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Old Jan 24, 2013, 08:27 AM
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United States, NM, Clovis
Joined Jan 2013
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That is interesting, Kiwi. I've never owned a Fox, so I am unfamiliar. Those Fox spraybars must have worked as Fox was in the selling engines business. Why are they such a bother?
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Old Jan 24, 2013, 08:48 AM
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When I first started flying Fox stunt 35s, in 1977, I could not get consistent runs. Put in Super Tigre NVAs and problem solved.

After Duke passed away, the late John Lowery brought Betty Fox to several St. Louis contests. He told that he had showed Betty that most Fox engines on the flying field did not have Fox NVAs. This led to a change from the old Fox flat end needle to a more conventional needle.
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Old Jan 24, 2013, 07:16 PM
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What was the purpose of 2 jets in a Fox 35 NVA? The only thing I could think of was an attempt at better fuel "atomization"?<--a word from the 50's.
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Old Jan 24, 2013, 07:18 PM
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United States, SC, Columbia
Joined May 2010
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Here's a video of my MP Jet running:
MP Jet .061 control line engine demonstration (9 min 48 sec)


EDIT: Yes I know the head is on sideways(in the second half of the video).
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Old Jan 24, 2013, 09:29 PM
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Adelaide, South Australia
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Quote:
Originally Posted by tigreflyer View Post
What was the purpose of 2 jets in a Fox 35 NVA? The only thing I could think of was an attempt at better fuel "atomization"?<--a word from the 50's.
There were a few engines that had spray bars with two holes but the Fox was slightly different because the holes weren't 180 degrees apart. The correct way to fit them was when you couldn't see either of the holes when looking down the venturi. It's known that you get better fuel draw if a hole is pointing slightly down instead of being directly across from the venturi side (down by about 10-15 degrees) so possibly this was the way Fox ensured correct fitting.
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Old Jan 24, 2013, 11:23 PM
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...It's known that you get better fuel draw if a hole is pointing slightly down instead of being directly across from the venturi side (down by about 10-15 degrees) so possibly this was the way Fox ensured correct fitting.
That's always been my understanding too. But last weekend I was building an engine to compete in our annual Tach Race that we hold to kill time every Winter at cox engine forums, and found mine behaved differently. For the Unlimited class, I had a standard Bee crankcase, a lapped and polished crankshaft, with a Tee Dee cylinder and a wide bore Killer Bee backplate. I used a backplate with the spraybar angled at the widely accepted 15 degree offset and the engine ran respectably and smooth, but only at about 19.4k RPMs(we're using 5x3 gray Cox props). The last test I did after getting everything else to peak out was to try a spraybar with the hole pointed straight down the throat, and picked up an additional 400 RPMs. I switched back to the first one and lost 400, so I switched back to the straight shooter again, tested it with the same extra 400 and shipped it off to the race. It was running 19.8k, bouncing off of 20. Hopefully good for a top three, but some of these guys are much better at it than I am.
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Old May 28, 2013, 03:42 AM
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Wow ,

What ? No more engine pictures ...
We love engines dont we ?


Here is my latest Ebay find - all the way from Poland !

KMD 2.5 Diesel , and as near as I can tell , un-run

Enjoy the pictures
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Old May 28, 2013, 10:05 AM
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United States, NM, Clovis
Joined Jan 2013
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Nice. Here's my latest acquisition, it came from E-Bay with no compression despite the listing. But a friend sent me parts engines, and from that I was able to restore it. It is a K&B .20 Sportster for my CL use.
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Old May 29, 2013, 02:27 AM
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Adelaide, South Australia
Joined Sep 2003
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Enya ss45S

Here's my latest acquisition, a new version of the Enya ss45 where they've gone back to the old style of a cast iron piston and steel liner made specifically for CL. I couldn't resist .

So far though I haven't had the chance to strip it to check the timings, compression etc but I'll get around to that soon. Then it'll be time to carefully run it in with 25% all castor and no nitro.

BTW, the KMD above is the first (best) version. I have the later one that's all natural finish and cast venturi. Brand new though.
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Old May 29, 2013, 03:18 AM
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Quote:
Originally Posted by old4570 View Post
What ? No more engine pictures ...
We love engines dont we ?


Here is my latest Ebay find - all the way from Poland !

KMD 2.5 Diesel , and as near as I can tell , un-run

Enjoy the pictures
A couple of members of our c/l club have been experimenting with the KMD Blackheads for speed limited Diesel Goodyear.





They're good strong engines on the APC 7 x 6 test props. They both turn them at over 16.5K rpm which is in the strong Oliver Tiger range. In the air one of the pulls the model around at about 28 Seconds/10 Laps. They'd probably go harder on a smaller prop so you'd have to say that they're good value for the kind of prices they go for on Ebay.



The third pic is of the 1/2A Proto Speed model my son and I have built for a Russian 049 Combat motor.
Still unflown so far, but it now has the clear coat and numbers on the wings. The design is called a "Sweeper".






Ray
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Old May 29, 2013, 03:40 AM
WBE
Las Vegas Circle Burners
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United States, NV, Henderson
Joined Aug 2005
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Quote:
Originally Posted by downunder View Post
Here's my latest acquisition, a new version of the Enya ss45 where they've gone back to the old style of a cast iron piston and steel liner made specifically for CL. I couldn't resist .
Love the Enya Brian. Whenever I see a mid-sized Enya set up for stunt I immediately think of Bill Draper and his Superhawk. He really did well with the combination.
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Old May 29, 2013, 03:47 AM
WBE
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A flying buddy gave me an ugly, old LA46 to mess with so first priority was to remove all the blue nail polish.

When another friend asked why the blue was removed I told him it was so the engine could regain some of it's dignity back of course!
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Old May 29, 2013, 12:59 PM
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United States, MN, Andover
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Originally Posted by WBE View Post
A flying buddy gave me an ugly, old LA46 to mess with so first priority was to remove all the blue nail polish.

When another friend asked why the blue was removed I told him it was so the engine could regain some of it's dignity back of course!
What, you don't like Smurf made engines? LOL

Did you use Demon Clean? It looks pinkish. Just wondering if there is something else that works.
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Old May 29, 2013, 03:21 PM
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United States, OR, Albany
Joined Jun 2007
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Very nice, Looks a lot better in the original metal color. I'm not into smurf engines either.

George
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Old May 29, 2013, 04:01 PM
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Joined Apr 2012
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what are these engines painted with?
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