stunthanger.com
Engine basics => Engine set up tips => Topic started by: Bootlegger on January 01, 2021, 08:09:09 PM
-
Guy's I need some advice/suggestions as what size (s) prop to use on this engine in a stunt model. Obliged,
-
Guy's I need some advice/suggestions as what size (s) prop to use on this engine in a stunt model. Obliged,
Same as on a 19, maybe an 8-5 or 8-6?
Brett
-
Boot,
Are you running a muffler or open face? Open face you could use a narrow 9x5 or 6 (like a Zigger or MAS) with a muffler you need to drop to the 8 ish diameter maybe cut down a Brodak BY&O 9x5 or 6 to keep the engine running cool. What ship are you planning to use it in? Again if open profile lots of cooling can push the diameter up a bit, if cowled need to go toward the smaller diameter to reduce load and heat. Also, use fuel with at least 25% total oil of which it should be at least 50% castor.
Best, DennisT
-
Go with what Brett said.
However, I've also had good results with the old Top-Flite 9-6 wood props.
I have a few of the .201s and there is virtually no difference between it and the Fox .19.
Having run quite a few of these from the 50s, like the .19, .201, .25, .29 and .35, I caution the use of mufflers.
I have tried a number of different mufflers and most if not all have caused overheating.
I have hundreds of flights on the above mentioned sizes and I've used only Brodak 10/23, 50-50 oil and all the engines run perfectly.
The engines were acquired both new and used.
Bill Mohrbacher (SP?) told me that the reason for the .201 was to be able to use the same plane in two different classes - A, up to .200 and B, .201 to .30.
Bob Z
-
Use whatever you would use on a Fox 19.
There is a ...... rumor ........ in the Free Flight community that the Fox .201 is actually a Fox 19 with a different mark on the case.
-
Huh? You mean my highly sought after torp "201" is nothing but a low rent 19 cleverly disguised?? Dang.
-
No rumor. You can see where the .19 was filed off and the .201 stamped in. This was done for the free flight folks. Put it in class "B" . D>K
I understand using the same case.
I've been told that internally they are identical.
-
Here is a source for information on the Fox 19 http://sceptreflight.com/Model%20Engine%20Tests/Index.html
If you look in the Glow/Ignition tab you can see a couple reviews for the Fox 19 (1954 model). It looks like it could run the popular 9x4 setup at 13K with will keep up with the OS 20FP setup. No listing for the Fox 20.
Best, DennisT
-
Here is a source for information on the Fox 19 http://sceptreflight.com/Model%20Engine%20Tests/Index.html
If you look in the Glow/Ignition tab you can see a couple reviews for the Fox 19 (1954 model). It looks like it could run the popular 9x4 setup at 13K with will keep up with the OS 20FP setup. No listing for the Fox 20.
Not a chance, not even in the same league. It can probably make it up to level flight speed with that prop, but it will be dead-dead-dead in the maneuvers. I tried a bunch of engines like this, no way, including the roughly equivalent OS-20S and stronger 25S. The Veco 19BB can barely manage, this is much weaker.
If you want that kind of performance, you *have to get a decent modern engine*, there is nothing you can do with these old baffle-piston engines that will make them match up.
Brett
-
I still have a couple of 19's & 25's as well as a 201. These are roughly 64/65 vintage and the 19's would do 85mph on a Jr. Flite Streak with a yellow Grish 8x6. They liked that prop. I flew the 25's on a Firecat with the Revup 9x5 and it was pretty capable on 52 ' lines. These 19's had a lot more steam than the 15's which I thought were pretty poor power wise. The 19's were close to the Veco 19 power wise and I always thought they were pretty good. :)
Dan