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Running a Wen Mac Throttled .049 Empty Running a Wen Mac Throttled .049

Post  rsv1cox Fri Aug 19, 2022 10:13 am

I can't recall ever running one of these.  Cox 25%, Wen Mac 6/3 prop.  Recomended 1 1/2 turns on the needle.  Cox clip works well.

Easy start using Wen Macs starter.  Throttle arm set close to idle.  Running really rich, castor bubbling.  Leaned it out twice before I could get a good throttle response.  Idle all day in the single digits, but could only get about 5700 rpm out of it max.  Old fuel, I mean really old fuel and I never got it really leaned out.  Rinky dink fuel tank set-up hot glued on.

First picture is after I shut it down, pinched tubing with long nosed, used a lot of fuel.

Running a Wen Mac Throttled .049 P1013855
Running a Wen Mac Throttled .049 P1013856
Running a Wen Mac Throttled .049 P1013857
Running a Wen Mac Throttled .049 P1013858

One of the really good castor slingers.

Running a Wen Mac Throttled .049 P1013859
Running a Wen Mac Throttled .049 P1013860
Running a Wen Mac Throttled .049 P1013861

Seems like I always make a mess.

Running a Wen Mac Throttled .049 P1013862
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Post  rdw777 Fri Aug 19, 2022 10:59 am

A little engine time is fun… Nice to hear one scream every once in a while.. I’ve been enjoying playing with the throttle on the PeeWee… It’s taken a while to get the bugs worked out but getting closer…. I did all the normal things but was only getting about 15K on a 4.5x2…I finally noticed some whitish oxidation on the crankshaft so I made up a stud/holder and put it in the drill press and polished it with some 2000 grit sandpaper… Sings up to about 17.5 now… Idles good (relativity) too

Running a Wen Mac Throttled .049 B7a28410

I had a tank with a hole in it so I dressed it up a bit then made a balloon tank to get a little more run time…Running a Wen Mac Throttled .049 1b1e8a10
Running a Wen Mac Throttled .049 91b9ad10

That one is 9cc which is a little much so I made up a 6cc to try next..
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Post  GallopingGhostler Fri Aug 19, 2022 11:23 am

Bob, your engine run shows the Wen-Mac throttled to be a nice engine. (Repeat of your earlier March 14 run, but with a different engine?
https://www.coxengineforum.com/t16127-hot-off-the-mail-truck-running-a-throttled-wen-mac-vii#208983 )

It would make a nice R/C engine for a sport plane. I guess the only downside is the rarity in getting glow heads. Using a glow head plug adapter would bring its power back down to the earlier 1950's engines. (Unless one used it to power a .020 or smaller, light .049 plane - DMECO Kitten.)
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Post  rsv1cox Fri Aug 19, 2022 12:32 pm

Ha on me George, I forgot about that one.  Different engine, I put that one on a W/M Peashooter.  I have about a half dozen of the throttled W/M's.  

Just got the one that spent 10 days in Baltimore a couple of days ago.  Sent from Knoxville Tn, about a six hour drive away.  USPS took 13 days to get it here.  It's shown in the last picture above, next one to run.  

Came with a 4.5/5 W/M prop.  Another different one.  But no throttle return spring.

Running a Wen Mac Throttled .049 P1013869
Running a Wen Mac Throttled .049 P1013868


Running a Wen Mac Throttled .049 P1013864
Running a Wen Mac Throttled .049 P1013865
Running a Wen Mac Throttled .049 P1013863

Totally locked up engine.  Berryman's/soapy/clean water dip.  Heat, would not loosen.  Starter not the engine.  Usually I can free it by rocking back and forth.  Not so this time, after about 15 minutes I gave up and got out the pliers.  Big no-no for me but..........securely clamped on the outer ring, twisted counter-clockwise it popped free, and no tool marks.  Fine now.

Running a Wen Mac Throttled .049 P1013867
Running a Wen Mac Throttled .049 P1013866
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Post  rsv1cox Fri Aug 19, 2022 7:06 pm

GallopingGhostler wrote: I guess the only downside is the rarity in getting glow heads. Using a glow head plug adapter would bring its power back down to the earlier 1950's engines. (Unless one used it to power a .020 or smaller, light .049 plane - DMECO Kitten.)

