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General control line discussion => Open Forum => Topic started by: Gary Dowler on February 09, 2019, 01:33:48 AM

Title: Prop suggestion
Post by: Gary Dowler on February 09, 2019, 01:33:48 AM: Flying weather is coming. Though with our brand new frigid temps and 5" of snow it may be further off that it looked a few days ago.
I have a new to me Ringmaster that wears a Fox 25. Both are new to me. Never got a flight up on it last season. I'm inclined to prop it with a APC 9-4 as I do my 20FP's. I don't know enough about the 25 to really know if this is right. It seems a better revving motor than the old 35.

Suggestions?

Gary
Title: Re: Prop suggestion
Post by: peabody on February 09, 2019, 02:39:45 AM: Foxes don't like revs like an FP
Try a 10 X 6
Make sure that you have plenty of high castor (25%+)
The APC 10 X 6 will be fine to start with..
Title: Re: Prop suggestion
Post by: Fred Quedenfeld jr on February 09, 2019, 06:01:13 AM: which fox 25 is it the old one that is similar to the fox 35 stunt or the newer schnulee ABC
the old one runs slow with more pitch the new one less pitch with lots of rpms
Just My 2 cents
Fred Quedenfeld
Title: Re: Prop suggestion
Post by: Peter in Fairfax, VA on February 09, 2019, 06:13:39 AM: Yes, which Fox .25? There are several distinct ones over the years. Send a picture, if needed.

Peter
Title: Re: Prop suggestion
Post by: Gary Dowler on February 09, 2019, 07:11:21 AM: Quote from: Fred Quedenfeld jr on February 09, 2019, 06:01:13 AM
which fox 25 is it the old one that is similar to the fox 35 stunt or the newer schnulee ABC
the old one runs slow with more pitch the new one less pitch with lots of rpms
Just My 2 cents
Fred Quedenfeld
I'll look when I get home from work in about 2 hrs.
Title: Re: Prop suggestion
Post by: Gary Dowler on February 09, 2019, 10:02:07 AM: One Large port behind the baffle piston.

(http://i67.tinypic.com/6rkb4h.jpg)
(http://i65.tinypic.com/f41cu8.jpg)
Title: Re: Prop suggestion
Post by: Brett Buck on February 09, 2019, 10:22:32 AM: Quote from: Gary Dowler on February 09, 2019, 10:02:07 AM
One Large port behind the baffle piston.

9-6 or 9-5.

Why is it taken apart?

Brett
Title: Re: Prop suggestion
Post by: john e. holliday on February 09, 2019, 12:04:52 PM: I use 9-5's on my Fox .25's. D>K
Title: Re: Prop suggestion
Post by: Gary Dowler on February 09, 2019, 07:53:24 PM: Quote from: Brett Buck on February 09, 2019, 10:22:32 AM
9-6 or 9-5.

Why is it taken apart?

Brett
Just to get a good look at the ports. With the height of the baffle on the piston I couldn't be certain of just what was hiding in there.

Gary
Title: Re: Prop suggestion
Post by: M Spencer on February 09, 2019, 08:43:47 PM: I run TF 8x6 , 9x6 , or 9x4 ( best ) on mine. In twins .

If its light & you want the 5.0 per lap bit , the topflite nylon 9 x 4 orIve used Zinger 9x5 woods .

This test ( sceptre flight ) is the later retimed one - Black steel prop driver .They wake up on 15 or 20 % nitro . & can run ' the break ' .

(http://sceptreflight.net/Model%20Engine%20Tests/Fox%2025%20RC-3.jpg)

Think I run the heads around 7 thou. clearance . They varied a bit .

Yours is a earlyish , 1972 maybe , as only vertical weeny muffler screw thingos .74 ish on there fore n aft also . later undrilled on the up & down .
Title: Re: Prop suggestion
Post by: M Spencer on February 18, 2019, 07:17:32 PM: (https://i.ebayimg.com/images/g/YIsAAOSwmo1cWmZe/s-l1600.jpg)