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RE: performance

Subject: RE: performance
From: Plantragg Developments <ptag.dev@ukonline.co.uk>
Date: Fri, 15 Jan 1999 23:10:50

I can offer some detail of the MT Constant Speed Propeller. The factory 
recommended Type No.
MTV-7-F/157-106 But of course you will need to take their advice concerning 
your engine Type ,Power,Direction of Rotation,Engine Flange dimensions, 
etc. My engine is the Jabiru 3300 , and consideration of "moment of 
inertia" had to be given to the drive shaft gyroscopic forces , since the 
Jabiru  engine runs at propeller speed my installation is infact on the end 
of the crankshaft ! Initially the Factory provided the incorrect figures 
which the Jabiru designers limited the combination to 'straight and level 
flight' ! However when the 'chips were down ' the factory came up with the 
correct figures so Jabiru were prepared to authorise "lazy loops and lazy 
rolls" The factory will send you a questionaire which encompasses the 
flight performances which you require the propeller to be biased . The 
propeller is quite heavy at 32 lbs. so c of g consideration must be given. 
The Europa Factory are trialling the same propeller and Andy Draper said 
that the performance is AOK notwithstanding the fact that you must follow 
correct sequences to avoid unintentional engine overspeed, he is apparently 
considering writing some pilots notes on operations.
I also needed the MT people to send me their own spinner since the 
propeller will not fit the small standard Jabiru spinner  since it is as 
small as the MKI Europa Spinner is hidiously large. The resultant 
complication of all this is that I will have to put a "blister" on the top 
of the Jabiru cowling to match the propeller spinner diameter.( anyone 
needing a spare MKI Spinner and Cowling please call me up)
I will also probably need to modify the air intake ducts also.
The MT people will require prepayment , delivery is about 10 weeks and you 
will have to pay delivery charges C.O.D.
THey are currently wrestling with a problem since they didn't loose fit the 
drive bolts during propeller assembly and since they insist the bolts are 
inserted from the front to, aft the spinner flange and two more spacer 
flanges will need to be removed to get the bolts in, and since the 
propeller work has to be undertaken by an authorised person I'm expecting a 
German visitor soon!!!!.( never thought to ask Andy Draper if they had the 
same problem?)
Don't hesitate to e-mail me should you need any more info.
The MT factory e-mail address is :-  sales@mt-propeller.com Gerd 
R.Muehlbaur is President and will handle the sales and specification 
aspects of your enquiry then Eric Greindl will take over on production.
They are very helpful people but at their prices you certainly pay for it!!

Best regards
BOB HARRISON 337. Reg.G-PTAG
e-mail:- ptag.dev@ukonline.co.uk


-----Original Message-----
From:        Gramin@aol.com [SMTP:Gramin@aol.com]
Sent:        15 January 1999 20:21
Subject:        Re: performance

In a message dated 13/01/99  12:07:20,  100421.2123@compuserve.com writes:

<< Watch your CG, the MT is heavy.  >>

How heavy ? indeed how heavy is the Arplast.?  Having just done a baggage 
mod.
I could use some forward shift, subject to AUW of course, hence the 
interest.

Graham C. G-EMIN


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