Wen-Mac/AMF .049 FRV MK XI, running on 30+ Y.O. Sig Champ. 25

roddie Tue Oct 26, 2021 7:46 pm

I ran two model engines this past Sunday the 24th. This Wen-Mac was one.. and a Cox Reed-valve .049 was the other. I aim to focus on the Wen-mac.. because I'd never run one before. This particular engine was given to me by my friend Robert (our CEF member rsv1cox). Robert gifted me a boxful of engines a few years ago.. and this is one of them.

I'll apologize in advance; for my lack of video-editing skills.. but you're sure to enjoy the "tone" of this engine running.. and yes; the fuel I used is ancient.. a testament to Sig fuel and packaging.

https://www.youtube.com/watch?v=HVNUYHjFEkk

Wen-Mac/AMF .049 FRV MK XI, running on 30+ Y.O. Sig Champ. 25 Wen-ma13

Wen-Mac/AMF .049 FRV MK XI, running on 30+ Y.O. Sig Champ. 25 Wen-ma14

The Wen-Mac/AMF/Testors .049 glow-engine has a larger (than Cox) output-shaft, having a male-threaded American Standard Machine-Screw thread-size of 6-32 as compared to Cox's 5-40 female-threaded crankshaft... to accept a prop-screw. Therefore.. if you want to use a Cox .049/.051 OEM (or spec.) propeller.. you would need to enlarge the hub-hole to fit the larger (6-32 threaded) output-shaft on the Wen-Mac/Testors .049 glow-engines.

I chose to test a 5" dia. X 4" pitch 2-blade "DAL" brand propeller.. which is designed for drone/quad-copter applications.

Wen-Mac/AMF .049 FRV MK XI, running on 30+ Y.O. Sig Champ. 25 Wen-ma15

These propellers have a beefy "hub" cross-section; as compared to your garden-variety quad-copter replacement propellers. Always observe applicable safety-procedures when running-up model-propellers to speed. Wear eye-protection/safety-goggles-glasses.

Marleysky Tue Oct 26, 2021 10:15 pm

Nice run video Roddie! I have a couple of Testor/McCoy Engines that really scream!

getback Wed Oct 27, 2021 8:22 am

Good Fun Ma n she really screams , sorry to say i have never ran one (Wen-Mac ) engine myself Smile

Kim Wed Oct 27, 2021 8:25 am

YEAH BOY!!!!!!!!!

roddie Sat Oct 30, 2021 2:23 pm

Marleysky wrote:Nice run video Roddie! I have a couple of Testor/McCoy Engines that really scream!

Thanks Rene! Thumbs Up

It was really good have that engine start and run. I'll be more apt to try running a few others that have found their way to me. Smile

Do you have any models that you run, with your Testors/McCoy engines?

roddie Sat Oct 30, 2021 2:42 pm

getback wrote:Good Fun Ma n she really screams , sorry to say i have never ran one (Wen-Mac ) engine myself

Hey brother Eric, Yes; it was good fun.. right from that first "POP". Shocked

.. you know the one. Then it's just a matter of finding that "sweet-spot".. from "POP" to "CYCLE". Yea.. that took a little time.. but I'm working on being more patient.. because patience is a virtue.. or so they say.

When my flipping-finger got bitten... I went in the house to find a glove. I never tried the engine's integral spring-starter. I guess it's because the FRV engines won't run backwards.. as the reed-valve engines can.. and do.

So... Do you have any FRV Wen-Mac or Testors .049 engines?

roddie Sat Oct 30, 2021 4:28 pm

Kim wrote:YEAH BOY!!!!!!!!!

YaHoo!!! Hey Kim! Those "DAL" 5040 (5"d. X 4"p.) 2-blade drone props have a .1968" (5mm) hub-hole that can be "bushed" using Dubro sm. silicone glow-fuel tubing.. for mounting on most of your 1/2A engines.

Can you suggest a U-control airplane engine-mounting preference for the Wen-Mac/Testors .049 FRV engines? There is a choice between a "beam" and a "firewall" mounting.

Wen-Mac/AMF .049 FRV MK XI, running on 30+ Y.O. Sig Champ. 25 Frv_en10

The "beam-option" seems partially-obstructed by the rear of the crankcase casting..

Ken Cook Sun Oct 31, 2021 7:22 am

The FRV engine as you state can and will run backwards. Yours won't due to the springstarter catching. Flood a front rotary engine and it will run backwards. It won't run well but it does run.

getback Sun Oct 31, 2021 7:45 am

So... Do you have any FRV Wen-Mac or Testors .049 engines? wrote:

Yea man i still got a few i find now and then , Maybee get one loosened up for a run next time out witch want bee long Leaves

rsv1cox Sun Oct 31, 2021 10:55 am

I always enjoy watching one of these "other" engines run.

A few months ago I ran two that sync'd up pretty well.

Thanks for sharing roddie!

batjac Sun Oct 31, 2021 12:39 pm

roddie wrote:
Kim wrote:YEAH BOY!!!!!!!!!

Can you suggest a U-control airplane engine-mounting preference for the Wen-Mac/Testors .049 FRV engines? There is a choice between a "beam" and a "firewall" mounting.

The "beam-option" seems partially-obstructed by the rear of the crankcase casting..

I have done the radial mount on these, and used the Testors/Wen-Mac tank mount for the beam. But one day I got squirrely when I was cleaning up my desk. I had a Wen-Mac engine in one hand and picked up a Brodak 1/2A engine mount in the other hand. Hmmm... So I drilled three holes in the Brodak mount and made a profile Wen-Mac/Testors mount. It works, but the lower screw pokes the fuselage. No biggie, just make sure you fuel proof the fuse there. Also, you have to shave off the offset bump on the Brodak mount or the engine is not only offset to the right, but slightly down.

