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

Logged in members see NO ADVERTISEMENTS!


Drone Diesel modified for throttle control Cox_ba12





Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Cox Engine of The Month
November-2022
cmulder's

"Throttle and muffler contraption"



PAST WINNERS
CEF Traveling Engine

Win This Engine!
Gallery


Drone Diesel modified for throttle control Empty
Live on Patrol


Drone Diesel modified for throttle control

Go down

Drone Diesel modified for throttle control Empty Drone Diesel modified for throttle control

Post  sosam117 Sun Oct 09, 2022 3:29 pm

A friend (Jack) asked me "if" I could adapt a carburetor onto his Drone diesel?
Two years ago, I was able to adapt a muffler onto the Drone for Jack as where he flies "all" engines are required to have mufflers/silencers.

Well, I told Jack I give it a try.
First thing was to measure the i.d. size of the Drone's venturi. It was just shy of .250" ( less than1/4") at .231 inches.
As the i.d. was a little rough I used an adjustable reamer and reamed the venturi to exactly .250".
That cleaned up the venturi bore to a nice surface finish compared to a rough sand cast finish with black paint.

And while at it, I cleaned up the top face of the venturi so that the face was perpendicular to the venturi bore.

Drone Diesel modified for throttle control 0026_t10

As I was already working on some Enya .09-II engines that were for U-control and I was modifying them to fit throttle valve (carburetors) to them by using Enya .09-III carburetors. But the Enya .09-III carburetor dia.is .321" (about 8mm) so I have been turning the stem part that fits into the venturi down to .250" to fit into the Enya .09 / Enya .09-II engines.
With the venturi on the Enya .09 and Enya .09-II at 1/4" in diameter I tried one of those carburetors into the Drone venturi.

It was a good fit, except the stem was short.
So, I ordered from MECOA the Enya .15/19 carburetor with the long stem.

Drone Diesel modified for throttle control 0007_e10
Drone Diesel modified for throttle control 0008_e10

As luck would have it, the screw holes on the Enya carb were at the exact same length (location) as the original needle valve location on the venturi, so no modifications or extra drilling was necessary.

All I have to do is to turn the carb stem down from the 8mm dia. to the 1/4" diameter.
Below are the before and after of the turning of the carb stem.

Drone Diesel modified for throttle control 0022_c10
Drone Diesel modified for throttle control 0023_c10

After that was done, I made some carburetor gaskets from the thicker Enya gasket sheet (from Bob Brooks) using my punch plug/die for a good fit on the carb.

Drone Diesel modified for throttle control 0027_g10

Now Jack has a throttle for his Drone diesel.
And he can have the throttle arm on either the right side or left side of the engine?

Drone Diesel modified for throttle control 0028_d10
Drone Diesel modified for throttle control 0029_d10
Drone Diesel modified for throttle control 0030_d10

Drone Diesel modified for throttle control 0031_d10
Drone Diesel modified for throttle control 0032_d10
Drone Diesel modified for throttle control 0033_d10


As this was an easy job for once, and it only took less than 3 hours to complete.
sosam117
sosam117
Platinum Member
Platinum Member

Posts : 850
Join date : 2016-03-23
Location : Suburb of Chicago, Illinois

Back to top Go down

Drone Diesel modified for throttle control Empty Re: Drone Diesel modified for throttle control

Post  GallopingGhostler Sun Oct 09, 2022 5:36 pm

Quite a labor of love on that Drone, @sosam117. Glad to see you came up with a practical solution for its R/C conversion, albeit a bit beyond a number of us to be able to do.
GallopingGhostler
GallopingGhostler
Top Poster
Top Poster

Posts : 3529
Join date : 2013-07-13
Age : 68
Location : Clovis, NM, USA

Back to top Go down

Drone Diesel modified for throttle control Empty Re: Drone Diesel modified for throttle control

Post  sosam117 Sun Oct 09, 2022 6:09 pm

Thanks, GallopingGhostler.

I have done many mods on this Drone for Jack.
The contra piston with 2 tygon O-rings on it (top and bottom). Got the tygon O-rings where I use to work at.
I figured "if" the tygon O-rings were acceptable to use on diesel injector casings and stand up to the heat and pressure, it should work on the Drone?

The head Jack got from an old SAM flier out in California.
The modified muffler is a strap on I modified from a MECOA muffler that I purchased.
And the last mod, is the carb addition.

Jack likes the Drone more now compared to how it was as a fix compression, not too noisy, one speed engine.
He says he just needs a little more rpm at take-off then putts around the sky at minimum rpm to keep it flying.
sosam117
sosam117
Platinum Member
Platinum Member

Posts : 850
Join date : 2016-03-23
Location : Suburb of Chicago, Illinois

Back to top Go down

Drone Diesel modified for throttle control Empty Re: Drone Diesel modified for throttle control

Post  getback Mon Oct 10, 2022 7:05 am

Good job on the carb. fit , is the Drone engine a .19 ? Your buddy Jack should bee happy to have a friend to fix him up in the hobby . Thumbs Up
getback
getback
Top Poster
Top Poster

2020 Supporter

2022 Supporter

Posts : 9146
Join date : 2013-01-18
Age : 65
Location : julian , NC

Back to top Go down

Drone Diesel modified for throttle control Empty Re: Drone Diesel modified for throttle control

Post  sosam117 Mon Oct 10, 2022 7:26 am

getback wrote:Good job on the carb. fit , is the Drone engine a .19 ? Your buddy Jack should bee happy to have a friend to fix him up in the hobby . Thumbs Up

The Drone Diesel is of 4.85cc (0.297 cu in) displacement.
sosam117
sosam117
Platinum Member
Platinum Member

Posts : 850
Join date : 2016-03-23
Location : Suburb of Chicago, Illinois

Back to top Go down

Drone Diesel modified for throttle control Empty Re: Drone Diesel modified for throttle control

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