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Cox Engine of The Month
September-2021
crankbndr's

"Cherry Bomb" .051 engine

More info on this engine!




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Post  NEW222 Sat Dec 07, 2019 9:09 am

Funny you should ask. I did weigh it last night just to see myself. As it is, with prop and spinner it is 8.3 ounces. As for what I am doing with it, that is too early to tell, other than bench run it when spring comes.

On another note. Last night after disassembly to put it back together properly, and just a couple drops of 3-in1 oil to lube it, it has a lot of compression, as it should as I am convinced it is still new.
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Post  Ken Cook Sat Dec 07, 2019 9:21 am

The series 21 is a Dykes ringed engine. What that means is the ring is a L shaped ring on the very crown of the piston. The ring fit on some of these examples were hit and miss from brand new. These engines usually didn't provide enough compression when hand flipping to start them if the ring gap or fit was excessive. However, starting with a electric starter will quickly start them. This is due to the ring design, the faster the engine rotates the more the ring expands because of it's design.

The redhead versions were about 1.5 ounces lighter. I personally was never satisfied by the series 21 but I'm fond of the redhead aside of it's shortcomings. This past year at the New Jersey Circle Burners Vintage Combat, a few of us were making the hybrid examples of both engines. Ringed engines use fenced or gated cylinder liners. This just means rather than a continuous exhaust or intake cutout, it's separated by small windows so the ring doesn't come out. The Series 21 piston is a direct fit to the gated Lightning bolt case series redheads. Therefore, you can use the Dykes ringed piston in the redhead but you have to ream the hole in the piston for the wrist pin and make your own wrist pin with end pads. These examples run extremely well and make some pretty good power for what they are.
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Post  GallopingGhostler Sat Dec 07, 2019 10:35 am

@Ken Cook wrote:The redhead versions were about 1.5 ounces lighter. I personally was never satisfied by the series 21 but I'm fond of the redhead aside of it's shortcomings. This past year at the New Jersey Circle Burners Vintage Combat, a few of us were making the hybrid examples of both engines. Ringed engines use fenced or gated cylinder liners. This just means rather than a continuous exhaust or intake cutout, it's separated by small windows so the ring doesn't come out. The Series 21 piston is a direct fit to the gated Lightning bolt case series redheads. Therefore, you can use the Dykes ringed piston in the redhead but you have to ream the hole in the piston for the wrist pin and make your own wrist pin with end pads. These examples run extremely well and make some pretty good power for what they are.
Good inputs from your experiences and training in the combat circles, Ken, thanks for sharing. On http://sceptreflight.com/Model%20Engine%20Tests/Index.html according to Peter Chinn, the Red Head .35 was 7.2 oz. versus the Black Head .35 at 9.6 oz. That is a difference of 2.4 oz.! The Black Head .40 is the same weight as the .35 engine.

Whoever thought that redesigning the crankcase to include more metal without a significant HP increase, especially when Schneurle porting was gaining traction basically spelled the death knell to McCoy engines. (I and my brother bought a slew of CL ones in all sizes from the Hickam AFB, Honolulu hobby shop on sale for $6 each back in 1974.)

I've heard others in forums talk about salvaging parts from the Series 21 to renew the Red Heads. I didn't know about the piston pins / connecting rods required modifying. I heard that one of the Red Heads, parts were a drop in (may be the .19?). Do some reuse the Black Head connecting rods and may be crankshafts, too?

Anyway, I only have one Black Head, the .40. Probably would work on a biplane with short nose like the Fokker Dr. 1 or Sopwith triplane. However, I have enough extra Red Heads and K&B Stallion .35's to suit me for sport flying.
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Post  smooth_bill Sat Dec 07, 2019 6:12 pm

Interesting that the McCoy Logo on the rod is facing correctly. Could that Logo appear on both the front and back (very unlikely)?

Perhaps the wristpin and rod were removed for some reason, and the rod installed incorrectly? That would make it too easy to install the piston backwards.

Bill
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Post  Jason_WI Tue Dec 10, 2019 10:31 pm

So far I have built 8 TDs from this lot.

