RCU Forums - View Single Post - Tank position problem.

08-30-2009 | 01:07 AM

#30

DarZeelon

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From: Rosh-HaAyin, ISRAEL

RE: Tank position problem.

Quote:

ORIGINAL: Motorboy

But most generally: Follow the building construction/plan of aircraft where the engine and tank will be placed in right place.
Some time the tank are in the kit of model airplane, and follow instruction where the tank are placed.

Jens,

This is the exact problem!
Most kits and nearly all ARFs, that have the engine mounted upright (or inverted), DO NOT place the fuel-tank at the proper level.

This is a fact.

If the engine is upright, the fuel-tank will most likely be lower than ideal!

If such a model is built according to plans, or in an ARF, according to the instructions; when the plane is flown inverted, the engine will be running significanly richer than it ran when the plane was right-side-up... This is because the instructions/plans tell the builder/assembler to mount the engine too high!

With the holes already drilled in the firewall, there is not much of a choice.

And as to the large hole in the firewall, for the fuel-tubing (in which most normal tanks' 'snout' fits); it is always located behind the crankshaft center-line; not behind the carburettor...
This means it is about 40 mm (1.5" ) too low...

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