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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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And another geared twin is born... Empty And another geared twin is born...

Post  kaintuck Fri Mar 17, 2023 6:11 pm

And another geared twin is born... 944-A71-F9-BA44-4-BEC-80-F0-5-E779-A75-A89-F And another geared twin is born... 6406-AFCF-9-AE7-4-FD2-A93-A-162-B226-B5-CAB And another geared twin is born... 1-A431172-99-BB-4-CA0-87-C6-237-E3-E7-FABDF And another geared twin is born... 6-CBD410-F-80-DA-4582-A916-EE6697-AE0-B52 And another geared twin is born... 692607-DD-8598-4-AAB-A7-CF-C97-A090-A7363

Build for a friend.....he supplied the motors....I did the elbow grease...
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And another geared twin is born... Empty hex bolt?

Post  cmulder Fri Mar 17, 2023 6:21 pm

Is it a standard hex bolt as prop shaft?
It appears could be made just a drill press and then press fit the bearrings (spacer in between?)
What gear ratio does it have and where did you get the gears ?
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Post  getback Sat Mar 18, 2023 7:27 am

Looks Good ! Is he going to fly it ? Shamrock
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Post  kaintuck Wed Mar 22, 2023 4:31 pm

cmulder wrote:Is it a standard hex bolt as prop shaft?
It appears could be made just a drill press and then press fit the bearrings (spacer in between?)
What gear ratio does it have and where did you get the gears ?

yes...standard ACE hardware hex 1/4" bolt.
the gears can be anything you want, as long as you clear the Timkins 1/4" bore bearing in the middle!
I'm at work now, but i think the 48P gears are 18T and 35T...(let me write it down to come back and list) but your gears from the R/C car places....commercial gear will be upwards of $ bucks a piece!!!!!!....these gear are steel, cost total of 30 bucks. you will need to drill the main gear to exactly -.005 or so bearing bore size....then i bought a reamer off amazon for 8 bucks....
next one i will use 32P gears...more 'meat', bigger is easier to get the backlash good......
i got enough aluminum to built couple of dozen, i might just but some new blocks, and make a few...sell them cheap enough for you fellows to buy, and get some of my 'tooling' costs back....think anybody would be interested?
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And another geared twin is born... Empty loads of scale potentional

Post  cmulder Wed Mar 22, 2023 4:58 pm

This could look and sound greath on a piper cub.
Would you be able to post a video of them running? the sound alone should sell a few Wink
They fire 180 degrees from each other?

Another aplication would be using the new crankcases, killer bee crankshaft/backplate and td top end.
Then you can run them at high rpm and still have a more efficient slower turning big prop.
That should outperform engines like the os .10 la and look a lot better.
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And another geared twin is born... Empty gears

Post  kaintuck Thu Mar 23, 2023 8:34 am

i looked: they are...#8258 21T 48P and#PHB48P5MM 35T
they started out opposite...but with those odd teeth, i think they will kinda 'rotate' in firing~next gear set, i'll get even teeth numbers, and 32P!

or:get 2 of these:
https://www.amainhobbies.com/traxxas-32p-heavy-duty-pinion-gear-20t-tra3950x/p717136?v=717136

and one of these:
https://www.amainhobbies.com/hot-racing-traxxas-unlimited-desert-racer-32p-steel-pinion-gear-w-5mm-bore-34t-hransg3234/p860084?v=827263&gclid=EAIaIQobChMIp-TLu57y_QIVVAatBh3JCwowEAQYDyABEgI0hfD_BwE

send me these gears, with 2 cox motors with this type of front end: Cox .049 / .051 Crankcase - Silver SKU: 4900CCS and for 50 bucks i'll make you a twin like i made James...
i've got the aluminum bar stock and bearings and set screws, the drill bits and reamers is what cost me~!..and i've got time........ Very Happy
marc
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