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MD 600N vs AS350B3


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#21 Eric Hunt

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Posted 10 September 2017 - 17:07

The early 109 A series, even with the C20R engines and Wide Body mod, were Italian show ponies. With 2 on board and full fuel, went like a startled rabbit - 145kt cruise, 168kt Vne and a smooth ride.

 

However, put a backside on every seat and you have about 45 minutes of useful flight before seeking a top-up.

 

If any of the pax are cheeseburger-fed ole boys, they won't fit in the front seat.

 

Otherwise, a nice bird to fly.

 

But look at 109E and later models to get better engines, more useful space (the retractable gear goes into pods, not into the fuselage) and more modern electrics. The instrument panel on our 109A weighed 90kg with all those gyros. Get glass screens, cheaper, lighter, more reliable, and tell you a lot more.

 

Regarding the 2-engine thing: twins generally aren't fitted with engines that will allow a hover just on one. If they did, the engines would be fine when operating at their best, around 97% N1, but in cruise flight, when loafing along with their friend, they are sucking more fuel than you want to know about. Very inefficient.

 

Find yourself a graph showing total power required for flight - look at the big dip in the middle, where the machine is between 30 and 70 kt, using least power. Draw a horizontal line through the curve about two thirds between the bottom and the intersection on the left with the vertical axis. This is the power available on one engine. Draw another line at double the height of the first line - this is 2-engine power, way above the power needed for hover.

 

But back on one engine, you will see that it allows LEVEL flight at speeds between maybe 90kt and 30kt. Will not allow hover on one, but using a descending flight path and some gentle speed, a run-on landing is normally the go. 


Edited by Eric Hunt, 10 September 2017 - 17:08.

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#22 rmiller4292

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Posted 13 September 2017 - 21:25

PM Sent...


"most people respect the badge, everybody respects the gun."

#23 TrinityAviation

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Posted 18 September 2017 - 11:06

BIll,

    We look forward to meeting you this week, and helping you narrow down your helicopter search.






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