Cox Engines Forum
You are not logged in! Please login or register.

Logged in members see NO ADVERTISEMENTS!


And another geared twin is born... Cox_ba12




And another geared twin is born... Pixel

Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» +971528536119 Get safe good and effective Abortion pills for termination of unwanted pregnancy in Dubai,and Abu Dhabi
by Jamam Today at 8:01 am

» 971528536119 )#Buy Abortion Pills in Dubai ..,BUY (CYTOTEC) PILLS IN Dubai abort
by Jamam Today at 7:57 am

» Project Cox .049 r/c & Citabrian Champion
by getback Today at 7:56 am

» "Me and Crazy Horse...Our Anniversary"
by getback Today at 7:39 am

» **Black Lynx Engine Giveaway** Cox Engine of the Month (2023)
by getback Today at 7:00 am

» Original Box for P-51 Bendix Trophy Racer Value
by getback Today at 6:51 am

» OS 10FSR Carb Needed
by davidll1984 Today at 6:40 am

» Cox P-51 Bendix Trophy Racer
by Wayne Brown Yesterday at 5:39 pm

» thread measurements
by MauricioB Yesterday at 5:33 pm

» Cox Thompson Trophy Winner
by Jerry Yesterday at 5:20 pm

» COX 010 TeeDee with RC carb, courtesy sosam 117
by rdw777 Yesterday at 3:08 pm

» a cheap sport muffler
by robot797 Yesterday at 1:34 pm

Cox Engine of The Month
March-2024
balogh's

"COX Budapest" .049 engine



PAST WINNERS
CEF Traveling Engine

Win This Engine!
Gallery


And another geared twin is born... Empty
Live on Patrol


And another geared twin is born...

Go down

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...
kaintuck
kaintuck
Beginner Poster
Beginner Poster

Posts : 8
Join date : 2019-03-14

Back to top Go down

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 ?
cmulder
cmulder
Gold Member
Gold Member

Posts : 279
Join date : 2022-02-10

Back to top Go down

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

Post  getback Sat Mar 18, 2023 7:27 am

Looks Good ! Is he going to fly it ? Shamrock
getback
getback
Top Poster
Top Poster

2022 Supporter

2023 Supporter

Posts : 10015
Join date : 2013-01-18
Age : 66
Location : julian , NC

Back to top Go down

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

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?
kaintuck
kaintuck
Beginner Poster
Beginner Poster

Posts : 8
Join date : 2019-03-14

Back to top Go down

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.
cmulder
cmulder
Gold Member
Gold Member

Posts : 279
Join date : 2022-02-10

Back to top Go down

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
kaintuck
kaintuck
Beginner Poster
Beginner Poster

Posts : 8
Join date : 2019-03-14

Back to top Go down

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

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum