Author Topic: 1955 fox .35 Prop (Read 83647 times)

DanielGelinas · « **on:** July 06, 2012, 09:59:59 AM »

Hi Guys,

I tried installing two modern props on this engine (APC and Master Airscrew 10-6). These propellers are so thick the nut only screws on 3/4 of the threads. It would seem that the propeller's shaft is shorter than modern fox engines.

Is my only option wood propellers? What are you guys using on a 1955 fox engine?

Thanks,

-Daniel

De Hill · « **Reply #1 on:** July 06, 2012, 10:28:58 AM »

There are three things that you can do:

1. Use a thinner prop washer.
2. Use a thinner drive washer. (Ohlsson & Rice would be good.)
3. Or both.

FLOYD CARTER · « **Reply #2 on:** July 06, 2012, 10:46:17 AM »

Master Airscrew props have so much meat at the hub, it wouldn't hurt to grind some off. I've had to do that when using a metal spinner backplate that takes up more shaft length.

Floyd

Marvin Denny · « **Reply #3 on:** July 06, 2012, 11:00:56 AM »

I would try the nut and prop washer fot the Fox Spinner. It will give you some three or more threads to hole the prop. I have several if you want, I will send you one to try out and if it works, you can pay me---if not, you can send it back.

Bigiron

DanielGelinas · « **Reply #4 on:** July 06, 2012, 11:39:53 AM »

Thanks Marvin,

That sounds like a good plan.

I'll PM you my address.

Kind regards,

-Daniel

EddyR · « **Reply #5 on:** July 06, 2012, 12:49:57 PM »

The Double star .50 had this problem also . The fix was easy. Drill a larger hole in the prop washer and then used a nut that has a front section the size of the hole. The back section hits the prop washer face. Maybe this is what Marvin has?

It adds the thickness of the washer to the threads. I drilled out the front of the prop on one to clear the prop nut. It may be hard to understand but is very simple to do. I will draw a picture if anyone wants it.Many spinners come with this style prop washer. Brodak's do

Ed

Gene O'Keefe · « **Reply #6 on:** July 06, 2012, 01:32:28 PM »

What Ty said

Garf · « **Reply #7 on:** July 06, 2012, 05:46:16 PM »

You can mix and match some of the old prop extention parts.

Randy Ryan · « **Reply #8 on:** July 07, 2012, 07:50:21 AM »

Quote from: FLOYD CARTER on July 06, 2012, 10:46:17 AM

Master Airscrew props have so much meat at the hub, it wouldn't hurt to grind some off. I've had to do that when using a metal spinner backplate that takes up more shaft length.

Floyd

Sorry but have to comment here. Floyd you may have had good luck with this but modification of ANY prop at the hub is not a good idea. They're dangerous enough without making them weaker. MA's are kind of brittle which make them more suceptable to to fatigue fractures, cutting at the hub will cause stress risers that beg "break me here!"

Bill Little · « **Reply #9 on:** July 07, 2012, 01:50:33 PM »

I have had to use a Veco extension "nut" (cut down slightly) to get a hold of the threads before.

BIG Bear
RNMM/AMM

DanielGelinas · « **Reply #10 on:** July 08, 2012, 07:24:29 AM »

Thanks for the reply's guys!
-Daniel

Marvin Denny · « **Reply #11 on:** July 08, 2012, 10:06:45 AM »

The spinner adapter nut and washer will be in the mail tomorrow.

Bigiron

DanielGelinas · « **Reply #12 on:** July 08, 2012, 12:28:23 PM »

Thanks Marvin

Steve Helmick · « **Reply #13 on:** July 08, 2012, 07:04:06 PM »

Take a look in the Dave Brown (spinner) website and see if there isn't a stepped nut/washer combo available. They sell spinner adapters like that, but not 100% sure they have a basic nut, like you need.

Steve

Phil Spillman · « **Reply #14 on:** July 09, 2012, 06:59:01 AM »

Tru Turn nut/washer combination for 1/4 28 threads will do the trick here no sweat!

Phil Spillman

Bob Reeves · « **Reply #15 on:** July 09, 2012, 01:59:39 PM »

Sounds like Marvin has him fixed up..

Hey Marvin, whats the longest shaft extension you might have in your parts stock? Or maybe I should ask what's the longest shaft extension that is practical?

