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View Full Version : 818S rear diffuser position



RM1SepEx
06-30-2016, 01:04 PM
So I've mounted up the rocker boards and front street splitter, I have the CF rear tail spoiler and need to finalize the location of the rear diffuser.

Based on FFR's aero development work what is the preferred location for the diffuser, it could be mounted with as little as 1 inch beyond the rear clip to as much as 4 inches beyond. I rezalize that it may never actually come into play but I do have a flyin mile event at Loring in Northern Maine and I'm told I could run my 818S in the up to 150 MPH class

wallace18
06-30-2016, 02:29 PM
Dan, IMO it is really up to the builder. Not sure any wind tunnel work on different lengths has been done to my knowledge.

RM1SepEx
06-30-2016, 03:13 PM
Any photos on what you have done Tom? The aluminum panel provided doesn't really match the open space or the steel tubing no matter where you place it...

wallace18
06-30-2016, 06:57 PM
Check these 2 build threads of mine. I did each one slightly different.

http://thefactoryfiveforum.com/showthread.php?9031-Wallace18-quot-s-818-Build/page10 check post 391
http://thefactoryfiveforum.com/showthread.php?15296-K818S-Build-Thread/page5 check post 190