OK Cub .049 A
 

I have a new Cub .049 and can get 75 hundred rpm with it with a cox 6 3 prop. Is this just about right?

RE: OK Cub .049 A
 

sounds like you need to try a 5x3 prop.

RE: OK Cub .049 A
 

Correction. I think the prop is a 5 3 cox. Fuel is 15% cool power.

RE: OK Cub .049 A
 

Storm:

The OK Cub was, and is, an excellent engine. But the Coxes and Norvels will blow it away.

If you want to build a "Nostalgia" plane have at it. but if you want your plane to fly with "Authority" put the Cub back in the box and use a more modern engine.

Sorry, but that's just the way it is. I have one in the box also.

Bill.

PS: 7500 on a 5x3 is still a bit low. Try a lower % nitro. Five percent was a hot fuel in 1950. wr.

RE: OK Cub .049 A
 

Thinking about a 30 in Dakota with 2 channels. I think a cox or norvel would be too much.

RE: OK Cub .049 A
 

It was recently posted here that a proper replacement for "original Cox" brand fuel is very high %age glow (25-30%) wwith a high (20+%) oil content. Search for "Cox."

RE: OK Cub .049 A
 

That'll be a fine combo. Sounds like your engine is still pretty tight or needs some compression ratio fine tuning. Most of the guys I see flying classic nostalgia free flight with the Cubs are getting into the low 'teens for rpm. You should be able to break 11,000 on a 6x3. But a Dakota wouldn't know what to do with the extra revs anyway.

Hotter fuel may help. 15% is pretty mild for Cubs. 25% is better.

And YES, either a hot Cox or a Norvel would be gross overkill for a Dakota. A Cox single port cylinder engine like a Baby Bee is fine however. Seen 3 or 4 FF Dakotas with Baby Bees and they aren't grossly overpowered. Just skittish.

RE: OK Cub .049 A
 

Original Veco Dakota (24 in.) was designed for the then new O.K. Cub .049. I've flown them on everything from Spitzy's to Baby Bee's. Baby Bee worked real well if you decrease the left thrust shown on the plan. I believe a 30 inch Dakota could easily handle the Cox. BTW, BMJR is now kitting the Dakota F/F with laser parts- Jim

RE: OK Cub .049 A
 

Overwhelmed by nostalgia I ran a couple of my old Cubs yesterday. They will still slice a careless thumb just like in the 50s!

RE: OK Cub .049 A
 

as with all the old motors 1/2A's included they really shouldn't be run on the modern fuels. Even today's new 1/2A's still recommend 25% oil and these are high performance jobs. The old Cub will be an old over the hill motor in short order if you continue to use 17% cool power. Use Omega if you must it at least has some castor but really not enough to extend the motors useful life.
Used a lot of Cubs in my youth while not the most potent they were always a snap to start as long as your battery was fresh. Same for the Wen mac's they really needed a hot plug or else you heard the old cry'When's it going to start....MAC.
Dennis

RE: OK Cub .049 A
 

.. So which is better- bumping an antique thread up or starting a fresh one?

In any case, in my quest for the cheapest engine possible I looked at the cub web site and found they are planning to have twins!

[link=http://okengines.com/news.shtml]ok cub mfg.[/link]

How cool will that look in a J3's cowl?

hope it's cheap.

RE: OK Cub .049 A
 

I just checked out the OK web site, and read their .049B was "the longest selling model airplane engine ever" That's great, ya gotta love it! I sure hope OK goes through with making those twins available, too cool! -I'd buy one just because...

Nick

RE: OK Cub .049 A
 

I had no idea the OK Cub was still being made. Just asked if I could have one please. Sounds just right for my sport "floaters". Hope they got one left for me. Thanks McLintock for the link.

RE: OK Cub .049 A
 

I believe if you check in the Model Aviation plans list you will find a Dakota converted to RC. They increased size, removed all wing incidence, used built-up wing.
Don't remember other details. Might be a place to start.

George

RE: OK Cub .049 A
 

If they made those modificatione, it ain't a Dakota. Call it a Dakotaish or something.