rkk01 Posted February 13, 2021 Share Posted February 13, 2021 Just completed my first P-47 landing... and “walked away”... Main engine bearing failure at 20,000’... can’t help thinking these radials are now way too fragile!? someone else was asking about glide speed - flaps down and 150 IAS seemed easy to control. Wheels down landing in a field at about 100 and managed not to collapse the wheels! Pretty sure if I tried that on a runway it wouldn’t have gone so well Link to comment Share on other sites More sharing options...
_Spad_ Posted February 14, 2021 Share Posted February 14, 2021 How did it fail at 20,000? Were you in a dive? Link to comment Share on other sites More sharing options...
Diesel_Thunder Posted February 14, 2021 Share Posted February 14, 2021 (edited) How where you operating the engine when it failed (RPM, MP, and boost settings, also was fuel mixture set to auto lean or auto rich)? And how were you flying; level, climbing, or diving? Landing speed is right around 90 depending on weight, so you weren’t far off on the landing speed. For some background on the engine bearings, see my recent thread here: Edited February 14, 2021 by Diesel_Thunder 1 PC: MSI X670E, Ryzen 9 7900X, 64GB DDR5 RAM, RTX 3090 Ti, TM Warthog HOTAS, Saitek Pro Flight pedals, Opentrack Link to my Youtube Channel: https://www.youtube.com/c/DieselThunderAviation Commander, 62nd Virtual Fighter Squadron Join the 62nd VFS today! Link to our discord server: https://discord.gg/Z25BSKk84s Link to comment Share on other sites More sharing options...
rkk01 Posted February 14, 2021 Author Share Posted February 14, 2021 Playing around with stalls and spins... pulled the throttle back to idle with a slight nose up attitude to provoke a stall before kicking the rudder to get the plane spinning - all at about 22k. Throttled up coming out of the spin and the prop seized... Link to comment Share on other sites More sharing options...
_Spad_ Posted February 14, 2021 Share Posted February 14, 2021 12 minutes ago, rkk01 said: Playing around with stalls and spins... pulled the throttle back to idle with a slight nose up attitude to provoke a stall before kicking the rudder to get the plane spinning - all at about 22k. Throttled up coming out of the spin and the prop seized... See post above. High RPM and low MP isn't good for radial engines. Most likely your prop was windmilling during your spin and this caused the engine bearing failure. Link to comment Share on other sites More sharing options...
rkk01 Posted February 14, 2021 Author Share Posted February 14, 2021 Makes sense... adjust the prop pitch or not reduce as much throttle? Link to comment Share on other sites More sharing options...
Diesel_Thunder Posted February 14, 2021 Share Posted February 14, 2021 Both, pull the pitch back and keep some throttle on to make sure the prop doesn’t windmill the engine. Reducing the RPM gives you more room to pull the throttle back (reducing MP). Also following the old rule of thimb of 1” of MP for every 100 RPM helps and is easy to remember. Example is if you set RPM to 1,800, you can pull the throttle back to 18” MP. PC: MSI X670E, Ryzen 9 7900X, 64GB DDR5 RAM, RTX 3090 Ti, TM Warthog HOTAS, Saitek Pro Flight pedals, Opentrack Link to my Youtube Channel: https://www.youtube.com/c/DieselThunderAviation Commander, 62nd Virtual Fighter Squadron Join the 62nd VFS today! Link to our discord server: https://discord.gg/Z25BSKk84s Link to comment Share on other sites More sharing options...
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