ericparlow(at)hotmail.com
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 Posted: Wed Dec 20, 2006 3:28 pm Post subject: MT Prop? (now Turbo) |
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We're using a TIO-540-AK1A core from a Cessna T182T.
The AK1 is rated(or de-rated) at 235 bhp, 2400 rpm, to 20k ft.
Turning 2700 rpm it puts out 260 bhp.
The IO-540-D4A5 weighs 400 lbs which does not include the exhaust system.
The TIO-540-AK1A weighs of 472 lbs. including the exhaust system.
We've calculated the installed engine weight to be +50 lbs over the IO.
The CG is 0.5" lower and 1" farther aft.
To help off-set the difference we've choosen to use the MT 3B prop (47 lbs
vs 57 lbs Hartzell 2B).
The prop CG is 25" forward of the engine CG.
Which gives 10 lbs reduction of prop equals 15.2 lbs of engine increase to
keep the same CG.
Now we're down to 35 lbs difference from a IO-540-D4A5 with a Hartzell 2B.
To maintain the forward CG limit of 107.84 with a 200 lbs pilot and no fuel
the result is:
-IO-540-D4A5 with Hartzell 2B requires 6 lbs in the baggage (1863 lbs net
weight)
-TIO-540-AK1A with MT requires 40 lbs in the baggage (1937 lbs net weight)
Resulting in a 74 lbs gross weight penalty for single pilot flying with the
turbo.
I'll just have to carry a 5 gal can of water around with me, or maybe an A/C
unit in back!
The cowl will be modified to fit around the turbo and a relocated air inlet.
Initial fit-up shows the lowest point of the turbo(oil drain) is approx 2"
outside the current cowl envelope.
This point is even with the level of the bottom of current cowl's air
inlet/cooling outlet area but off to the left side 9".
Which results in adding a 3" deep speed bulge to the lower left side of the
cowl in a localized area.
Yes, it was his kit.
ERic--
FWF
40014
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