Sorry, I mis-spoke. I thought we were talking about the 15 and 20cc engines. These two engines have our-design carburetor on them and as thus are driven by muffler pressure (hence the need to mount the tank close to the firewall). However, you are correct that the 33 has a Walbro carb and has more freedom with tank placement as it has an internal pump.
ORIGINAL: spaceworm
ORIGINAL: jspauld2
We suggest mounting it as close as possible to the firewall. The fuel tank location is critical for fuel delivery.
I would suggest trying your tank location on the ground and check the running thoroughly before flight testing. ie: holding the model vertically and watching for sagging from the engine.
Does this mean that the Saito gas carbs are not equal to Walbro carbs in having an internal pump so that the tank location is not critical? The 33 seems to have a Walbro type carb, not so?