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25 May 2022, 13:34 [ UTC - 5; DST ]


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 Post subject: Re: MU2 Pre-buy speed 36 ktas below book
PostPosted: 07 Jan 2022, 11:56 
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Why didn't you buy it?


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 Post subject: Re: MU2 Pre-buy speed 36 ktas below book
PostPosted: 07 Jan 2022, 13:18 
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Joined: 11/08/12
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A point, for this topic and in general

Fleet airplanes can sometimes have interesting provenance.

Tpe 331’s are real easy to swap around. Eg did this planes engines get sold last year and replaced with engines that canme off a freighter 12 years ago and has 14000tt?


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 Post subject: Re: MU2 Pre-buy speed 36 ktas below book
PostPosted: 07 Jan 2022, 13:32 
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They came from N484AF, which was on contract to the Air Force for target services, as far as I can tell. Total hours are 4,000 and 13,000 hours, total cycles 4000 and 17000, or were at last log entry. Air1st's ad said they're both 2200 hr SMOH and 275 hr since HSI which, barring bad management, should mean they're in good shape.
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 Post subject: Re: MU2 Pre-buy speed 36 ktas below book
PostPosted: 07 Jan 2022, 14:14 
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Aaaaaaaand now we are starting to get an answer


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 Post subject: Re: MU2 Pre-buy speed 36 ktas below book
PostPosted: 07 Jan 2022, 14:24 
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Username Protected wrote:
Looks like he’s at 875, which is around what most folks limit to. I was taught 900 and use that for my personal max.


Not sure who is teaching that. That leaves a huge amount of performance on the table


What's your target ITT?
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 Post subject: Re: MU2 Pre-buy speed 36 ktas below book
PostPosted: 07 Jan 2022, 15:10 
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Company: USAF Propulsion Laboratory
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Why didn't you buy it?

It was for a friend. He thought it was overpriced. I would have gone partners with him on another MU-2 with -10 motors. But he wanted to go solo and I really did not need to purchase a third airplane!


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 Post subject: Re: MU2 Pre-buy speed 36 ktas below book
PostPosted: 07 Jan 2022, 15:46 
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I don't think that 253knots is normal for ANY MU2 much less a K model. The -6 powered short bodies are 275-285 knots airplanes. I think you made a very wise call walking away from this one.


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 Post subject: Re: MU2 Pre-buy speed 36 ktas below book
PostPosted: 07 Jan 2022, 15:47 
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looking at the second panel picture posted, the engines are not producing the same power by both the torque gages and the fuel flows. I don't see a turn and bank, but from what I see there would have to be a slight yaw into the engine producing more power. Uncoordinated flight will cost airspeed. I wonder what your results would have been if you balanced the engine output and made sure you were truly coordinated. FWIW, my F model would perform similarly to the picture of N18BF shows at mid cruise weights. At FL250 my IAS was 180kts at -24C on 56gph which results in 265KTAS. At FL240 on the return trip at -34C, IAS was 192 on 64gph giving a TAS of 272kts. These numbers were from a trip to Tennessee and back in November for my 100/200hr inspection. Just two people on board but departed with 366 gallons of fuel on board. The F model MU-2 is a wonderful aircraft!


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 Post subject: Re: MU2 Pre-buy speed 36 ktas below book
PostPosted: 07 Jan 2022, 15:49 
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Username Protected wrote:
Total hours are 4,000 and 13,000 hours, total cycles 4000 and 17000, or were at last log entry

Does that explain substantial torque split at similar temps/fuel flows (61% / 54%)?


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 Post subject: Re: MU2 Pre-buy speed 36 ktas below book
PostPosted: 07 Jan 2022, 16:50 
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Am I missing something on the performance run? Torque settings don't reflect it was set to book power but was it set to a recommended cruise temp?


Anyone have -6 ITT recommended cruise temps they can post?


Flying 20º cooler than max recommended EGT (not redline) can produce a big 15 knot decrease in speed for me, despite only being 3-4 total gph lower fuel burn. Specific range stays almost exactly the same.

If the torque gauges are calibrated correctly, that 7% lower RH torque means it's down ~45 hp. Ball is centered, so the tail may be dragging in the wind.

Even if both engines were making only 54% torque, the chart shows it should be going faster. I have a hunch that there's a pitot static issue.


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 Post subject: Re: MU2 Pre-buy speed 36 ktas below book
PostPosted: 07 Jan 2022, 21:30 
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There definitely is something with previous posters mentioning torque, ITT, and fuel flow between the two noisemakers. It would be interesting to see the rudder and ailerons in flight to see if there is any drag created keeping the bird centered.

MU2 drivers - The ball is not quite centered. Would that explain about 4 KIAS of the 36?


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 Post subject: Re: MU2 Pre-buy speed 36 ktas below book
PostPosted: 07 Jan 2022, 22:33 
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The 17,000 cycle engine that the seller put on this plane is the cause until proven otherwise


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 Post subject: Re: MU2 Pre-buy speed 36 ktas below book
PostPosted: 07 Jan 2022, 22:54 
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Username Protected wrote:
The 17,000 cycle engine that the seller put on this plane is the cause until proven otherwise


Charles, a 17,000 hour or cycle 331 “case” really has nothing to do with power production. That would be equivalent to saying that a given Bonanza was slow because it had a high time case.

What is apparent to me, and I have zero interest in the subject aircraft model issues, is that the kind of mental energy spent in this thread is entirely saved by accomplishing a flight check as a part of a buyer’s evaluation with someone who knows what they are doing. Period. Same with any airplane.


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 Post subject: Re: MU2 Pre-buy speed 36 ktas below book
PostPosted: 07 Jan 2022, 23:14 
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Company: Premier Bone and Joint
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Aircraft: BE90,HUSK,MU-2
I fly mine at 20deg below EGT redline at 97% engine speed (as recommended by Honeywell’s engineers when I bought it) which usually burns 75-80gph and yields around 310-315kts. It usually cruises pitched up about 2.5 degrees according to the G600 and the other two independent AI’s. I bought mine from Mike Laver. He owned my 50AF before his current -ED. He’s a very honest guy. Based on his reputation, I bought mine without pre-buy and very little has gone wrong in 5.5 years.

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 Post subject: Re: MU2 Pre-buy speed 36 ktas below book
PostPosted: 07 Jan 2022, 23:46 
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Username Protected wrote:
I fly mine at 20deg below EGT redline at 97% engine speed (as recommended by Honeywell’s engineers when I bought it) which usually burns 75-80gph and yields around 310-315kts. It usually cruises pitched up about 2.5 degrees according to the G600 and the other two independent AI’s. I bought mine from Mike Laver. He owned my 50AF before his current -ED. He’s a very honest guy. Based on his reputation, I bought mine without pre-buy and very little has gone wrong in 5.5 years.


Thomas,

What Honeywell engineers?


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