I checked both of these glow heads with an ohm meter before trying to run them, not conclusive but an indicator. Both checked open. A little burnishing with steel wool and they were like new again. Oxidation is hard on these Wen's. I wonder how many were tossed because they were thought to be bad.
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Post  GallopingGhostler Fri Aug 19, 2022 9:16 pm

rsv1cox wrote:I checked both of these glow heads with an ohm meter before trying to run them, not conclusive but an indicator.  Both checked open.  A little burnishing with steel wool and they were like new again.  Oxidation is hard on these Wen's.  I wonder how many were tossed because they were thought to be bad.
Bob, in electrical terms, open usually implies that there is no continuity, i.e., open circuit. I think you meant the elements were good, but the cosmetics were bad. Am I correct?

I was referring to continued use, the element finally breaks down. I saw this many times with the Cox engines. New, they glowed a bright orange. When they were near the end of their useful life, they looked eroded and ash-like. What I was referring to, is once the glow heads are gone, do we have a source to get new?

I have purchased a glow head adapter to use glow plugs, but albeit just like the Cox, with less compression, they lose a bit of top end, best for sport engine use on aircraft not demanding full engine performance, or, at their full performance is optimal for that particular aircraft.
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Post  rsv1cox Sat Aug 20, 2022 12:29 pm

Yes, open, no continunity/conductivity but the element was good, just oxidation on the pin preventing electrical flow.  I just cleaned it off, problem solved.  Sort of like burnishing the contact points on your old Ford.  

Wen Mac's seem to be prone to this, not my first time.  A close look at the last picture above shows the build-up. Cox glow heads don't present the same problem.
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Post  Marleysky Sat Aug 20, 2022 2:07 pm

GallopingGhostler wrote:
rsv1cox wrote:I checked both of these glow heads with an ohm meter before trying to run them, not conclusive but an indicator.  Both checked open.  A little burnishing with steel wool and they were like new again.  Oxidation is hard on these Wen's.  I wonder how many were tossed because they were thought to be bad.

When they were near the end of their useful life, they looked eroded and ash-likfind and buye. What I was referring to, is once the glow heads are gone, do we have a source to get new?

I have purchased a glow head adapter to use glow plugs, but albeit just like the Cox, with less compression, they lose a bit of top end, best for sport engine use on aircraft not demanding full engine performance, or, at their full performance is optimal for that particular aircraft.

I've tried the "Kamtechnik"glo head adaptor for use with "turbo plugs", They work great and gave me about 200 more RPM compared to the standard 7810 testors head. The OEM testors heads are getting difficult to find and buy.
https://www.ebay.com/itm/165357735595 or direct from Greg: https://kamtechnik.com/product-category/testors-mccoy/
The big benefit is you can select the turbo plug that best suits your needs..hot to cold.
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Post  rsv1cox Sat Aug 20, 2022 2:41 pm

Thanks Rene, you just cost me $16.43, shipping plus the Governor. I have been meaning to get one for a long time. Just needed a little push. Smile

Bob
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Post  GallopingGhostler Sat Aug 20, 2022 3:14 pm

Thanks for clarifying, Bob, and thanks Rene for the Kamtech option. Glad to see we have excellent cottage industry support for these little jewels.

Bob, you teach me a few new things about these engines and models every day. I guess that whereas Cox used a plated center electric pin for glow continuity, the Testor appears it may be plain steel or other metal subject to age corrosion. (Sort of like us when we age, lose that bright "orange" glow. Laughing ) My Cox engines have been the go-to engines for all my half-A needs. It was only within this most recent decade that I've even played around and purchased Wen-Mac, although did have a Red Head with tank and 8000 that I bought a while back, but more for eye candy to free up the Cox's for use.
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Post  Marleysky Sat Aug 20, 2022 6:33 pm

rsv1cox wrote:Thanks Rene, you just cost me $16.43, shipping plus the Governor.  I have been meaning to get one for a long time.  Just needed a little push.  Smile

Bob
you'll need one of these to:
Nudge, nudge, push, push.....https://www.ebay.com/itm/393311294105  
or maybe    https://www.ebay.com/itm/122143766652  

Whatever spins your prop!!
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Post  rsv1cox Sun Aug 21, 2022 9:45 am

Got me again. I'm going broke on the Marleysky plan.
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Post  andrew Mon Aug 22, 2022 12:49 pm

Marleysky wrote:
you'll need one of these to:
Nudge, nudge, push, push.....https://www.ebay.com/itm/393311294105  
or maybe    https://www.ebay.com/itm/122143766652  

Quit!! I'm going broke saving money!
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