DanielGelinas · « **Reply #16 on:** July 09, 2012, 03:13:04 PM »

Hi Phil,

Just curious. Where would one find the <Tru Turn nut/washer combination for 1/4 28 thread>?

Thanks,

-Dan

Marvin Denny · « **Reply #17 on:** July 09, 2012, 07:04:59 PM »

Quote from: Bob Reeves on July 09, 2012, 01:59:39 PM

Sounds like Marvin has him fixed up..

Hey Marvin, whats the longest shaft extension you might have in your parts stock? Or maybe I should ask what's the longest shaft extension that is practical?

I put his spinner adapter nut and washer in ther mail this morning.

The longest commercially available that I know of is 3/4ths inch. The longer you get the extension, the more critical the balancing becomes I made onean inch and a quarter once for a friend. It was based on the old Veco type. He never told me how it worked.

Bigiron

Phil Spillman · « **Reply #18 on:** July 10, 2012, 07:04:54 PM »

Hi Dan, I have over the years bought many Tru Turn Spinners! Each came with their own adaptors with a washer hollowed down so as to not take as much space on a short shaft such as the original Foxes and the first models of the Brodak engine! I just used them with or without the Tru Turn spinner! I also believe that they are available as a separate item from Tru Turn. Sure hope this helps!

Phil Spillman

Marvin Denny · « **Reply #19 on:** July 10, 2012, 07:48:20 PM »

Phil, that is what the fox unit does that I sent him and is considerably lighter than the Tru-Turn .

Bigiron

bill bischoff · « **Reply #20 on:** July 10, 2012, 07:52:07 PM »

Not to mention the Tru Turn needs a much bigger hole in the prop (7/16" I think.)

DanielGelinas · « **Reply #21 on:** July 11, 2012, 07:12:36 AM »

Thanks for the info Guys!
-Daniel

Marvin Denny · « **Reply #22 on:** July 11, 2012, 10:50:06 AM »

Quote from: bill bischoff on July 10, 2012, 07:52:07 PM

Not to mention the Tru Turn needs a much bigger hole in the prop (7/16" I think.)

Bill, you are thinking of the shaft extension. The spinner adapter nut and washer does not require the prop to be bored out.
The nut extends only through the washer to even with the rear face of the washer, thus picking up the threads that are lost with the standard nut and washer.

Bigiron

Steve Helmick · « **Reply #23 on:** July 11, 2012, 11:41:05 AM »

You might find this item in any LHS, by either Tru-Turn or Dave Brown. No extra prop drilling required. This one is actually for mounting a spinner, but they might have one without the concentric spinner mounting nub. The "short" usually is the way to go for a typical 1.75" to 2.25" spinner, since a longer screw is easily obtained at Canadian Tire.

Steve

DanielGelinas · « **Reply #24 on:** July 19, 2012, 06:50:06 AM »

Received Marvin's part in the mail yesterday.

Fits great and now I can use any 10-5, 10-6 propeller.
Thanks to all for your help!
AND THANKS TO MARVIN FOR THE PARTS!!!

-Daniel

Steve Helmick · « **Reply #25 on:** July 19, 2012, 10:47:34 AM »

The APC 10-5 is known to work very well on Fox .35 Stunts. Master Airscrew props are typically viewed with some scepticism, possibly because they are known to be under the pitch rated. The APC's are sort of the opposite, but for a different reason. They are pretty close in pitch, but function as though they are higher pitch than labled, so stick with the 5". Zingers are pretty awful off the peg, but can be reworked to function ok if you have the time and patience. I hate the finish on them, as it gums up my sandpaper somethin' awful. Top Flite "Power Point" props are much better for "plug & play" use, but I can't say whether a 10-5 or 10-6 would work better. I'd try both. I would also highly recommend that you go through the Tower Hobby site and find the Thunder Tiger 10-5.5 Cyclone prop and give them a try...not many sizes, but very good props.

Steve

DanielGelinas · « **Reply #26 on:** July 19, 2012, 04:36:29 PM »

Thanks Steve,
I have the APC 10-5 on a newer fox. You are right, its a good prop for the fox 35.
I'll try the tt prop next order at tower.
Regards,
-Daniel