RV-List Digest Archive

Tue 06/08/10


Total Messages Posted: 3



Today's Message Index:
----------------------
 
     1. 01:41 PM - Re: some approx V speeds (William Dean)
     2. 09:00 PM - Replacing Fuel Level Senders... (Matt Dralle)
     3. 11:42 PM - Re: Replacing Fuel Level Senders... (Vanremog@AOL.COM)
 
 
 


Message 1


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    Time: 01:41:02 PM PST US
    From: William Dean <billoves2fly@yahoo.com>
    Subject: Re: some approx V speeds
    =0A=0A=0A=0A=0A________________________________=0AFrom: "HCRV6@comcast.net" <HCRV6@comcast.net>=0ATo: rv-list@matronics.com=0ASent: Sun, June 6, 2010 3:23:32 PM=0ASubject: Re: RV-List: some approx V speeds=0A=0A=0AEd,=0A=0ATh anks for that.=C2- Without giving it much thought (make that any thought) my reaction was, what does it matter what kind of prop?=C2- Obviously it does as soon as one recognizes the effect of airspeed/RPM on HP with the f ixed pitch props.=0A=0AMy experience is consistent with your observation, a t 120 MPH my Catto prop allows me to climb with any of my buddies with CS p rops.=C2- They always get a bit of a jump on me at takeoff but as soon as I accelerate to 120 to 130 I can catch up.=0A=0AHarry Crosby=0ARV-6 N16CX, 695 hours=0A=0A----- Original Message -----=0AFrom: "Ed Anderson" <eanders on@carolina.rr.com>=0ATo: rv-list@matronics.com=0ASent: Friday, June 4, 201 0 4:41:21 PM GMT -08:00 US/Canada Pacific=0ASubject: RE: RV-List: some appr ox V speeds=0A=0A=0AHarry,=0A=C2-=0AWhen I first did my airspeed checks w ith my fixed pitch prop RV-6A, I couldn=99t get anywhere near the per formance/airspeed figures that Van quoted.=C2- It turns out his figures a re for engines with a constant speed prop.=0A=C2-=0AMy best climb speed V y turns out to be 120 MPH IAS, considerably higher than the Van=99s f igure.=0A=C2-=0AI=99m sure there is someone out there that can give you a more understandable explanation =93 but it goes something like this.=0A=C2-=0AHere is how I see it =93 with a constant speed prop , you can get more HP at slow airspeeds by making the pitch finer producing less load on the engine, which results in more RPM which results in more H P.=C2- When you are discussing climb it=99s the EXTRA HP above that required to maintain level flight than causes you to climb.=C2- If you c an increase your HP above that necessary for level flight, =C2-you can in crease your climb rate at any airspeed (well, just about)..=0A=C2-=0AWith a fixed pitch prop, you have the maximum load on the prop and therefore th e engine at slower airspeeds during climb-out, that keeps the rpm lower =C2 -and therefore HP down compared to a constant speed prop.=C2- Therefore , in order to get more climb you need to produce more HP, with a fixed pitc h prop you do that by flying a higher airspeed unloading the prop and engin e a bit thereby permitting more rpm and HP and higher climb rate.=0A=C2- =0AEd=0A=C2-=0AEd Anderson=0ARv-6A N494BW Rotary Powered=0AMatthews, NC =0Aeanderson@carolina.rr.com=0Ahttp://www.andersonee.com=0Ahttp://www.dmack .net/mazda/index.html=0Ahttp://www.flyrotary.com/=0Ahttp://members.cox.net/ rogersda/rotary/configs.htm#N494BW=0Ahttp://www.rotaryaviation.com/Rotorhea d%20Truth.htm=0A=0A________________________________=0A=0AFrom:owner-rv-list -server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of HCRV6@comcast.net=0ASent: Friday, June 04, 2010 4:09 PM=0ATo: rv-list@m atronics.com=0ASubject: Re: RV-List: some approx V speeds=0A=C2-=0APlease explain:=0A=0AWhether you have=C2-fixed pitch or constant speed prop mak es a difference.=0A=0AHarry Crosby=0ARV-6 N16CX, 693 hours=0A=0A=0A=C2- =0A=C2-=0Ahttp://www.matronics.com/Navigator?RV-List=0Ahttp://forums.matr onics.com=0Ahttp://www.matronics.com/contribution=0A=C2-=0A=0A=0At="_bl ank">http://www.matronics.com/Navigator?RV-List=0Atp://forums.matronics.com =========0A=0A=0A


    Message 2


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    Time: 09:00:52 PM PST US
    From: Matt Dralle <dralle@matronics.com>
    Subject: Replacing Fuel Level Senders...
    Dear Listers, Well, okay, so I've resigned myself to replacing my Princeton capacitance fuel level probes with the standard S&W float probea from Van's. Has anyone replaced these without removing the wing or the fuel tank from the airplane? Basically just doing it from underneath the airplane through the gap afforded by the fuselage-to-wing fairing? Is this even possible? I know that it won't be possible to remove the Princeton units without destroying them, but can the S&W probes be installed? If I can do it without pulling the fuel tanks or wings off, then I might just tackle this sooner than later. But if the tanks have to come off, then I might procrastinate more and enjoy the great flying weather. That being said, I'm going in for paint in either August or October and it has to be complete before then either way. Arg, why couldn't those Princeton probes just work? Geeze, how much do you have to spend to get a product that works. How frustrating. So, how accurate are the bending dimensions on the Van's plans for the S&W float arms? I've got no way to test or trial fit these units so its a one-shot deal. I've already pulled the probes out once, I definitely don't want to do this again! Thanks for the insight... Matt Dralle RV-8 #82880 N998RV http://www.mattsrv8.com - Matt's RV-8 Construction Blog http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel Status: Enjoying The Fruits of 2500 Hours of Labor!


    Message 3


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    Time: 11:42:04 PM PST US
    From: Vanremog@AOL.COM
    Subject: Re: Replacing Fuel Level Senders...
    Matt- I'm going to go on record as recommending you drain and remove the tanks to do this job. If you can do it thru the wing fairing gap you are a better man than I. N1GV (RV-6A Flying 944TTAE Silicon Valley, CA) "I know what you're thinking, punk," hissed Wordy Harry to his new editor, "you're thinking, 'Did he use six superfluous adjectives or only five?' - and to tell the truth, I forgot myself in all this excitement; but being as this is English, the most powerful language in the world, whose subtle nuances will blow your head clean off, you've got to ask yourself one question: 'Do I feel loquacious?' - well do you, punk?" In a message dated 6/8/2010 9:01:32 P.M. Pacific Daylight Time, dralle@matronics.com writes: Well, okay, so I've resigned myself to replacing my Princeton capacitance fuel level probes with the standard S&W float probea from Van's. Has anyone replaced these without removing the wing or the fuel tank from the airplane? Basically just doing it from underneath the airplane through the gap afforded by the fuselage-to-wing fairing? Is this even possible? I know that it won't be possible to remove the Princeton units without destroying them, but can the S&W probes be installed? If I can do it without pulling the fuel tanks or wings off, then I might just tackle this sooner than later. But if the tanks have to come off, then I might procrastinate more and enjoy the great flying weather. That being said, I'm going in for paint in either August or October and it has to be complete before then either way.




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