68" diameter? What kind of gear legs do you have? Brian Kraut Engineering Alternatives, Inc. www.engalt.com
-----Original Message----- From: krnet-bounces+brian.kraut=engalt....@mylist.net [mailto:krnet-bounces+brian.kraut=engalt....@mylist.net]On Behalf Of Jeff Scott Sent: Friday, June 17, 2005 4:54 PM To: kr...@mylist.net Subject: Re: KR> glide rato.. That's probably just the compression ratio. They typical Cont and Lyc are pretty low compression. The O-235 on my Tomahawk and O-200 on my KR have both been upgraded to high compression pistons. They are very stiff to pull against the compression. At tiny bump in the compression ratio makes a huge difference in the way it feels when you pull the prop through. I've heard that referred to as "the engine has good rubber". I would bet that the O-200 on my KR won't windmill at glide speeds, even with the 68" diameter prop that I use. Of course if you're referring to the bearings being tight, that's an assembly issue, but that would also show itself via oil pressure and/or metal in the oil filter/screen in very short order. Come back for the spam can guys: Tell them that theirs would be tight too if they had any compression. Jeff Scott Los Alamos, NM -- "Al Friesen" <nesei...@telus.net> wrote: All, I have been told in the hangar group that my VW Revmaster is way too tight. All the conts and lyks are easier to turn over than my VW. Any come backs on these Spam can guys. ? ----- Original Message ----- From: "Golden, Kevin" <kevin.gol...@churchdwight.com> To: "'KRnet'" <kr...@mylist.net> Sent: Friday, June 17, 2005 7:15 AM Subject: RE: KR> glide rato.. >A windmilling prop does more than disturb air over the airframe. A > windmilling prop will cause a huge amount of drag that is NEAR equal to > the > rotational disc of the prop. > > Not to worry. I haven't seen a VW or corvair windmill. Lycoming and > Continentals will. > > Kevin. > > > > -----Original Message----- > From: Dennis Mingear [mailto:dennisming...@yahoo.com] > Sent: Friday, June 17, 2005 9:02 AM > To: KRnet > Subject: Re: KR> glide rato.. > > If the prop stops in a horizontal position it will > disturb the airflow over the wing, making it seem > smaller than it actually is, this will reduce the > planes L/D. > > If the prop stops vertically the airflow over the wing > is not disturbed and you have more effective wing > area, producing more lift, which improves the planes > L/D. > > If the prop is windmilling it is intermittantly > disturbing the airflow over the wing which is hurting > the wings ability to produce lift and hurting the > planes L/D. > > Denny ... > > --- "Kenneth B. Jones" <kenbjo...@cinci.rr.com> wrote: > >> Perhaps the stopped prop is less drag because it's >> stalled. >> >> Below is data taken from my flight test. My idle >> setting was about 800 to >> 900 rpm, a little high, at the time. Speeds are >> indicated knots. My plane >> stalls at about 50 knots indicated so I didn't check >> the glide below 60 kts. >> Surely the ratio will start back the other way >> before it stalls. I have a >> KR-2 with Diehl wings, 3 blade Warp drive taper >> blade 58" prop set at 19.5 >> degrees at the tip, A65, empty weight is 623 lbs., >> full fuel is 14 gal and I >> weigh about 180. >> >> Glide >> Speed Descent Distance Glide >> kts ft/min NM/1000 ft. Ratio >> 60 400 2.50 15.18 >> 65 442.5 2.45 12.93 >> 70 525 2.22 11.73 >> 75 625 2.00 10.56 >> 80 750 1.78 9.39 >> 85 800 1.77 9.35 >> 90 900 1.67 8.80 >> 95 1100 1.44 7.60 >> 100 1500 1.11 5.87 >> >> >> BTW, Bill's 2.5 miles per 1000 ft altitude is a >> glide ratio of 13.2 : 1 (if >> I calculated correctly). >> >> Ken Jones, kenbjo...@cinci.rr.com >> Sharonville, OH >> N5834, aka The Porkopolis Flying Pig >> >> ----- Original Message ----- >> From: "Barry Kruyssen" <k...@bigpond.com> >> To: "KRnet" <kr...@mylist.net> >> Sent: Thursday, June 16, 2005 6:31 PM >> Subject: Re: KR> what a day./ glide rato.. >> >> >> > >> > ----- Original Message ----- From: larry flesner >> I doubt if a stopped >> > propeller is going to triple that number >> > >> > A stopped prop actually produces less drag, don't >> know the reason but have >> > tried it in self launch gliders (without >> feathering the prop) both idling >> > engine and stoped, there is noticeably less drag >> when the prop was >> > stopped. Also it is better for the prop to stop >> vertically so any >> > vortices from the prop don't upset the air flow >> over the wing, so I'm told >> > but I couldn't tell the difference :-) >> > >> > regards >> > Barry Kruyssen >> >> >> >> >> _______________________________________ >> Search the KRnet Archives at >> http://www.maddyhome.com/krsrch/index.jsp >> to UNsubscribe from KRnet, send a message to >> krnet-le...@mylist.net >> please see other KRnet info at >> http://www.krnet.org/info.html >> > > > "I can train a monkey to wave an American flag. That does not make the > monkey patriotic." > > Scott Ritter > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > *The information contained in this message may be confidential and/or > subject to legal privilege, and is for the use of the intended addressee > only. Any unauthorized use, dissemination or copying of the information > in this message is strictly prohibited. If you have received this message > in error, please notify the sender immediately and delete this message.* > > > > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > > > -- > No virus found in this incoming message. > Checked by AVG Anti-Virus. > Version: 7.0.323 / Virus Database: 267.7.8/22 - Release Date: 6/17/2005 > > _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
