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Q1 Plans Chapter 17 Page 17-11


Begin by making CH3 and CR4. The holes drilled in CH4 is to allow a flange to be bent up to attach CH4 to CH3. Some bending and filing will be necessary to obtain a reasonable fit between CH4 and CH3. The QS100-m24W clamps are used to join the two pieces; RTV is used to seal up the remaining gaps.

The saw cut in CH3 must point forward.

The Aeroduct CAT-5 hose is joined to the CH4 and CH2 with Clamps.

Quickie Carb Heat Box Photo

Quickie CH3 Carb Heat Muff Detail

Quickie CH4 Carb Heat Outlet Tube Detail

Quickie Exhaust Muff Installation Detail

Q1 Plans Chapter 17 Page 17-12


In order to provide adequate clearance for the Carb Heat Box on top of the engine, you will have to fabricate a simple bump, or scoop, and pop rivet it to the top of the cowling.

Begin by rounding up the scraps of blue foam that you have remaining. With the cowling and carb heat box in place, place the foam on top of the cowling and carve it to a pleasing shape that will cover the carb heat box and fit flush with the top of the cowling.

When you are satisfied with the shape, remove the foam block from the aircraft and set it on a piece of clear plastic wrap. Next, lay up 3 BID over the foam, allowing the fiberglass to drape onto the clear plastic wrap to form a flange at least 0.6" wide. Permit the layup to cure overnight.

Now comes the neat part. Pour gasoline on the blue foam to dissolve it, leaving only the fiberglass layup. Now you can clean up the scoop, and rivet it to the cowling.

Quickie Carb Scoop and Flange

Quickie Carb Scoop Closeup


The oil breather tube is vented overboard at the bottom of the cowling. The original Onan breather tube and housing are extended with neoprene tubing.

Quickie Oil Breather Tube Photo

Quickie Oil Breather Tube Drawing