Inboard tank mount on ARF Flite Streak

Hey yall

Having very little room between the engine and wing, I have heard of some succesfuly mounting the tank INBOARD. Can anyone give me any details and important FYIs? Thanks!

Not Flight Streaks but yes inboard tanks do work rather well. These are Hays 3 ounce clunk tanks with the front shimmed out from the fuselage a tad. Consistent run with clean shut off. I cut 1/8 slots behind the engine and epoxied two tubes in to bring the feed and muffler pressure lines across the fuselage. Makes for a clean neat tubing installation.

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I have had trouble getting decent runs with inboard tanks. The engine goes much richer in flight, so much that I have to set the needle as lean as possibe for launch. I was running the fuel line under the fuselage, making it pretty long. Do you think this could be my problem?

O have had very good luck running the pressure line and the fuel feed line through the fuse from the inboard side.I have lost all pictures of my "Claude" using this system, but there is a picture of this plane on
JJ

Never Give up! Never Surrender!

Russell,
Where you run your tubing probably has little to do with your problem. When you take off, the "centifugal" force creates a positive pressure head, which richens the mixture.

Other than giving you more space for a tank, the other advantage of using the inside fuse for the tank is when the plane speeds up, the mixture will richen and slow the engine down. Some think this helps in wind-up. Of course in your case it is a trick to find the correct setting on the ground.

Russell,

Are you running muffler pressure? All 3 of my inboard tank setups are running muffler pressure and I do not have any problems with needle settings at all. I went to the inboard tank for the exact reason you are talking about except with a GRW chicken hopper the problem was the exact opposite. Had to set it so rich on the ground it would hardly take off.

Another item that may contribute to my luck with this set up is I am running all 3 engines at a rich two stroke. Brodak 25, FP 21 and Fox 35 (actually a 30 with Plasma P&L). All 3 run great and whatever I set the needle at is where they stay. Haven't tried it with a 4-2-4 engine setup and no pressure.

Was pretty skeptical myself but my friend Danny Dirt talked me into trying it.

No pressure. Maybe that's my problem? My Enya 19 Akromaster runs far better with a home made outboard metal tank than with my original inboard clunk. Don't have a muffler on it, though.

I would think without pressure the fuel head would have more of an effect on what the needle sees. I also don't see a big change from full to empty like one would normally expect with the conventionally plumbed clunk tanks I am running. Only thing I can attribute it to is muffler pressure keeping what the engine is seeing close to the same throughout the flight.

If the muffler pressure exceeds the centrifugal force pressure then centrifugal force will have less (but still some) richening effect.

Sean,
(Hi!)

I presume you'll be running a Fox 35 on the Streak?

In my experience, Fox 35s don't much like muffler pressure. It can be done, however, and as mentioned above, settles the issue nicely.

You should be able to find a 'lowest-2-cycle' setting that works the magic described. There are good tongue mufflers for the Fox 35 available - I like RSM's - that can be tapped for a pressure nipple.

As you know, I make tanks for individual models, so I can fit enough juice outboard in the short space the Streak allows us. Still, after all the talk I've heard, I'm using an OS 25LA-S on (tongue) muffler pressure on an ARF Streak. Good economy! a simpler tank is enough fuel load.

You WILL enjoy the Flite Streak, more so if it is your first...