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1. 01:04 AM - Re: Re: SV: Prince P-tip Propeller Users? (Keith.Miller@esa.int)
2. 10:49 AM - Re: SV: Prince P-tip Propeller Users? (BlueSkyFlier)
Message 1
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Subject: | Re: SV: Prince P-tip Propeller Users? |
Alfred
Your KIS with a C172 nose leg is most likely unique, Out of curiosity next
time you are at the airfield, can you measure the vertical distance from the
centre of the spinner to the ground.
Maybe a bit of useless information , but ....
The build manual states "Exact engine shaft position will vary according to
the engine utilized and the factory cowling ordered with the kit. Lycoming
and Continental engines are to be installed with the thrust line level at
WL41 and with 1 degrees right thrust".
My understanding of this is that the centre of the spinner should be 41"
above the ground, with a 66.5 "prop this would give you 7.5"of prop
clearance (19cm). However each TR1 is different and it depends if it sits
on the ground with the door sills level or not , the engine mount that was
used and how much material was removed from the main gear legs during the
build and the position of the main gear etc
My recommendations that 7.5" is the absolute minimum clearance ,
particularly if you decide to operate on grass. I have on three occasions
managed to suck up a stone and ding the brass leading edge. also I had one
occasion where i was taxing over particularly rough grass and smashed the
prop completeley.
With the same Chris lodge prop and the IO240 B1B , I can get mine
(eventually )to 2750 rpm flat out in the cruise, I am however on my third
Chris lodge prop ( all supposed to be the same) and each one has been
slightly different in performance.
Keith
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|"BlueSkyFlier" <bleuskyfly@teledynamix.com>
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|kis-list@matronics.com
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| Date: |
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|02/02/2011 00:55
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|KIS-List: Re: SV: Prince P-tip Propeller Users?
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|owner-kis-list-server@matronics.com
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Thank you for the information about your prop performance Hans Christian.
My current prop is a Chris Lodge 66.5" dia x 68" pitch. Static rpm is 2200
and max rpm in level flight is 2500 at low altitude. However, with that 2500
rpm I see 140 knots IAS - not yet quite sure how accurate that airspeed
indicator is.
Let me use this opprtunity to also thank you in person for the excellent POH
you compiled for the KIS2. It was an invaluable source of information when I
was evaluating the KIS2 type as a potential buyer.
I agree with your comment regarding maintaining a fairly flat/level attitude
until touchdown. With the laminar flow wing the KIS2 does not like to have
its nose pointed too far skyward and tends to bite back with a forward
rotating moment if you do pull it up too steeply, especially with full flaps
down.
With one stage flaps she seems quite well behaved and has no trouble keeping
the nose up after touch-down. I am quite happy with her handling, but would
just like a little extra ooomph when I push in the throttle for the odd bump
or go-round :o)
Seems that my Chris Lodge propeller will do for long range high level
cruising. So perhaps I'll keep that for the odd long trip and optimise the
Prince P-tip for more performance at the lower end of the range.
Regards,
Alfred
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Message 2
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Subject: | Re: SV: Prince P-tip Propeller Users? |
Hi Keith,
Grin ... if you are on the 3rd prop as you say, I think I'll want to make my ground
clearance a bit more than 7.5" :o).
One would have to set the travel stop ring on the C172 nose gear to ensure minimum
clearance level for the worst case nose-dip compression. With the oleo uncompressed
the usual clearance for taxiing would be quite a bit more than worst
case. If memory serves I currently have about 12", but I'll be measuring it
all up again anyway to see what the maximum prop length is I can get away with
... would like to try for 72" if possible.
The Chris Lodge prop runs really smoothly and will eventually get to around 2700
rpm max in level cruise - after half an hour of trying that is :o)) BUT - and
it is a big but - the low speed thrust is not good enough and, to my mind adds
risk to executing a safe go-round at late stage during landing. That's why
it will be replaced.
Cheers,
Alfred
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=329474#329474
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