I always use a grub screw to lock my propellors where possible. I have lost a few myself mostly when using reverse.

Me too Colin, but it was only a cheap plastic prop, which wound itself off my destroyer on the lake wall! I did go down and look for it when they drained the lake for cleaning. No sign of it☹️
Now HMS Hotspur has brass props with lock nuts and Thread Lock.
I'll also be fitting Prop Guards!!! Cheers, Doug 😎
Greetings from Sunny Spain. Taken lots of inspirational pics and video in the Marina here 😉

I use threadlock on all my metal props, and on larger ones I drill and tap for a grub screw in the side of the prop body. I've only lost 1 prop since 1956.
Cheers Colin.

Hi,

Jacko is right!
Order this https://www.cornwallmodelboats.co.uk/cgi-bin/sh000001.pl?WD=thread%20locker%20zap&PN=ZAP%2dThreadlocker%2dZ71%2d6ml%2dbottle%2dPT71%2ehtml#SID=482

I use it to keep the Prop on my Tug Brooklyn!

try red lock tight and a locking nut