Cox vs OK

[Phil Coopy]

How would the power output of a OK .049 compare with a Cox Golden Bee.049? Got an OK .049B and for nostalgia sake want try it out in place of a Cox. Worth a try?

Phil

[Bill Heher]

The OK is a bit less powerful than a single port Cox in my experience, and a noticable bit less than a dual port like a Super bee or black Widow.

But they are still a good running little engine, and the ability to firewall mount without an extra 1/2 " of backplate can be helpful in 1/2A planes that tend to be nose heavy anyway. Get yourself a Walt Musciano designed " Hollow Log" series kit from Black Hawk model and have some fun.  Maybe you will enjoy it enough to host a Musciano event - I would try my darndest to make it over for that.

Hey- are you gonna be doing anything for the Ringmaster fiesta in early oct. There is another post about it- trying to get as many people flying Ringmasters in as many places as possible on 1 weekend. I am supposed to be home that week and would sure like to get a few flights in.

[ray copeland]

Phil,  IMO  it all depends on what you want to do with the airplane, just go in circles for training, or do some serious stunting. The Ok cub seems to be balanced for low rpm's, maybe the 5x3 or 6x3 prop. When i put a smaller cut down prop on the ok's they will vibrate too much to pick up fuel.  Although i did my first loops with an OK Cub b. The Golden Bee is what we use for trainer planes to learn loops , not too much else without  routing an external fuel tank.  To go inverted with the Golden Bee the fuel pickup has to be set up right, and in my experience is hard to get the same runs every time on inverted unless you do those moves early in the flight. For level flying we have some GB's that have been flown and crashed a "bunch" of times and fire right back up and go.  I love the way both engines sound and i still fire them up from time to time, just not much power compared to an ap wasp or norvel.

[George]

How would the power output of a OK .049 compare with a Cox Golden Bee.049? Got an OK .049B and for nostalgia sake want try it out in place of a Cox. Worth a try?

Phil

Phil,

If you want something nostalgic perhaps a VECO Scout would be in order. Fully built up and sized for the original OK Cub (.049, predecessor of the .049B). It uses a firewall mount, has a simple built-up wing and a box fuselage.

Running OK Cubs: They are low compression iron/steel engines. I would suggest ~25% nitro, 22%-25% all castor lubed fuel. Some Cubs have a too-blunt needle (rich to lean in 1/2 turn). If so, file some taper on the needle. If it is new, break it in like any other iron/steel and it will be all it can be. If you don't, it will still work - just not as long, nor as well.

Good luck.

George

[Larry Renger]

In my experience, it is worth unscrewing the cylinder from the engine and inspecting the bypass ports.  There are often burrs that limit the flow through the bypass holes.  An X-acto knife will remove the burrs and can even be used to chamfer the entry to the bypasses for smoother inflow.

Agree that higher nitro is required, but add that a hot range plug is a must!

[john e. holliday]

OK Cub .049A was my first succesful control line engine.  It powered many of the Scientific kits of the day.  Wore out one called "Sport Racer".  When I got ready for a second one they were discontinued.  I still have the little engine in my stash somewhere.  It was a much easier starting engine than the Thimble Drome Space Bug I had.  I also flew with 6-4 props and Cox fuel.  Same engine on an "American Boy" got me thru first loops.  Never knew how much I didn't know until I joined the "Flying Eagles of Kansas City Kansas".  Still having fun,  DOC Holliday