March 16th 15, 07:54 PM
On Wednesday, December 3, 1997 at 1:00:00 AM UTC-7, Dennis Gillman wrote:
> I purchased Walt Lanes Turner T40 which appeared on the cover of SPORT
> AVIATION January 1974 and HOMEBUILT AIRCRAFT June 1978. It had been stored
> for about 15 years. It was restored and I have been flying it sense
> November of last year logging 120 hours of trouble free FUN and FAST (200
> mph at 2800 since). I discovered by accident on the computer, not
> catastrophic while flying that the prop that it had on it, notice I said it
> had on it, was cut down from a 74 inch diameter to 68 inches and repitched
> to 68 degrees. this was a very popular prop in the 70s for home builders
> particularly the T18 guys. the problem is this, the prop has a natural
> frequency that is exaggerated by the rpm and frequency of the engine
> (O290G). I was explained to me it is kind of like that bridge up north
> that practically shook its self apart from the frequency that was set up by
> the wind blowing across the wires, pretty scary if you saw the film clip.
> just felt like passing that along to the general population of pilots that
> may be flying these modified props. by the way, Sensenich say there isn't
> any WARNING when it goes, no indication of cracking or anything. If your
> flying one of these props you may want to give Sensenich a call.
> Good Flying Dennis Gillman
Dennis Gillman - do you still own the Turner T-40 that Walter Lane built?????
> I purchased Walt Lanes Turner T40 which appeared on the cover of SPORT
> AVIATION January 1974 and HOMEBUILT AIRCRAFT June 1978. It had been stored
> for about 15 years. It was restored and I have been flying it sense
> November of last year logging 120 hours of trouble free FUN and FAST (200
> mph at 2800 since). I discovered by accident on the computer, not
> catastrophic while flying that the prop that it had on it, notice I said it
> had on it, was cut down from a 74 inch diameter to 68 inches and repitched
> to 68 degrees. this was a very popular prop in the 70s for home builders
> particularly the T18 guys. the problem is this, the prop has a natural
> frequency that is exaggerated by the rpm and frequency of the engine
> (O290G). I was explained to me it is kind of like that bridge up north
> that practically shook its self apart from the frequency that was set up by
> the wind blowing across the wires, pretty scary if you saw the film clip.
> just felt like passing that along to the general population of pilots that
> may be flying these modified props. by the way, Sensenich say there isn't
> any WARNING when it goes, no indication of cracking or anything. If your
> flying one of these props you may want to give Sensenich a call.
> Good Flying Dennis Gillman
Dennis Gillman - do you still own the Turner T-40 that Walter Lane built?????