Q1 Plans Chapter 17 Page 17-6
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- Category: Quickie Plans
- Published: Monday, 12 May 2008 10:28
- Written by Dan Yager
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INSTALLING THE ENGINE BAFFLING
Insuring that your Quickie engine cools properly is a very important part of the construction of your Quickie. Please read this section carefully, make sure that you understand the principles involved, and take your time performing the actual work.
The Quickie uses an air-cooled engine. The cooling air enters the front of the cowling through the large inlet h1e. The engine baffling insures that the air flows accross the cylinders, down the backside of the cylinders, and then exits out the ar outlets (one on each side of the fuselage at the firewall). Maximum efficiency and performance can be cbtained only if the baffling is air-tight so that the air will not escape to other locations within the cowling. Any air that escapes can obviously not be used for cooling. This will raise engine teinperatures, or require more initial cooling air; either result is undesirable.
Approximate patterns for the engine baffles (EB1 thru EB4) are included here and on Appendix Sheet 7. These patterns are approximate, and do not include holes for exhaust pipes, engine controls, etc
Rather than try to make the metal baffles fit perfectly together and conform exactly to the inside shape of the cowling, asbestos strip riveted to the baffles are used to seal off the last 1/2 to 1” between the baffles and the inside of the cowling. Asbestos and RTV are used to seal up joints and holes in between the baffles. The work will involve much trial and error and will require the installation and removal of the cowling many times. Go slow and do the job right the first time.
Short, bent up angles out of 0.032” aluminuu are used to mount the baffles to the engine and each other. Since the engine does vibrate, properly securir the baffles is important. Remember that the baffles must be removable for maintenance on the engine. Therefore, nutplates should be used where necessary to allow the baffles to be disassembled. The bolts on the engine that may be used to secure the baffling have been painted red for easy identification. The exception to this are the two bolts on the engine block, directly above the :Eront bearing casting, which are painted reds and are used to mount the ignition coil.