The Secret Mark

66 Malibu Sun Oct 31, 2021 2:21 pm

Roddie,
Nothing like a screaming .049 to make the worries of the world melt away !!
As mentioned above, the Testors .049 Red Head had a black tank mount similar to the Red Tee Dee .049 mount that would fix you right up.
Unfortunately, I haven't seen one for sell in many years.
Thanks again for allowing us to join the fun albeit at a distance !!!

Steve.....

batjac Sun Oct 31, 2021 5:15 pm

66 Malibu wrote:As mentioned above, the Testors .049 Red Head had a black tank mount similar to the Red Tee Dee .049 mount that would fix you right up.
Steve.....

The great thing about those Testors tank mounts vs. the Cox tank mounts: The red Cox tank mount had the fuel pickup at the bottom right of the tank, so it was only good for upright flying, whereas the Testors tank mount was stunt vented so it could be flown upside down.

The Inverted Mark

roddie Mon Nov 01, 2021 7:22 pm

Whoa......... !!! Thanks soOoOo much for the replies. I don't know bout' the rest of you; but I've got this headwind that won't quit. Tryin' to rise above it though. Smile

Regarding that Wen-Mac/Testors .049 FRV engine mount......... I've never seen one of those aux. mounts. These engines (I think..) are heavier than any of the Cox Bee/reed-valve engines.. so if I were to design or modify a model; I'd bee inclined to mount the engine rearward a bit. This engine ran good and drew fuel well with it's cylinder in an upright attitude. I'm leaning toward mounting it that way. I can make a radial firewall thick-enough to accept the X3 wood-screws. It may be back near to the wing's leading-edge.. but that's OK. I generally build/design my airplanes to utilize landing-gear; affording some balance-options.

Marleysky Mon Nov 01, 2021 9:21 pm

Here's one from Ol George Galloping Ghoster from a few threads back:

Wen-Mac/AMF .049 FRV MK XI, running on 30+ Y.O. Sig Champ. 25 Testor10

I have mine mounted on a "Big Otto" by the 3 radial mounting screws. This plane was the first model I covered with Monocote, chrome monocote to be exact. The engine vibrations set up a frequency that vibrated the monocote while flying giving the plane a real "Mean" growl while in the air.

Oldenginerod Tue Nov 02, 2021 2:16 am

Unfortunately these tank mounts are very thin in the beams adjacent to the rear radial mount. This causes quite a bit of flex in the beams. Care when starting and a well balanced prop should overcome these issues.

roddie Tue Nov 02, 2021 5:31 pm

Same session.. (later...) Cox .049 Babe Bee reed-valve engine, modified for the same -external- #2 Perfect-brand 3/8oz. wedge/stunt tank. 5"d. X 3.5"p. L/H 3-blade Cox propeller, same Sig "Champion 25" 30+ Y.O. glow fuel. This engine was castor-locked and needed a little heat-gun treatment to free-up but minimal. My homemade muffler is installed. It has a single/full-flowing header installed. Being minimally restrictive; there isn't much noise reduction.. but it does take the "bite" out of the exhaust tone. It's possible to do an exhaust-prime via the header-pipe.. I just didn't do it.

I got a bunch of those little Tin Perfect brand wedge-tanks from Dan McEntee a few years back. I've always liked them.

url=https://www.youtube.com/watch?v=rMbnSt7u9s0]https://www.youtube.com/watch?v=rMbnSt7u9s0[/url]

roddie Tue Nov 02, 2021 5:48 pm

Marleysky wrote:Here's one from Ol George Galloping Ghoster from a few threads back:

I have mine mounted on a "Big Otto" by the 3 radial mounting screws. This plane was the first model I covered with Monocote, chrome monocote to be exact. The engine vibrations set up a frequency that vibrated the monocote while flying giving the plane a real "Mean" growl while in the air.

I'd never seen one of those. Thanks for posting. Yea.. "Kim Stricker's" Big Otto was also the first I'd ever seen. I'll likely use the 3-screw radial mount as you did in yours. I'm OK with using Wood-screws.. as long as they're biting all the way into good firm hardwood.

chevyiron420 Mon Nov 22, 2021 12:04 pm

roddie wrote:
Marleysky wrote:Nice run video Roddie! I have a couple of Testor/McCoy Engines that really scream!

Thanks Rene! It was really good have that engine start and run. I'll be more apt to try running a few others that have found their way to me. Do you have any models that you run, with your Testors/McCoy engines?

Here is one of mine.

Wen-Mac/AMF .049 FRV MK XI, running on 30+ Y.O. Sig Champ. 25 Img_0226

roddie Sun Nov 28, 2021 9:06 am

Hey Phil! Thanks for posting. I saved some photos of that F-86.. was it built back in 2015?

Wen-Mac/AMF .049 FRV MK XI, running on 30+ Y.O. Sig Champ. 25 Img_0210

Wen-Mac/AMF .049 FRV MK XI, running on 30+ Y.O. Sig Champ. 25 Img_0211

chevyiron420 Wed Dec 01, 2021 10:31 pm

It probably was roddie. I loose track of time.

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Wen-Mac/AMF .049 FRV MK XI, running on 30+ Y.O. Sig Champ. 25

Wen-Mac/AMF .049 FRV MK XI, running on 30+ Y.O. Sig Champ. 25

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Re: Wen-Mac/AMF .049 FRV MK XI, running on 30+ Y.O. Sig Champ. 25

Re: Wen-Mac/AMF .049 FRV MK XI, running on 30+ Y.O. Sig Champ. 25

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Re: Wen-Mac/AMF .049 FRV MK XI, running on 30+ Y.O. Sig Champ. 25