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Joined Jan 2008
1,004 Posts
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Many years ago, I thought the problem with a 10 x 6 Rev-Up wide was slow acceleration out of the corners. I tried a Zinger 11 x 5 wide. I was flying off a stooge. When I pulled the stooge line, I found myself flying about ten feet behind the airplane, it was accelerating so much faster than it had been with the 10 x 6. A lot of people recommend the APC 10.5 x 4.5, but I have not tried one.
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United States, GA, Roswell
Joined Mar 2008
708 Posts
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Clunk or steel?
Clunk works fine but you still have to center the tank on the needle. The way I set up my tank is that I used two clunks soldered together or a single clunk with a tube soldered to it. Use one line to the clunk for fuel and the other to the second clunk or tube as a uniflow. Make sure the uniflow is at least 3/8 short of the fuel feed. You do not want bubbles to go in the fuel feed line. You will have to play with it till it shifts correctly from one side to the other.
The question is how much space do you have in relation to the center of the needle valve? Clunk tanks are fat while the regular metal CL tanks are thin. The question is can you fit a clunk tank and still have it centered on the needle or not? If yes you can go either way but if not you have no choice but to go Steel tank. |
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United States, GA, Roswell
Joined Mar 2008
708 Posts
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Lead outs
Start in the position indicated on the plans. Then if the loops or squares are getting looser every consecutive maneuver (I am assuming proper motor run an line tension in horizontal flight) then push them forward about 1/8 at a time. There will be a certain sweet spot where no matter what you do the model is positive under control. If you get it right you can do 5 square eights no break in between and go straight in hour glass with no problem.
I hope I make sense and this is clear. |
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I have installed a 4 oz clunk tank and is pretty much in line with the needle valve.am planning to change it to a proper cl tank when available.
70 foot lines is what I what i purchased and is easily adjustable down to at least 60 foot. I have the old style aeroflyte handle which you just wind up to the desired length. after that will transfer it to my trusty brodak handle. Thanks for the tips on the lead outs. I will ensure proper position before flight. I managed to start break in procedure and have found them (fox 35) to vibrate more than what I am used to (OS 25FP) , louder than usual , even with the supplied muffler and very smoky when running high castor content ! gotta love them ! Nobler is almost ready to fly. Alf |
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United States, GA, Roswell
Joined Mar 2008
708 Posts
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Pretty much does not make the cut in CL as the position of the tank is crucial for a good motor run.
A good safe start position for the tank is center of tank higher than center line of needle valve. I would say anywhere between 1/16 to1/8in higher is a good start and from there you can lower the tank till the motor runs even both ways (I am assuming that the motor would run a little faster inverted due to the slightly high position of the tank). That way when you go inverted it will be a little faster which is safe since you do not want the motor to lower the RPM inverted. If that happens and the RPM drops dramatically you are better off landing inverted. If your Clunk tank has center line below the center line of the needle I say be cautious when you go inverted. You don’t have to go with the Proper CL tank there is no such thing as a proper CL tank. Clunk and metal tanks both work well if you set them well that is all. The clunk tanks tend to be fat and their center lines fall very often below the CL of the needle that is why more often you will see the “proper” tanks in the CL planes. Yes FOX is vibrating like mad and you need a very solid nose construction. If that is vibrating too much go to a Brodack 40. It is lighter it is an even swap take bolts out put new motor put bots back in and you are done. Also if it is nose heavy I recommend the swap. Other choices out there are La40. Staler 40 the Double Star 40. By the way I love the colors you picked and the layout it is very beautiful. Put some cowl pictures and make sure you have good cooling that means for every square inch of intake area you have 2 inches of exhaust cooling area. |
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well done!!
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have finally maidened the Nobler today. All went well and only managed to do some loops and wingovers for the first fly. Used 65 foot lines and had plenty of tension on the line. I am using Brodak .018 flying lines and am thinking of using .015 as there was some arc in the lines.
Fox 35 ran like a dream throughout the whole flight and had plenty of power to haul it around even though mine came in a tad over 45oz. They sound great!! Glad i spent time to run it in. may even reduce some tip weight as well. Landing was super smooth and only had a little fuel left in the tank. 4oz tank was used. Thanks to all who offered advise and suggestions. Alfred |
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