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Engine basics => Engine set up tips => Topic started by: RknRusty on November 11, 2014, 11:57:15 PM

Title: Shaft extension for Fox Stunt 35 EJC49
Post by: RknRusty on November 11, 2014, 11:57:15 PM

I have a Fox Stunt 35, I believe it's a 1958 model EJC49.
I can't quite get enough threads on the shaft to install a Dubro spinner with a backplate when I use a 10x5 prop. Almost, but not enough for safety. Is there an extension I can use to adapt to this spinner? Searching turned up some confusing answers.
Thanks
Rusty

Title: Re: Shaft extension for Fox Stunt 35 EJC49
Post by: Bootlegger on November 12, 2014, 04:20:43 AM

 Something else that you might try is a spinner with a thinner back plate.
 Check the Tower Hobbies web site as Great Planes makes one that I use a lot, and this is one of the reasons...

Title: Re: Shaft extension for Fox Stunt 35 EJC49
Post by: Dick Pacini on November 12, 2014, 09:31:59 AM

Draw me a sketch and I will make one for you...no charge.

Title: Re: Shaft extension for Fox Stunt 35 EJC49
Post by: RknRusty on November 12, 2014, 09:42:49 AM

Thanks guys. If Gil's suggestion doesn't work out for me, I'll get a sketch together for you, Dick. I appreciate your generous offer.
Rusty

Title: Re: Shaft extension for Fox Stunt 35 EJC49
Post by: RknRusty on November 12, 2014, 02:03:15 PM

I wonder if this is 2" spinner with the aluminum backplate is one of the thin ones.
http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXBMY1&P=ML

The specs say the backplate thickness is 1.8" but that makes no sense. That must be the diameter.
Rusty

Title: Re: Shaft extension for Fox Stunt 35 EJC49
Post by: Steve Helmick on November 12, 2014, 06:12:47 PM

That's a good spinner, Rusty. A bit of a hassle to get the prop aligned, but not too terrible. A lot of guys throw out the funny metric screws and tap the backplate to 4-40 and use socket head cap screws...a real good idea! To my way of thinking, any spinner with a plastic backplate sux...

I often use this (see link) prop nut/washer from Dave Brown products. The washer is hardened and the nut is stepped, so can screw onto more threads on the crank snout. When I use a Randy Aero spinner, I use a Gr.8 SAE flatwasher and a steel 1/4-28 coupler nut from the hardware store.   H^^ Steve

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXB952&P=7 (http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXB952&P=7)

Title: Re: Shaft extension for Fox Stunt 35 EJC49
Post by: RknRusty on November 12, 2014, 10:20:27 PM

Quote from: Steve Helmick on November 12, 2014, 06:12:47 PM

...I often use this (see link) prop nut/washer from Dave Brown products. The washer is hardened and the nut is stepped, so can screw onto more threads on the crank snout. When I use a Randy Aero spinner, I use a Gr.8 SAE flatwasher and a steel 1/4-28 coupler nut from the hardware store.   H^^ Steve

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXB952&P=7 (http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXB952&P=7)

That's the ticket!
(http://www2.gpmd.com/image/d/davq8428.jpg)
Thanks a bunch, Steve. You've helped me out yet again.
Ordering one now.
Rusty