I am assembling a
Hobbico Avistar 40 MKII AWARF (old one) with an OS 46FX engine. After installing the tank w/presure, fuel feed, and fill lines (3 lines from tank) and the OS 46FX engine I find that the tank is positioned well below the carb of the engine. I also find that there is very little room to run the tank lines to the engine as the engine back plate is seems very close to the tank outlet lines. I have built the plane following the instruction supplied with the plane.
I have researched this site for information where the tank should be positioned and found the following statement:
"You also need to check the height of your tank. If you have the throttle open and look inside the carb, you will see a brass tube sticking across the inside of the carb. This is the spray bar and should be even in height with the tube that runs from the tank to the needle valve on your engine (or reasonably close - within 1/4)."
As stated previously, the tank outlet lines come out of the firewall right in line with the engine backplate. The tank neck fits into the whole in the fire wall which supports the tank along with a preshaped tank support former at the back of the tank compartment. The engine was mounted utilizing the previously drilled holes and installed blind nuts in the firewall and utilizing a supplied GreatPlanes Adjustable Motor Mount which also is used to mount the front steering wire landing gear.
My questions:
What am I to do?
Will the plane fly as designed with the tank below the engine carb?
With the OS 46FX engine installed is it normal for the space between the fire wall and the engine back plate to be close? Engine was mounted toward the end of the engine mount.
What trouble will I be getting into if I attempt to fly the plane with the tank in it's present position?
Any and all suggestions and recommendations will be greatly appreciated.
Thanks,