Bent GR L40 x 57

[detox]

The leading edges of my once "very sharp" Grimracer L40 X 57 prop are now bent. This was one of the few props I did not harden after sharpening. I am sure if I had this prop hardened this would have not happened. I am pretty sure prop never hit anything other than water. UL-1 still managed a top speed of 49.6mph using this BENT prop.

[detox]

Do we need a prop hardening lesson? Courtesy of the ellusive Brian Buaas.

I've done it a couple ways.

#1. If you really want them HARD: Anneal them at 1225F for an hour and quench in water. Do all you prop work: sharpen, balance, thin, cup etc. Then 600F for 2 hours and turn off the kiln and just leave them to cool overnight. This yields very hard props, but you can no longer work them at all.

#2. Just do the 600F step after yo work the prop. Still very hard, but you canbend them a little if you really need to.

[detox]

Next I will torture test my HARDENED Grimracer L38 x 55 and Octura m440


...

[LuckyDuc]

Wow. You must have thinned the edges pretty good. Why didn't you hardened that prop when you did the others? Those Grimracer L40x57s are a major PITA to balance, sharpen, and thin.

[Brushless55]

What you did'nt harden that prop, whats wrong dude!
Not really and I have know idea how to do such a thing..

[egneg]

They look like they are bent in - not out.

[LuckyDuc]

They look like they are bent in - not out.

Yeah, I thought that too. Did you hook up the motor in reverse or something?

[detox]

Yeah, I thought that too. Did you hook up the motor in reverse or something?

It seems blades leading edges should have bent in other direction. I am sure blades never turned in reverse. I do not know