KIS-List Digest Archive

Thu 02/03/11


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     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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    Time: 01:04:41 AM PST US
    Subject: Re: SV: Prince P-tip Propeller Users?
    From: Keith.Miller@esa.int
    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 |------------> | From: | |------------> >------------------------------------------------------------------------------------------------------------------------------------------------------| |"BlueSkyFlier" <bleuskyfly@teledynamix.com> | >------------------------------------------------------------------------------------------------------------------------------------------------------| |------------> | To: | |------------> >------------------------------------------------------------------------------------------------------------------------------------------------------| |kis-list@matronics.com | >------------------------------------------------------------------------------------------------------------------------------------------------------| |------------> | Date: | |------------> >------------------------------------------------------------------------------------------------------------------------------------------------------| |02/02/2011 00:55 | >------------------------------------------------------------------------------------------------------------------------------------------------------| |------------> | Subject: | |------------> >------------------------------------------------------------------------------------------------------------------------------------------------------| |KIS-List: Re: SV: Prince P-tip Propeller Users? | >------------------------------------------------------------------------------------------------------------------------------------------------------| |------------> | Sent by: | |------------> >------------------------------------------------------------------------------------------------------------------------------------------------------| |owner-kis-list-server@matronics.com | >------------------------------------------------------------------------------------------------------------------------------------------------------| 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 -------- _________________________________________ Read this topic online here: http://forums.matronics.com/viewtopic.php?p=329235#329235


    Message 2


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    Time: 10:49:06 AM PST US
    Subject: Re: SV: Prince P-tip Propeller Users?
    From: "BlueSkyFlier" <bleuskyfly@teledynamix.com>
    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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