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Cox Engine of The Month
February-2024
1/2A Nut's

"RC Speed Boat Power Drive TD .020"

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Post  roddie Mon Dec 11, 2023 9:37 pm

rdw777 wrote:You bet, Will make a couple up  Thumbs Up …. The photo shows the front end of SBJ with the 5-40 nut on… I happen to have one Very Happy…. I tried to scheme out a flywheel but no bueno…. Maybe a local machine shop could make them…


I mentioned earlier; the Dumas model boat running-hardware kits for 1/2A glow power.. and asked about the SB/SBJ thread-pitch on the output-shaft. Bob confirmed the 5-40.. as is in all the later Cox .049/.051 engines. The Dumas kits came with the flywheel.. (#6 center-hole must be bushed for 5-40 to avoid eccentricity leading to imbalance) and includes a Universal-joint which is internally threaded 5-40 in the hex-end.. and includes a steel shaft; threaded to mate with the u-joint's opposite end. These kits were complete... and some were meant for installation in their then; "Atlas Van-Lines" Hydroplane kit for either "free" or "tether" running.

Some photos..

the Dumas U-joint/flywheel assy that came in my kit # 2306

Space Bug Jr. - Trying to determine just how stupid I want to get - Page 2 Dumas_17

an example photo from the web, showing installation on a Babe Bee.. to power a Dumas AVL Hydro (18" length)

Space Bug Jr. - Trying to determine just how stupid I want to get - Page 2 Dumas-10

Dumas still offers those kits..

https://www.dumasproducts.com/?product=running-hardware-kit-2314-for-1209-1410-1411-1422

Space Bug Jr. - Trying to determine just how stupid I want to get - Page 2 Dumas_18

I have 5-40 hex-nuts that I can send to Bob.. which might help to fit a flywheel/U-joint assy. from that Dumas running hdwe. kit.
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Post  rsv1cox Tue Dec 12, 2023 8:25 am

Looks like I have those Dumas universals coming roddie.

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Post  rsv1cox Tue Dec 12, 2023 8:43 am

I got the Franken Space Bug/Space Bug Jr. together this morning using Mudhen's crankshaft, Space Bug crankcase, and SB Jr.'s plastic tank and accessories.  Mud sent  a new prop drive washer too which I pulled on with a couple of toothpicks and nuts.  Not fun getting those little ground off 2/56 nuts back on the bolts.  

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After I tightened the head I got a nice "it's going to run" pop flipping the yellow safety tipped prop.  

Yesterday I ordered a bunch of parts from both Bernie and Matt.  Got to wait on assembling the "authentic" SB Jr. until I get new case gaskets.  

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Post  rsv1cox Fri Dec 22, 2023 2:57 pm

I got Bernies SBJr. parts in today, Matt's on the way. Enough to keep the little gems running for years to come. Bernie included a little keychain thingy that will find it's way into my CEF coffee cup.

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Post  GallopingGhostler Sat Dec 23, 2023 8:01 am

That rubber tipped key chain thingy, got the same from Bernie for an order I placed not long ago. It is a touch pointer clicker for a cellphone or tablet touch screen.
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Post  rsv1cox Sat Dec 23, 2023 8:32 am

GallopingGhostler wrote:That rubber tipped key chain thingy, got the same from Bernie for an order I placed not long ago. It is a touch pointer clicker for a cellphone or tablet touch screen.

Thanks George, just got back from an early morning shopping trip and picked it up........pressed the black rubber tip and .... "Well, it's not a flashlight or lazer pointer"......... Huh...
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