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Cox Engine of The Month
October-2024
MauricioB's

"Cox .049 Circa 1975, custom."



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Cox .020 PeeWee/TeeDee prop-screw Empty Cox .020 PeeWee/TeeDee prop-screw

Post  roddie Thu Sep 26, 2024 4:23 pm

It's a size 3-48 UNC machine-screw. Now for my story; Up until this past week, I'd never owned a model engine smaller than .049 cu.in. I'd never even "held one" in my hand.. then I got a letter from my brother from another mother.. "Eric" (@getback) telling me that something was coming in the mail... but he didn't let-on as to what it was..

Cox .020 PeeWee/TeeDee prop-screw _cox_p10

cheers Very Happy cheers Very Happy cheers Very Happy A PeeWee!!!!

Cox .020 PeeWee/TeeDee prop-screw 20240945

There's something about a handwritten letter...  Smile  So it just needed a prop-screw.

I have a stock of 3-48 X 1" length cap-screws (black oxide coated) so I cut a few to the required length. This engine's crankshaft bore had a depth of close-to 3/8" (10mm).. but I found that the 3-48 threads weren't tapped nearly that deep. Just-over 1/4" or maybe 7mm.

Cox .020 PeeWee/TeeDee prop-screw 3-48_p11

My screw kept running-out of threads before the propeller would tighten up..  What?

Cox .020 PeeWee/TeeDee prop-screw 3-48_p1089

I didn't have any flat-washers the correct size (which naturally bothered me..  Rolling Eyes  ) so I came up with an unlikely adaptation. I have a stock of 3-48 lock-nuts.. so I decided to drill-out the threaded (steel) section to receive the body of my 3-48 cap-screws (.098") and then drilled-out the plastic (lock) part of the nut to receive the screw-head.. (.159") which provided a consistent bearing-surface on the prop-hub.. when snugged-up.

Cox .020 PeeWee/TeeDee prop-screw 3-48_p12

Cox .020 PeeWee/TeeDee prop-screw 3-48_p13

That's gonna' work just fine.. and I like the look.. Cool
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Post  rsv1cox Thu Sep 26, 2024 6:27 pm

Good for Eric filling a void with a nice shiney Cox Pee Wee engine. And a great fix on the prop screw. Winners all the way around.
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Post  GallopingGhostler Thu Sep 26, 2024 11:11 pm

Roddie, the prop screw fix looks real good, almost scale like, looks like that .020 has potential for a Cox Engine of the Month winner. Very Happy
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Post  balogh Fri Sep 27, 2024 1:54 am

Bernie of COX International sells socket head screws of the required dimensions for engine mounting purposes, and I replaced the slot round headed  stock screw on my COX TeeDee020 with a socket head screw,  that allows better tightening of the prop than the stock...I do not have any screws with American thread sizes here in our hardware stores..

https://coxengines.ca/mounting-screws/cox-049-engine-mounting-3-48-x-1-2-socket-head-screws-3-4.html

Only 1/2" long instead of 3/4", so will not work with a spinner, but just long enough for the  hubs of props for 020 engines.
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Post  rdw777 Fri Sep 27, 2024 2:48 am

What a kind gesture by Eric, Those kinds of things will never be forgotten!!!….

You’ll enjoy the PeeWee Roddie…. Special little jewels with a lot of potential!! Small Cox Logo
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Post  getback Fri Sep 27, 2024 7:36 am

Hey roddie , glad you had some screws to make it work looks like it will work just fine Very Happy I know you said a few times you didn't have a Pee Wee soooooo now you do . cheers
Bee sure to take a vedio when you run it
Now you can find anther project for it fun all the way around Hand Shake
PS Roddie had sent me a bunch of goodies also I had the stuff out and forgot to take any pictures DAMMIT! I will pretty soon though going to need to et some things out of the box Old Bugger
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Post  roddie Fri Oct 04, 2024 10:20 pm

Got some .020 items coming from Canada. Now that I have this engine; I'm going to want to try to support its longevity. I feel a "click when I flick".. when turning-over the prop.. that makes me want to check the piston-rod's ball/socket joint. Makes sense to have that tool to reset it if needed. I already have the .049 and .09 versions.

