Compair 7
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Anyone here have any experience with the Compair Products? I'm looking at a Compair 7 with the Walter turbine on it. And I'm liking what I see. Just wanted to see if anyone has flown or see one and what your opinions are.
Thanks!
David
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A1Skinner offline


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Wed Jun 07, 2017 11:31 pm
I don't wish to trash talk, but look very carefully before you consider purchasing. Look at the control systems on the design. Ask yourself why you don't see many of them flying? Research the maintence cost associated with the Walter engine

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RockHopper offline
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RockHopper wrote:I don't wish to trash talk, but look very carefully before you consider purchasing. Look at the control systems on the design. Ask yourself why you don't see many of them flying? Research the maintence cost associated with the Walter engine

And look carefully at the major structures as well.
MTV
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mtv offline


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Thu Jun 08, 2017 12:27 pm
Do some looking in the NTSB database and I think you'll find enough info to give you pause.
This is a Compair 8, but just one example of catastrophic structural failure:
SUMMARY AIRCRAFT ACCIDENT RESULTING IN THE DEATH OF EIGHT SKYDIVERS AT JÄMIJÄRVI ON 20 APRIL 2014 On Easter Sunday, 20 April 2014 at 15:40 Finnish time (UTC + 3h) an accident occurred at Jä- mijärvi aerodrome when a Comp Air 8 aircraft, registration OH-XDZ, carrying skydivers crashed into the woods. In addition to the pilot there were ten skydivers on board. The pilot and two skydivers managed to bail out of the aircraft. Eight skydivers died in the collision with the ground. The OH-XDZ was the first turboprop aircraft in the experimental category in Finland. It was built in Finland from an aircraft kit. The Tampere Skydiving Club’s (TamLK) skydiving event “Easter Boogie” was in progress at Jä- mijärvi aerodrome. Finland’s Sport Aviators’ Comp Air 8 aircraft was reserved for the event; with it skydivers were being carried to the altitude of 4 000 m. The eighth Comp Air flight of the day reached the jump run, which was at 4 230 m over the southern runway of the aerodrome. The skydivers noticed that they had overshot the jump run and requested a new one from the pilot. The pilot increased engine power and simultaneously began turning to the left. During the turn the aircraft began to descend and its airspeed increased, which the pilot did not immediately realise. The pilot pulled on the control stick and the aircraft levelled out or went into a shallow climb. He reduced engine power to idle, in conjunction with which the airflow over the horizontal stabiliser probably decreased suddenly, which generated a rapid nose-down movement. As the angle of attack was decreasing a downward force was generated on the wing. The right wing’s wing strut buckled upwards and the right wing folded down against the jump door around the wing root mountings. The aircraft lost its controllability instantaneously and began to rotate around its vertical axis in a flight condition resembling an inverted spin. In the aircraft a decision to make an emergency jump was made. The wing which had folded against the jump door prevented exiting through the door. The pilot and two skydivers sitting at the front of the airplane bailed out through the pilot’s door. The others did not have enough time to bail out. They died in the collision with the ground. The aircraft was completely destroyed in the collision and the fire.
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Oregon180 offline


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I used to cringe seeing the development of that brand. They design iterations showed a lot of "that looks about right".
Back when I did aerospace tooling for composite construction I had a friend who worked for an experimental kit company. All I'm going to say is that the plane used to have a cruciform tail and then it didn't.
He left the company when he saw what their version of composite design was. Zero, and I mean ZERO stress analysis performed.
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aftCG offline

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Thanks for the replies and PMs. I am no longer interested in them.
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A1Skinner offline


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