>I am beginning the construction of my Rocketman Rocketboy and I ran into
>a small problem with the motor retention. I am wondering what the
>"Timberman Nuts" are and how they attach to the rear centering ring.
>Any suggestions? Also, does anyone know of a good way to remove the aft
>centering ring after you tack the fins in to do teh interior fillets?
Those would be 'Tinnerman' nuts,and not the type you want to use. What you
want are 'T-nuts',and you can buy them (larger sizes) at Home Depot,smaller
ones at good hobby shops. you drill a hole and tap in the T-nut,it has two
prongs to bite into the wood to prevent turning.It's best to use a little
epoxy ,too. If you mount your T-nuts in the ring first,then you can run
screws into them to use as handles to help pull out the CR after the
front/center CR's glue sets up.
Tinnerman nuts are made from a flat piece of steel,and stamped with a hole
and two tabs flared out for the***threads to follow.Not good for
T-nuts have a threaded collar and a flat 'top hat' with prongs bent
down,making the 'T' shape.
Jim Yanik,NRA member