stall.
Re: Weird Engine Failure
Prop pitch might also affect how easy it is to stop the prop, too.
A climb prop (with fine pitch) would probably windmill the engine faster at slow airspeeds than a cruise prop, with coarse pitch. I think. Did I get that right?
Tip of the day: Don't play the slot machines, either. j/k. If you have an engine failure in a single engine airplane with a constant-speed prop, if you can't get it to restart, pull the prop control all the way back, to try to reduce your drag. It's not quite feathering the prop, like you would on a twin, but at least that says that you're trying, sort of like chocolates and flowers on the day after wifey's birthday
A climb prop (with fine pitch) would probably windmill the engine faster at slow airspeeds than a cruise prop, with coarse pitch. I think. Did I get that right?
Tip of the day: Don't play the slot machines, either. j/k. If you have an engine failure in a single engine airplane with a constant-speed prop, if you can't get it to restart, pull the prop control all the way back, to try to reduce your drag. It's not quite feathering the prop, like you would on a twin, but at least that says that you're trying, sort of like chocolates and flowers on the day after wifey's birthday
