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35% Extra 260 Engine Offset

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35% Extra 260 Engine Offset

Old 02-25-2009, 01:50 PM
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Default 35% Extra 260 Engine Offset


I have been told that there is an error in the 35% Extra 260 manual regarding the installation for a DA-100. The manual shows making horizontal and vertical lines on the firewall to find the center. Then the manual shows making a second vertical line offset 3/8" to the left (as if you are sitting in the cockpit). You then center the DA on the offset line.

I have been told not to use the offset line; that I should center the engine on the first vertical line. Should I center on the offset line? (I assume that centering on the offset line will make up for the right thrust and center the spinner on the front of the cowl.)

Thank You!

Also, will the average pilot notice an increase in performance by weight savings of going to a carbon fiber wing tube and not installing the pilot (I am thinking of hover pullout acceleration)?
Old 02-26-2009, 02:24 PM
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Default RE: 35% Extra 260 Engine Offset

I dont remember the exact issue w/ the firewall. it may have been confusion with the location of the centerline on the firewall. Short answer is that yes, the engine has to be offset 3/8" to the left side of the firewall to compensate for the right thrust. To be sure it correct, ignore any line on the firewall and measure a left to right centerline, then mark 3/8" to the left and center the engine there.

Regarding weight, IMO I dont think many pilots even way above average will notice a performance difference from the few ounces reduced by eliminating the pilot and using a CF tube. The pilot only weighs about 3.5 oz and a CF tube only saves a couple ounces. Unless you are flying at very high altitude and need it to be as absolutely lightweight as possible, I wouldnt worry about it. In areas such as here where were about 600 ft, the pull from a hover with a DA-100 for power is HUGE.

Hope this helps.

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