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2ndAmendment

Just a forgiven sinner
PREMO Member
Interesting engine support system. I wonder how much rotational stress that puts on the wing spars and whether thrust changes cause wing angle incidence changes.
 

Ponytail

New Member
2ndAmendment said:
Interesting engine support system. I wonder how much rotational stress that puts on the wing spars and whether thrust changes cause wing angle incidence changes.


That close to the wing root/fuselage, It'd be easy to support it, especially with composites, so that the rotational stress on the wing would be nill. I wouldn't be surprised if the wing spar started at the outboard side of the engine, and everything inboard of the engines was an oversized torque box.

I'd like to see the skeleton either way. Looks like it could be interesting.
 

Bustem' Down

Give Peas a Chance
I wonder what advantage the plane has in putting the engines like that or if it was done just to look cool.
 

dustin

UAIOE
Bustem' Down said:
I wonder what advantage the plane has in putting the engines like that or if it was done just to look cool.
Possbily engine noise reduction in the cabin :shrug:
 

Ponytail

New Member
dustin said:
Possbily engine noise reduction in the cabin :shrug:

Cabin Noise reduction as well as making more room in the cabin for storage, APU, facilities...whatever.

It takes less (lighter) structure to support a weight from the bottom of the weight, that it does to cantilever it. Less fatigue

Also, with that short of a fuselage, having the engines in the back, creates a helluva moment. It would need more weight or downforce up front to balance the plane in flight. Having them on the wing puts them closer to the natural center of gravity.
 
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2ndAmendment

Just a forgiven sinner
PREMO Member
I guess the engine geometry would also force the nose down if the CG got aft of center which could be an advantage.

I brought up the wing spar thing, because I had a plane that suffered from a fatigue crack due to the design of a landing gear attachment bracket of all things. It was designed so that the hydraulic actuator for the mains caused a rotational moment on the spar. Nor only that, it was multiplicative. The gear had a 500 psi actuator that was applied all the time while gear was up. That was a safe arrangement, because to drop the gear in a no hydraulic power situation, all you had to was release the pressure on the system and the gear would drop. The actuator pressure on the bracket cause about a 4 to 1 rotational moment. That would micro flex the spar at the attachment point because of the 2000+ lb torsion. A year and a half grounded and $6000 later after the manufacturer came up with a much larger bracket to divide the load so the the 500 became about 100 and I was good to fly again.
 

Ponytail

New Member
2ndAmendment said:
I guess the engine geometry would also force the nose down if the CG got aft of center which could be an advantage.

I brought up the wing spar thing, because I had a plane that suffered from a fatigue crack due to the design of a landing gear attachment bracket of all things. It was designed so that the hydraulic actuator for the mains caused a rotational moment on the spar. Nor only that, it was multiplicative. The gear had a 500 psi actuator that was applied all the time while gear was up. That was a safe arrangement, because to drop the gear in a no hydraulic power situation, all you had to was release the pressure on the system and the gear would drop. The actuator pressure on the bracket cause about a 4 to 1 rotational moment. That would micro flex the spar at the attachment point because of the 2000+ lb torsion. A year and a half grounded and $6000 later after the manufacturer came up with a much larger bracket to divide the load so the the 500 became about 100 and I was good to fly again.

Ouch. What plane was this? I'm still a youngin' with this stuff. I'm curious.
 

2ndAmendment

Just a forgiven sinner
PREMO Member
Ponytail said:
Ouch. What plane was this? I'm still a youngin' with this stuff. I'm curious.
Rockwell Commander 112 and 114. I had a 114.
<img src="http://www.acf.clara.net/scale/scale-pics-1/low-wing/rockwell-114/com-11.jpg" />
Mine was a 1976 and red, burgundy on white. Sweet flier; normal cruise 145 knots; service ceiling 16,500 ft. It had been a corporate plane so it had some upgrades and things others of the same model year did not have: double pane Plexiglass side windows, door locks for the 1977 model, custom interior, more insulation for sound and temperature. It was really neat. Wish I could have kept it.
 

ACESRT04

THE OTHER
Well Honda isn't the only company getting into this small affordable jet segment. Eclispe (spelling) in New Mexico has been working on a jet about that size for about 4 years now. Also I quickly caught a glimpse on T.V. of Burt Rutan's company doing a small affordable jet.
 

Lamini

Member
those are the same exact bikes the mailman drives in japan... punks always managed to drive by me regardless how much (or how little) room i made between them and the gutter.
 

BS Gal

Voted Nicest in 08
2ndAmendment said:
Interesting engine support system. I wonder how much rotational stress that puts on the wing spars and whether thrust changes cause wing angle incidence changes.
I was just going to say that......or not.
 
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