Recent content by Tom Fey

This is a hollow steel Aeroproducts blade, drawing H20H-162-40M5, used in the A422-E1/E2 propellers that pulled the NAA T-28A with the 800 HP Wright R-1300. Installed diameter is 10 foot 0.5 inch. P-51 air racers and Tsunami, loved these high-activity factor blades The prop manual and revision...

Republic Rocket.

https://www.enginehistory.org/members/articles/Sleeve.pdf

Fairly new channel "AEHS" with mixed-era aviation content and an emphasis on engines. I'm a member of the AEHS, so I am indeed biased. https://youtu.be/khnYsZTttBo

Author Dave Birch writes in "Rolls-Royce and the Mustang" that the air coming out of the Merlin 61 two-stage supercharger at 18lbs. boost was about 200°C (392°F) but was reduced to 120° (248°F) by the aftercooler for induction into the engine.

Thanks for that, Calum. 12.7 kilowatts is 17 horsepower or about 1% of the 2,000 hp output at takeoff.

Thanks for this. Learning new things all the time.

The Curtiss propeller on the B-36 is unique in many ways. Here is part of that story: https://www.enginehistory.org/Propellers/Curtiss/B-36/B-36.shtml

The Merlin V-1650-9 in the P-51H made 2,270 horsepower wet and used the high activity factor, H20 series Aeroproducts propeller blade which is the same blade family as used on the Bearcat. The oil cooling used a liquid-liquid heat exchanger instead of an oil radiator and ducting. All this helps...

If they could clean a patch of the blade and put a drop of vinegar on it, magnesium will cause bubbles to form due to the acid, causing slight etching. Aluminum is unaffected by the mild acid. That being said, I doubt a magnesium blade would survive this long in salt water.

If a magnet sticks to it, the metal tipping is zinc-coated steel called terne plate. The sheathing is held in place by screws and rivets, the heads floated with solder, and smoothed. See attached.

Dora props were Junkers hydraulic propellers.

It's like 3D chess with many ways to win the game. Blade loadings, like wing loadings, become important for efficient performance, and depend upon horsepower, RPM, airspeed, blade area, blade number, and activity factor (ability of a blade to take horsepower). Blade loadings and the desired...

Even though there were two output shafts emanating from certain versions of the V-3420, including the engine on the P-75, the shafts were internally linked by gears inside the case. Therefore, the independent control of the two propeller discs (feathering; reversing; rpm) and operation on a...

I think Michael Hope is correct regarding your propeller blade. The (missing) segment gear and the blade are number-matched at assembly in the factory. This is because a pin goes through that hole in the blade to lock the segment gear in place, and that is a precision alignment. The "88462"...