Quote:
Originally Posted by jimepting
It is interesting that 3-wheeler has not revealed any fuel economy data taken directly for FE measurements. I met Jim last summer and talked to him at some length. Very pleasant, helpful and thoughtful gentleman. I did not bring up the measurement subject, but we had discussed it earlier on this forum. He had been a fan of roll-down testing instead, but he has found some technical GPS problems with that mode of testing.
I'm waiting anxiously for him to post some tuft testing on his beautiful boat tail. I'm not sure he considers the project finished though.
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Hi Jim,
Actually, my fuel records are posted here at EM. Just look in the garage.
And you are recalling correctly about the GPS giving too erratic of readings to really be useful.
Because of this, I gave up on coast-downs for a while.
Since then, I found an old camera around the house and am recording the speedometer readings during coast-downs in video mode. I play back the video frame-by-frame to get the exact speed decrease and put the numbers into a spreadsheet.
If this turns out useful, I will post something.
Regarding the tail, I still think the upper-back portion is too steeply sloping. Tuft testing would hopefully prove my hunch.
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Interesting topic and discussion!
Jim.