Log in
Search
Latest topics
» my attempt at making an exhaust throttle for Cox .049by balogh Today at 12:07 am
» Testers Sprite engine swap
by Greenman38633 Yesterday at 9:32 pm
» Elfin 0.5cc (Arnie Hende replica)
by dan vincent Yesterday at 9:18 pm
» Introducing our Cox .049 TD Engines
by layback209 Yesterday at 9:10 pm
» Anderson Baby Spitfire - looking for the aft tank and gasket
by Boats13 Yesterday at 8:18 pm
» Fuel residue stain clening help
by akjgardner Yesterday at 7:53 pm
» Another of C.T. engines cleaned ---- Cox Tee Dee .09 --- Just today (3/26/2024) more Cox parts
by sosam117 Yesterday at 5:55 pm
» Cox powered boat litle shrimp hidroplane
by davidll1984 Yesterday at 2:52 pm
» Introducing the new - "QZ" RR-1
by roddie Yesterday at 1:08 pm
» STUKA bomb dimentions needed
by latole Yesterday at 9:36 am
» Indexing COX cylinders
by davidll1984 Yesterday at 7:56 am
» 1/2a Skyray plans?
by 944_Jim Wed Mar 27, 2024 10:14 pm
Basic maintenens and performance
Page 1 of 1
Basic maintenens and performance
I just wanted to know if i could use olive oil as a after run oil.
Why can't we use synthetic oil in our cox engines.
What is a good size plane for a cox 049killer bee.
Can I use olive oil instead of castor in fuel.
Thanks in advance
Tim.
Why can't we use synthetic oil in our cox engines.
What is a good size plane for a cox 049killer bee.
Can I use olive oil instead of castor in fuel.
Thanks in advance
Tim.
Pin head- Guest
Re: Basic maintenens and performance
I'll answer with what I've learned from modelers who have a much better background in engineering and lubrication than I do. As I understand it, castor oil has a lot of properties that no other oils have. Those are the same reasons why 2-stroke motorcycle racers use it in their engines. Aside from being a good lubricant, it has a high smoke point, higher than even many synthetics. Rather than burning off in combustion, it mostly passes through and exits the exhaust carrying heat with it, thereby regulating the engine's temperature. Without it the engine would not have the ability to radiate heat fast enough to prevent destroying itself. The portion of castor that does reach a critical temperature, rather than burning off, turns to a varnish that deposits a protective layer that prevents wear of load bearing surfaces.
One of these in particular in the Cox engines is the ball socket that connects the connecting rod with the piston. It must have a varnish coating to lessen friction and prevent it from eating itself in short order. This is the main weak point of Cox engines. The ball socket still needs to be tightened with a reset tool after breaking in, and sometimes after an engine has been run in a high performance manner. The varnish also prevents premature wear of the piston and cylinder. Olive or other vegetable oils would not be up to the job.
Modern synthetics make a good addition if mixed 50/50 with castor. They reduce excessive varnishing and have even better lubrication properties. The best after run oils are air tool oil with additives that neutralize the leftover combustion compounds that would otherwise oxidize and corrode the engine's internals.
Any 1/2A control line. kits with wing areas in the 100-200 square inch range are good for a Killer Bee. That's probably one of the best Cox reed valve engines ever. RC and Free Flight planes can have much larger wing areas if they are light and floaty.
Here are some examples of C/L models:
http://brodak.com/control-line-kits/brodak/1-2-a-series.html
There's more. I'll get back to it later if someone doesn't continue. Welcome to CEF
Rusty
One of these in particular in the Cox engines is the ball socket that connects the connecting rod with the piston. It must have a varnish coating to lessen friction and prevent it from eating itself in short order. This is the main weak point of Cox engines. The ball socket still needs to be tightened with a reset tool after breaking in, and sometimes after an engine has been run in a high performance manner. The varnish also prevents premature wear of the piston and cylinder. Olive or other vegetable oils would not be up to the job.
Modern synthetics make a good addition if mixed 50/50 with castor. They reduce excessive varnishing and have even better lubrication properties. The best after run oils are air tool oil with additives that neutralize the leftover combustion compounds that would otherwise oxidize and corrode the engine's internals.
Any 1/2A control line. kits with wing areas in the 100-200 square inch range are good for a Killer Bee. That's probably one of the best Cox reed valve engines ever. RC and Free Flight planes can have much larger wing areas if they are light and floaty.
Here are some examples of C/L models:
http://brodak.com/control-line-kits/brodak/1-2-a-series.html
There's more. I'll get back to it later if someone doesn't continue. Welcome to CEF
Rusty
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
Similar topics
» Cox Handy Reel Instructions Wanted
» Looking for: Easy to build basic RC airplane plans
» Brodak CL Basic Trainer 049
» Looking for: Easy to build basic RC airplane plans
» Brodak CL Basic Trainer 049
Page 1 of 1
Permissions in this forum:
You cannot reply to topics in this forum