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😕 I don’t know what happened to this post but here goes again—I have ordered a Dakota Kit and I have a question regarding the OK Cub.049 as to it’s merits and possible shortfalls. I have an Norvel Big Mig .049 with a Galbreath head and Nelson Plug—for which I can get a Texas Timer radial backplate. But I have kinda wanted that in a mouse racer so I don’t know if I can get a PC .049 to fly the Daktota event—or am I reading the rules incorrectly? So I have a few question in this post—but I will go for any recommendations you might have. 8)
Use the Norvel on the Mouse Racer. If you put it on the Dakota, it will rip the wings off!!!! 🙁 🙁
A Cub or better yet, a Cox Pee Wee .020 would be much better than the Norvel. With the Pee Wee, you will have to mount it well forward of the standard mount due to CG concerns.
A Cub or Wen-Mac would be just right. It is designed for low powered 1/2A engines. 🙂 🙂
Good day forum readers, I’ve just built a Geef for early nostalgia and have mounted a 049 cub on it. As everyone knows the Cubs don’t produce a lot of pwr. Is there someone out there in FF land that reworks these little engines for better performance? Info. would be greatfull!
Thanks,
Scott
Portland, TN
A friend of mine and I had an experimental Cub that would turn an APC 5.5 X 2.5 at around 22,000 on 65% fuel! It lasted through 6 test flights and 7 contest flights before the crank snapped. 🙄 🙄
The 7 contest flights, witnessed by Luddite Dan Hisself, were zero thermal maxes on an overcast day. 😀 😀
The only major change was to use an adaptor to mount a Nelson HD plug. These plugs, with a vertical coil like the conventional plug, seal at the bottom rather than at the top. Less combustion chamber volume. 😉 😉
Now the search begins for a new crank. Not so easy as the quality control at Herkimer Tool Co. was rather spotty. 😥 😥
😕 Another question —any references for the Newer Brodak Mark II .049. I am not a Brodak fan but except for going for a Paw .049Diesel, the CUB isn’t my idea of a good engine—kind of flimsy from those I have seen taken down. I agree about the Norvel Big Mig it’s a howler and too much for a Dakota. 🙄
There was an article in the Digest in 2002 about how to soup up an OK Cub. The major changes were to lighten and shorten the piston to allow sub piston induction, open the bypass ports particularly on the later cylinders that have the wider struts in the cylinder, Trim the crank disc on either side of the pin to increase the counterbalance,and open the intake port edges in the crank. Timing remained the same throughout. A recent note recommended sealing the cylinder head with red silicone sealant that gave unbelievable increases in power. If you find a place that sells Nelson adapters for the Cub let me know. Please note that the latest Cubs with the button heads is not legal for early 1/2 A. Thermals Glenn
Glen or others with access to 2002 Digests,
I would like a copy of that article. I will pay copying/postage/handling, etc.
Reply to my email: flydean@worldnet.att.net
Thanks
I fly 1/2A NOS with a Cox Medalion, and I am building an early NOS (fubar 36x) and will use a Wen-Mac MkII on it. I don’t “push” (only 35% nitro) my engines and I fly quite competitive with them. I have competed against Fox FAI .049’s them seem to be very good engines.
I have a Dakota with an OK Cub .049 and a Perfect 1/3 oz. tank epoxy’ed to the rear of the firewall. Won’t haul it up quite like a Babe Bee, but still a great sport airplane. The only issue I’ve ever had with OK engines is the blunt needle valve, but that’s a simple fix with a fine file. Another good engine would be a Cox Sure-Start. Jim
😀 The OK Cub and the Dakota kit have arrived over the past three days and it’s going to have to wait it’s turn but I hope the combo will work well. I don’t want to have to traipse all over chasing freeflights anymore it’s gets to be weary day for these old legs. However all that being said I am looking for a KIWI 1/2A because I have a strong engine ready for that—I used to have much fun with those VTO designs of the past. 8)
Flinger- You can get a laser cut Kiwi from BMJR. Jim
I have built a GEEF 250 like the one in the photo by scottl0413 (very nice looking plane Scott) I used a Medalion on mine. I am now building a scaled down version of the GEEF (513 SQ IN) which will be 250 SQ IN but have a little bit higher aspect ratio wing. As well as a slightly different
🙂 Hey Jim thanks for the nudge I only just got the BMJR catalogue. So I order the KIWI and probably will try the Norvel .049 Big Mig. That motor oughta put her up there in the wild blue. So soon as I finish my two Clown T/R racers and a Goodyear T/R. They should be read for painting next week and then I will start a dual build on the Dakota and KIWI. 8)
@flydean wrote:
A friend of mine and I had an experimental Cub that would turn an APC 5.5 X 2.5 at around 22,000 on 65% fuel! It lasted through 6 test flights and 7 contest flights before the crank snapped. 🙄 🙄
The 7 contest flights, witnessed by Luddite Dan Hisself, were zero thermal maxes on an overcast day. 😀 😀
The only major change was to use an adaptor to mount a Nelson HD plug. These plugs, with a vertical coil like the conventional plug, seal at the bottom rather than at the top. Less combustion chamber volume. 😉 😉
Now the search begins for a new crank. Not so easy as the quality control at Herkimer Tool Co. was rather spotty. 😥 😥
This sounds like our freind Ron Sharpton!
You guys probably don’t want to hear this. We have the Cub back together with a heat treated crank. It runs just like the other. On merely 40% it turns the same prop at 20,800. The 65% go-pop being saved for truly festive occasions.
We got another nearly finished with the tuning procedure. It shows equal promise. 😀
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