---------------------------------------------------------- TeamGrumman-List Digest Archive --- Total Messages Posted Fri 01/02/04: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:16 AM - Official Usage Guideline [Please Read] [Monthly Posting] (Matt Dralle) 2. 07:26 AM - Re: Mt-Prop From the Owner (flyv35b) 3. 08:51 AM - Re: Mt-Prop From the Owner (Eric Finley) 4. 07:56 PM - Fixed vs constant speed prop (KahnSG@aol.com) ________________________________ Message 1 _____________________________________ Time: 12:16:07 AM PST US From: Matt Dralle Subject: TeamGrumman-List: Official Usage Guideline [Please Read] [Monthly Posting] DNA: do not archive --> TeamGrumman-List message posted by: Matt Dralle Dear Lister, Please read over the TeamGrumman-List Usage Guidelines below. The complete TeamGrumman-List FAQ including these Usage Guidelines can be found at the following URL: http://www.matronics.com/FAQs/TeamGrumman-List.FAQ.html Thank you, Matt Dralle Matronics Email List Administrator ****************************************************************************** TeamGrumman-List Usage Guidelines ****************************************************************************** The following details the official Usage Guidelines for the TeamGrumman-List. You are encouraged to read it carefully, and to abide by the rules therein. Failure to use the TeamGrumman-List in the manner described below may result in the removal of the subscribers from the List. TeamGrumman-List Policy Statement The purpose of the TeamGrumman-List is to provide a forum of discussion for things related to this particular discussion group. 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This will only cause a pointless debate that will hurt feelings, waste bandwidth and resolve nothing. ------- [This is an automated posting.] ________________________________ Message 2 _____________________________________ Time: 07:26:11 AM PST US From: "flyv35b" Subject: Re: TeamGrumman-List: Mt-Prop From the Owner --> TeamGrumman-List message posted by: "flyv35b" I then brought the power back and squared it out 25" MP > and 2500 RPM. TAS at 2500 was 138 knots, best I've seen so far with the new > prop, and further more reducing the power to 23" MP and 2300 RPM, TAS stayed > the same at 138 knots just as expected. Do you really believe that you can substantially reduce the power output of the engine and the plane will fly just as fast as it did at the higher power setting? Believe me, the speed will not remain the same with 2" less MP and 200 rpm less unless you are still slowing down or descending. It's nice when you can descend at 750 FPM and cruise in > the upper yellow limit of the airspeed indicator and still only be pulling > 2500 RPM, it makes for great ground speeds sometimes in excess of 175 knots > (not inlcuding the wind). With no wind I guess that would mean that your TAS and ground speed would be the same. At lower altitudes and colder winter air that would also mean you are operating right up near the redline IAS (172 kts.). Hmm! Cliff A&P/IA ----- Original Message ----- From: "Eric Finley" Subject: TeamGrumman-List: Mt-Prop From the Owner > --> TeamGrumman-List message posted by: "Eric Finley" > > From my experience flying light twins, and all other complex airplanes, its > always full throttle and full prop (exceeding the red line limits) until a > safe altitude is reached. As far as the 2500 RPM limit is concerned, there > is no doubt in my mind it should be complied with, especially in cruise > flight. However for takeoff I have been using max RPM, generating about > 2650, MP was under red line (just as you do in any other airplane). > Yesterday I saw a climb rate of 1750 FPM all the way to a 1000 Feet MSL (90 > knots, "2" 175 lb pilots and fuel to the tabs approx 40 gallons). Upon > reaching 1000 MSL, I then brought the power back and squared it out 25" MP > and 2500 RPM. TAS at 2500 was 138 knots, best I've seen so far with the new > prop, and further more reducing the power to 23" MP and 2300 RPM, TAS stayed > the same at 138 knots just as expected. If any beneficial gains are made due > to the installation of the prop, they are made on climb outs and quick well > planned descents. It's nice when you can descend at 750 FPM and cruise in > the upper yellow limit of the airspeed indicator and still only be pulling > 2500 RPM, it makes for great ground speeds sometimes in excess of 175 knots > (not inlcuding the wind). This week will be the experimental week, basically > trying to figure out what works best in different configurations, so I'll > keep you guys posted. > > Eric Finley CFI > AA-5B N254 > > Get reliable dial-up Internet access now with our limited-time introductory > > ________________________________ Message 3 _____________________________________ Time: 08:51:33 AM PST US From: "Eric Finley" Subject: Re: TeamGrumman-List: Mt-Prop From the Owner --> TeamGrumman-List message posted by: "Eric Finley" "Do you really believe that you can substantially reduce the power output of the engine and the plane will fly just as fast as it did at the higher power setting? Believe me, the speed will not remain the same with 2" less MP and 200 rpm less unless you are still slowing down or descending." Funny how that works isnt it, grab a 172RG manual or POH, look at the cruise perfomance numbers. The difference between 25"MP and 2500 and running the plane at 23"MP 2300 RPM is only 1 knot TAS, but wait reducing power that much and dropping the RPM another 200 surely would slow the airplane down drastically wouldnt it? It's not rocket science, developing extra horsepower simply doesnt produce huge increases in TAS, come on it goes back to your private pilot days and simple aerodynamics. To put it simply, as you know parasite drag increases as you fly faster, right? Oh and wait doesnt your prop create drag too? But now with a constant speed prop, you have control over that drag. Now let me think by slowing the prop down are we decreasing or increasing drag, well that would be decreasing drag. Meaning decreasing the overall drag of the airplane, finally resulting in less power to maintain the same TAS or slightly below within 1 or 2knots max. Grab the book " Aerodynamics for Naval Aviators " and you can read all about it. After all would you really argue with the NAVY. Eric Tired of slow downloads? Compare online deals from your local high-speed providers now. https://broadband.msn.com ________________________________ Message 4 _____________________________________ Time: 07:56:46 PM PST US From: KahnSG@aol.com Subject: TeamGrumman-List: Fixed vs constant speed prop teamgrumman-list@matronics.matronics.com --> TeamGrumman-List message posted by: KahnSG@aol.com Click here: Penn Yan Aero Service STC / Page 3 http://www.sensenich.com/stc/pyhwkpg3.htm This gives reasons why the Sensenich fixed prop may be better than C/S props Steve '79 Tiger