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Questions about rear mounted carburetors.

On the engines that use the rear mounted carbs like the ZDZ and DA's:

1) I have seen pictures of rear carb engines mounted on flat ( no engine box) firewalls where the carburetor appears to be directly open to the interior of the fuselage. Is this correct, or is there some type of internal carb box closing off direct access to the fuselage?

2) if the carb is open to the fuselage, how would you control any fuel blowing out of the carb ( such as an over prime?) A fuel proofed balsa carb box with an open top and a drain line in the floor venting overboard, maybe?

Thanks,

Mark D

Reply to
Mark D. Fain
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That's how it's commonly done...

That could be done also...

In practice, little fuel gets out of the carb. Certainly not enough to need a drain tube...It's enough to fuel proof the inside of the firewall/engine box. It's not a bad idea to fit a trumpet also. When in storage, leave off any hatches etc from the fuselage to allow the petrol fumes to escape. This'll minimise the impact of the petrol fumes on the plastic parts in the fuselage... a well known UK servo lead manufacturer has talked to me about petrol fumes eventually degrading the plastic servo connectors that he sells. Although this is a very long term thing, it's worth taking precautions...

-- Philip Rawson

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Reply to
Philip Rawson

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