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Author Topic:   Prop Damage and Engine RPM's

tlynch posted 09-06-2002 12:03 PM ET (US)
Does damage to the leading edge of a propeller cause the max RPM's for an enigne at WOT to drop?
My engine has been through a whole lot lately, including a small 1/2" long ding along the leading edge of one blade (Stainless), maybe the leading edge is bent 1/8" from staight in the center of the ding. Could this result in a loss of about 250 RPMs?
Can you hammer the blade back flat with a hammer and something behind the blade?
Thanks,
Todd
Tom W Clark posted 09-06-2002 12:09 PM ET (US)
Todd,
Yes a damaged prop can cause a loss in RPM's. It can cause an increase too depending on the nature of the damage.
The ding you describe is very slight and I do not think it would affect your RPM's measurably.
Yes, you can straighten out that ding with a hammer and something to back it up, preferably a chunk of steel.
You should probably take your prop to a prop shop at the end of the season and have it truly straightened out and balanced. No big deal or expense in that task.
Bigshot posted 09-06-2002 04:18 PM ET (US)
Basically you just cupped your prop. It could cause that many Rpm drop but doubtful. Straighten it out and see. Do Not drive it that way being one blade is grabbing way more than the other 2.

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Author	Topic: Prop Damage and Engine RPM's
tlynch	posted 09-06-2002 12:03 PM ET (US) Does damage to the leading edge of a propeller cause the max RPM's for an enigne at WOT to drop? My engine has been through a whole lot lately, including a small 1/2" long ding along the leading edge of one blade (Stainless), maybe the leading edge is bent 1/8" from staight in the center of the ding. Could this result in a loss of about 250 RPMs? Can you hammer the blade back flat with a hammer and something behind the blade? Thanks, Todd
Tom W Clark	posted 09-06-2002 12:09 PM ET (US) Todd, Yes a damaged prop can cause a loss in RPM's. It can cause an increase too depending on the nature of the damage. The ding you describe is very slight and I do not think it would affect your RPM's measurably. Yes, you can straighten out that ding with a hammer and something to back it up, preferably a chunk of steel. You should probably take your prop to a prop shop at the end of the season and have it truly straightened out and balanced. No big deal or expense in that task.
Bigshot	posted 09-06-2002 04:18 PM ET (US) Basically you just cupped your prop. It could cause that many Rpm drop but doubtful. Straighten it out and see. Do Not drive it that way being one blade is grabbing way more than the other 2.