Replies to This Discussion

Permalink Reply by Kevin McCune on November 28, 2009 at 8:03pm

This is a very good drawing to think about. My design has only one tube ( standard position in tank) to draw fuel from and a collector tank. So if I fly steep descents, the engine will not starve for fuel. But the flow from the tank will be interrupted. I have ram air gas caps so (hopefully) the flow starts right back up! But if it does not the dual lines would have been better. But the drawing also makes me think that the fuel is being sucked out and so as the fuel gets below the Tee fitting no gas will flow. So maybe the best design would be a collector tank, two fuel feeds with no tees, but all directly into the collector tank???
Don't hold back, let me know your thoughts, I'm trying to figure this out as well, I thought I had, but I was wrong!... Don't tell my kids, they were raised to think I am always right....well for the first 5 years or so they fell for it! Now they don't think I know anything!

Kevin

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Permalink Reply by Paul Schelfhout on November 28, 2009 at 11:16pm

Kevin there have been a number of good points - the method I chose is exactly as per your drawings. I am not yet flying but it shouldn't be too long now - a couple of months or so.

Regards Paul

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Permalink Reply by Chumphol Sirinavin on November 29, 2009 at 2:30am

Kevin,

Around six-seven, kids will start learning by themselves, and you are not their Big Dog anymore.

CH 701, with +6G -3G design, is good for aerobatic, But being an amateur builder and leisure flier, with all my OOPs here and there along the build, and at times wondering about the thickness/thinness of material in use, I restrict it to mild aerobatic only, and not to worry much about flob tube or air lock in fuel line too much.

Keep it light!

Champ

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Permalink Reply by Shay King on November 17, 2009 at 1:47pm

Paul,
I built my 701 between 2000 and 2003 with most of the kit coming from the Czech Aircraft Works. The fuel tanks came with 2 outlets each, one at the front inboard and one at the rear inboard, the fuel lines are tee'd together in the wing root before entering the fuselage. I've had no problems in 6 years, but I don't let the fuel quantity get very low.

I hope to build a 750 sometime, I would have concerns about the single outlet fuel tanks and would probably customise the tanks unless Zenair could convince me it was unnecessary.

Good luck.

Shay King CH701/Rotax 912 uls Ireland.

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