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Cox Engine of The Month
July-2024
robot797's
![](https://i.servimg.com/u/f95/15/46/86/41/3_robo10.jpg)
"ULTIMITE COX 010: it has a clutch, E starter, throttle, exhaust, aluminum tank, aluminum venturi, gearbox with forward and reverse, and now its on a custom drawn and printed stand"
![](https://i.servimg.com/u/f95/15/46/86/41/sponso12.png)
PAST WINNERS
robot797's
![](https://i.servimg.com/u/f95/15/46/86/41/3_robo10.jpg)
"ULTIMITE COX 010: it has a clutch, E starter, throttle, exhaust, aluminum tank, aluminum venturi, gearbox with forward and reverse, and now its on a custom drawn and printed stand"
![](https://i.servimg.com/u/f95/15/46/86/41/sponso12.png)
PAST WINNERS
Recent engine acquisitions
Page 17 of 20
Page 17 of 20 • 1 ... 10 ... 16, 17, 18, 19, 20
Re: Recent engine acquisitions
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.
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.
NEW222- Top Poster
- Posts : 3895
Join date : 2011-08-13
Age : 45
Location : oakbank, mb
Re: Recent engine acquisitions
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.
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.
Ken Cook- Top Poster
- Posts : 5542
Join date : 2012-03-27
Location : pennsylvania
Re: Recent engine acquisitions
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.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.
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.
GallopingGhostler- Top Poster
Posts : 5432
Join date : 2013-07-13
Age : 70
Location : Clovis NM or NFL KC Chiefs
Re: Recent engine acquisitions
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
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
smooth_bill- Gold Member
- Posts : 229
Join date : 2012-02-19
Age : 87
Location : Beaverton, OR
Jason_WI- Top Poster
Posts : 3123
Join date : 2011-10-09
Age : 49
Location : Neenah, WI
Re: Recent engine acquisitions
Looks good! Not bad for the money spent.
Cribbs74- Moderator
Posts : 11904
Join date : 2011-10-24
Age : 50
Location : Tuttle, OK
Re: Recent engine acquisitions
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](/users/3015/29/34/60/smiles/7356.png)
![Very Happy](https://2img.net/i/fa/i/smiles/icon_biggrin.png)
![Small Cox Logo](/users/3015/29/34/60/smiles/7356.png)
getback- Top Poster
Posts : 10276
Join date : 2013-01-18
Age : 66
Location : julian , NC
Re: Recent engine acquisitions
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.
Dave P.- Gold Member
- Posts : 477
Join date : 2017-07-31
Age : 66
Location : Durham, NC
Re: Recent engine acquisitions
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 .
getback- Top Poster
Posts : 10276
Join date : 2013-01-18
Age : 66
Location : julian , NC
Re: Recent engine acquisitions
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](https://2img.net/i/fa/i/smiles/icon_biggrin.png)
NEW222- Top Poster
- Posts : 3895
Join date : 2011-08-13
Age : 45
Location : oakbank, mb
Re: Recent engine acquisitions
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!
63expert- Bronze Member
- Posts : 38
Join date : 2014-02-10
Re: Recent engine acquisitions
![cheers](https://2img.net/i/fa/i/smiles/icon_cheers.png)
![cheers](https://2img.net/i/fa/i/smiles/icon_cheers.png)
![cheers](https://2img.net/i/fa/i/smiles/icon_cheers.png)
![Lighting The Tree](/users/3015/29/34/60/smiles/3576973867.gif)
getback- Top Poster
Posts : 10276
Join date : 2013-01-18
Age : 66
Location : julian , NC
Re: Recent engine acquisitions
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
I meant rear intake
Last edited by Ken Cook on Sat Dec 14, 2019 7:09 am; edited 2 times in total
Ken Cook- Top Poster
- Posts : 5542
Join date : 2012-03-27
Location : pennsylvania
aspeed- Platinum Member
- Posts : 790
Join date : 2013-01-18
Location : Leamington Ont. Can.
Re: Recent engine acquisitions
https://www.ebay.com/itm/372879599363
Anyone interested?
Anyone interested?
gkamysz- Gold Member
- Posts : 390
Join date : 2018-02-22
Location : Chicagoland
Marleysky- Top Poster
Posts : 3618
Join date : 2014-09-28
Age : 71
Location : Grand Rapids, MI
Re: Recent engine acquisitions
How many tons on that press?
ticomareado- Account Under Review
- Posts : 1089
Join date : 2013-10-03
Location : NC
Re: Recent engine acquisitions
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!
NEW222- Top Poster
- Posts : 3895
Join date : 2011-08-13
Age : 45
Location : oakbank, mb
1/2A Nut- Top Poster
- Posts : 3464
Join date : 2013-10-20
Age : 60
Location : Brad in Texas
Re: Recent engine acquisitions
Maybe it was someone (or one of their heirs) who used to manufacture 1/2A engines.
ticomareado- Account Under Review
- Posts : 1089
Join date : 2013-10-03
Location : NC
Levent Suberk- Diamond Member
- Posts : 2228
Join date : 2017-12-24
Location : Türkiye
Re: Recent engine acquisitions
California. In certain parts of that state it's called "art."
rsv1cox- Top Poster
Posts : 10851
Join date : 2014-08-18
Location : West Virginia
Re: Recent engine acquisitions
The NVs look good.
ticomareado- Account Under Review
- Posts : 1089
Join date : 2013-10-03
Location : NC
Re: Recent engine acquisitions
I never tried to start an engine with a hammer.
Levent Suberk- Diamond Member
- Posts : 2228
Join date : 2017-12-24
Location : Türkiye
Page 17 of 20 • 1 ... 10 ... 16, 17, 18, 19, 20
![-](https://2img.net/i/empty.gif)
» My recent engine purchase
» Recent experience with Norvel?
» AMA membership
» Recent kit build…
» My recent disaster
» Recent experience with Norvel?
» AMA membership
» Recent kit build…
» My recent disaster
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