PROBLEM WITH AN OLDER ROSSI
 

I have an older (carb input at the rear) .61 ROSSI engine. I put a MASTER AIRSCREW prop on it and I can barerly get the hold down nut onto it.

Q) how do I extend my prop shaft so that I can get the nut on 100% --- let alone some kind of spinner.

marwen1

RE: PROBLEM WITH AN OLDER ROSSI
 

....you have a ducted fan engine, with a short stud. Get a nut and a bolt with the
same thread as the engine. Thread the nut onto the bolt,and chuck the bolt up in
a lathe. Leave about 1/4 of the nut alone, and turn down the other 3/4 round until
you have about 1/8" "meat" left from where the threads are.

Now you need a thin washer that fits onto your turned-down nut. You have to bore
out the hole in the prop, so your new nut fits into in. It's a "counter-bored prop now. ;)

FBD. :D

RE: PROBLEM WITH AN OLDER ROSSI
 

[quote]ORIGINAL: Flyboy Dave

....you have a ducted fan engine, with a short stud.

unquote]

Very probably so. This .61 has also been bored out to a .81 and from I'm told, the last time it was even used was in a fan jet system

Q) Any idea what RPM I should be able to turn? & Q) what fuel should I use?

I amgoing to use this as a PUSHER PROP ASYSTEM on a bumped up FORCE ONE. From the normal 36.5"WS to a 60"WS DELTRA WING.

MARWEN1

RE: PROBLEM WITH AN OLDER ROSSI
 

Doesn't Fox still make prop extentions ? ( crankshaft extention )

RE: PROBLEM WITH AN OLDER ROSSI
 

Tru Turn has a short shaft spinner adapter...
Would that do in this case?

RE: PROBLEM WITH AN OLDER ROSSI
 

Hi!
What you do is this! You get an aluminium spinner nut with a treaded flange that extends inside the prop.
Or if you have a Tru Turn alu spinner...a nut with a flange that goes inside the prop.
How many do you want?

RE: PROBLEM WITH AN OLDER ROSSI
 

....you need one of these, only in size 8X1.25, this is the wrong thread pitch.

This Rossi shaft should have the same thread as yours. Rossi .45 & .61 show
the same size and thread pitch.

FBD.

RE: PROBLEM WITH AN OLDER ROSSI
 

....here it is, click on TRU 0826 :D It's the short shaft kit, with the correct thread. ;)

http://www.chiefaircraft.com/rcmsec/...s/TruTurn.html

FBD. :D

RE: PROBLEM WITH AN OLDER ROSSI
 

.....the ones jaka has will work with no spinner. ;)

RE: PROBLEM WITH AN OLDER ROSSI
 

I think that Tru Turn is the way to go. I sent BOB at Tru-Turn an email telling him what I have and left it up to him to tell me what I need to make my ROSSI work with the MASTER AIRSCREW 3 blade PUSHER PROP that I have on it now.

Much thanks my fellow RCers.

Some times I have to wonder how in heck did I EVER manage to build anything before this forum came along

Y'all have a GREAT day!

marwen1