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F174031166635

I had to add a few spinners and all the glow heads.

Recent engine acquisitions - Page 17 B4382a10



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Post  Cribbs74 Tue Dec 10, 2019 10:52 pm

Looks good! Not bad for the money spent.
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Post  getback Wed Dec 11, 2019 7:56 am

Nice Jason , glad someone on here got it , i bid on it but missed out somehow ? Yes they had good natenual for sure . Small Cox Logo Very Happy Small Cox Logo
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Post  Dave P. Wed Dec 11, 2019 9:18 am

I'm with Eric, I'm glad a friend got it too. I didn't bid but I thought long and hard about it. Great to see what you did with it all.
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Post  63expert Fri Dec 13, 2019 12:35 pm

Recent engine acquisitions - Page 17 22ae4d10
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Post  getback Fri Dec 13, 2019 1:49 pm

Nice K&B Racer Hi Performance ! Did you get that off Ebay? I say one the other day on there first time i had seen one ,i think .
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Post  NEW222 Fri Dec 13, 2019 2:54 pm

@getback wrote:Nice K&B Racer Hi Performance ! Did you get that off Ebay? I say one the other day on there first time i had seen one ,i think .

And I thought the K/B stood for Killer Bee.... Thinking a Killer Bee on steroids. Very Happy
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Post  63expert Fri Dec 13, 2019 3:05 pm

@getback wrote:Nice K&B Racer Hi Performance ! Did you get that off Ebay? I say one the other day on there first time i had seen one ,i think .


It did come from eBay. I’ve wanted one like it since I was a kid, and I finally found one at a reasonable price!
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Post  getback Fri Dec 13, 2019 3:32 pm

cheers cheers cheers Lighting The Tree Win Win !! Are you going to Run it ? If so make a video and post would love to see/hear Her .
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Post  Ken Cook Fri Dec 13, 2019 6:43 pm

Is that the SR series K&B .40? I have the latest examples of the 6.5 RIRE series. One is ABC piston liner configuration and the other has a custom made AAC piston liner. Pretty stout engines and they do run well. I believe that's the engine of choice that Bill Wisniewski used.


I meant rear intake


Last edited by Ken Cook on Sat Dec 14, 2019 7:09 am; edited 2 times in total
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Post  aspeed Fri Dec 13, 2019 7:33 pm

It looks the same as my RIRE .29 that I got straight from Bill for a B Speed plane that I never made. Without going downstairs and taking a pic., here is one, the bigger one in the top centre.Recent engine acquisitions - Page 17 Rrotor11
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Post  gkamysz Wed Dec 18, 2019 1:54 pm

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Post  Marleysky Wed Dec 18, 2019 3:08 pm

Recent engine acquisitions - Page 17 Dca2ba10



Ha-ha!  Someone has a temper-tantrum if they can’t get their pee wee to start!  lol!
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Post  ticomareado Wed Dec 18, 2019 3:25 pm

How many tons on that press?
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Post  NEW222 Wed Dec 18, 2019 4:19 pm

Two things. First is 'WHY?'. Second is that individual should no longer to be able to own or posess a little gem like that again!
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Post  1/2A Nut Wed Dec 18, 2019 4:28 pm

What is worse he did it to two engines..

Recent engine acquisitions - Page 17 S-l16037

Recent engine acquisitions - Page 17 S-l16038
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Post  ticomareado Wed Dec 18, 2019 5:35 pm

Maybe it was someone (or one of their heirs) who used to manufacture 1/2A engines.
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Post  Levent Suberk Wed Dec 18, 2019 6:10 pm

Pistons and crankshafts are missing. I don't buy.
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Post  rsv1cox Wed Dec 18, 2019 6:19 pm

California. In certain parts of that state it's called "art."
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Post  ticomareado Wed Dec 18, 2019 6:25 pm

The NVs look good.
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Post  Levent Suberk Wed Dec 18, 2019 7:06 pm

I never tried to start an engine with a hammer.
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