When installing uniflow tube in new Gieskie Bear I cut it too short. I also put a tank in this plane that the Moki was fed with in an old Grinder It would not run the same. I tried several things and nothing seemed to work so I thought something was wrong with the tank. I finnaly got down to no more options when the light bulb went on. Maybe the uniflow tube is too short! I added about a inch to the tube an walla it worked like it should. The motor now runs like it should and now am happy camper. The morel to the story and be like me and never give up.

Yah, spelling is a bit offf, but jest of solving problem was informative if I understand it correctly. You put a known good engine with a known good tank in a new plane.
The external uniflow tube that should be in a good position to get the proper anount of air intake was not in the proper position because it was too short. You then added lenght to the tube to get it in the right place to pick up proper air intake and the engine ran as good as before, in the original plane, engine, tank combination.
Sounds like you fixed your problem just ducky, congatulations.
Be happy, fly well, have fun, enjoy. Thanks for sharing the problem solution.
Will file this my in troubleshooting memory bank, get er in the right place.
Tell me what I say.
Jerry

OK Leo, who guessed right?
1-Experienced Helpfull Gentelman who guessed tube inside tank.
2-Old Fart who guessed tube outside the tank.

I am afraid to type who answered problem the best because of my typing. I sometime think I have 10 Thumbs. The tank was used in plane before so am sure that uniflow was in proper place. I think that tube was too short and not far enough forward. The solution worked so It must have been the problem. Dum Post Maybe.

Don't be afraid to type my good buddy in balsa! LOL!!  Just learn to click on the tab that says "Spell Check" below the message window!   it took me a while to get used to that.  And I still forget sometimes!

And as to "all thumbs", my ring size is about a 20.......... so I DO have all thumbs! 

Outside tube. uniflow won't work if inside tube is not in right place either.

Thanks But I thought you were not supposed to watch the keyboard when you typed. In any case I finnally spell checked the post thanks to you!

Well that's what they told us in school...insured that we did so by using all blank keys--what frustration.

I noticed you cleaned up the original. Very nice.   I hope, Leo, you understand I was just ribbing you a little...apparently I need to flag my jokes (re: another thread).  Don't hesitate on my account to type any way you want. 

Your typing may not be the best, but you sure build prettier airplanes than I do!

--Ray

Here is picture of tank uniflow and overflow setup. May be interesting to a few people that would like to do a clean setup. This time I am using spell check! Spell check flagged uniflow. Go figure. Another thing I do is build the crutch first and mount the engine. I then set tank on crutch platform and run a 3/32 rod into the pickup tube and make sure it lines up with the needle valve body. It is important that it is right on. this will also tell you if pickup tube is level.

Hey you guys are my friends. You can insult me if you wish. I'm a happy flyer. Just like my wife said about my drinking before we were maried 29 years ago. You are a happy drunk. I was then doomed to a life of happiness.