Here's a list of what I ordered.. which I figured was good to start with...

Cox .020 PeeWee/TeeDee prop-screw Cox_in10

Oh yea.... regarding the Cox Apache (autogyro) rotor.. Shocked.... It's to try on my "Rodd-O-Gyro"... someday.. (why not?)
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Post  getback Sat Oct 05, 2024 7:55 am

Thats Good you got some inventory for the little one . Very Happy
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Post  roddie Sat Oct 12, 2024 9:21 pm

I got my Cox .020 parts from Cox International yesterday.

Cox .020 PeeWee/TeeDee prop-screw Cox_in11

I had a feeling that the piston-rod/socket joint might need a reset.. so I disassembled the engine to get a better feel.

Cox .020 PeeWee/TeeDee prop-screw 20241011

There was a little end-play.. and I generally reset it for ZERO.. but not to the point of binding. I now had the tool.. and used it today. I'm happy with the result.

Cox .020 PeeWee/TeeDee prop-screw 20241013

The reed wasn't sealing.. so I removed it to inspect.. and there was a slight crease; enough to prevent it from sealing properly.

Not easy to see without a magnifier...  Check with own eyes   Clean my glasses

Cox .020 PeeWee/TeeDee prop-screw 20241017

Cox .020 PeeWee/TeeDee prop-screw 20241010

I used the new fuel tank-service kit.. which came with a Mylar reed (star-shape) and new circlip. Incidentally; the circlip that was in the engine is .0195" dia. wire. The new circlip wire is .0235" diameter. I decided to use all the new parts that came in the tank service kit. The reed is seating correctly now with the new parts. I'm glad that I bought the tank service-kit because the engine had 2 tank-screws that were shorter than stock.. and also were "round-headed". They're all nice and new now. The backplate to tank-bowl seat is in good shape.. as is the backplate's "overall" condition.. so I don't expect to see any leaking.

Cox .020 PeeWee/TeeDee prop-screw 20241016

Cox .020 PeeWee/TeeDee prop-screw 20241014

I like the silver tank bowl. Makes me want to polish/buff-out all of my 5cc (.049) bowls.

Cox .020 PeeWee/TeeDee prop-screw 20241015

I installed X2 head gaskets because I will be using 25/35% nitro glow-fuels. Compression feels very good.


Last edited by roddie on Sat Oct 12, 2024 9:22 pm; edited 1 time in total (Reason for editing : edited post title)
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Post  getback Sun Oct 13, 2024 7:26 am

Hey man , I am glad you went ahead in to it , don't remember going in to that one but probably did at one time .
I think it would have run but sure didn't mean to sent something hard to run !
Or maybe its just a test for your skills lol! Beer Cheers
Old Bugger I know my eyes have been messing with me lately and tring different contacts and all ,but i got a appt. coming up and I will tell them about this problem . Check with own eyes Very Happy
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Post  roddie Sun Oct 13, 2024 9:17 am

getback wrote:Hey man , I am glad you went ahead in to it , don't remember going in to that one but probably did at one time .
I think it would have run but sure didn't mean to sent something hard to run !
Or maybe its just a test for your skills lol! Beer Cheers
Old Bugger  I know my eyes have been messing with me lately and tring different contacts and all ,but i got a appt. coming up and I will tell them about this problem . Check with own eyes Very Happy
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I didn't really have anything Cox .020 related until you sent me that engine Eric. I was anxious to "open it up" once I received the .020 related items from Bernie.. (mainly the piston reset tool...) so going through it just seemed like the logical thing to do.

New CEF member Loosespinner99 (Dave) is rebuilding his "new to him" Pee Wee .020 and I brought up/posted the creased-reed issue/photos partly for his benefit.. but also for others to understand; how a very slight deformity can prevent its proper function.

It's a nice little engine Eric.. and I feel very lucky to have it.

DON'T feel sorry about anything man.

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