---------------------------------------------------------- RV8-List Digest Archive --- Total Messages Posted Fri 04/30/10: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:13 AM - Re: Re: Taxi Test (edward Clegg) 2. 08:46 AM - Re: Re: Taxi Test (Jim Gray) ________________________________ Message 1 _____________________________________ Time: 08:13:53 AM PST US Subject: Re: RV8-List: Re: Taxi Test From: edward Clegg Just wondering, Is that a new engine and if it is has it been run on a test stand? Ed Clegg On Thu, Apr 29, 2010 at 8:50 PM, wrote: > Taxi tests are fine so long as they are not high speed. The definition > of high speed depends on the length of the runway. What Van is concerned > about is guys doing a high speed test and inadvertently getting airborne on > a flight they are not prepared for. His concern is well founded. > However, if the test run is done on an 8000' runway, the danger diminishes > greatly. One could actually get airborne and land again safely on that much > runway. I'm not advocating taxi tests that are so fast as to get airborne. > I believe 45 KIAS is more than enough for a taxi test. You will be able to > get the nose to pitch up (or raise the tail) without the danger involved > with an unplanned liftoff. And a long runway, even if done downwind, allows > the airplane to slow in idle power without overuse of the brakes. > I believe hot brakes on RVs occurs because the pilot (I did it) > inadvertently rides the brakes during taxi and the wheel pant restricts air > flow from cooling the brakes. A single taxi run is all that should be > attempted on one day. Two runs in a short time are almost guaranteed to > overheat the brakes. > We takeoff and land into the wind due to limited runway lengths. If one > had 3 miles of runway for an RV, then landing with or into the wind > makes little difference. The only difference would be ground speed at > touchdown which might cause a tiny bit of additional tire wear on downwind > landings. However, in most cases, our runway lengths are limited thus > dictating taking off and landing into the wind for safety. > Stan Sutterfield > > > I don't think that Van approves the "High Speed" Taxi. And I agree. > > Too many times when people have found themselves off the ground, totally > unprepared. > > You also saw the power of TO's and Landings down wind. I don't think there > is an airplane made today that allows more than a 10 knot tailwind. > > > * > > * > > ________________________________ Message 2 _____________________________________ Time: 08:46:56 AM PST US From: Jim Gray Subject: Re: RV8-List: Re: Taxi Test My question exactly. My engine builder wanted me to PUSH my airplane to the runway before the first flight, after a few very short test runs, primarily looking for leaks. Prior to that, it was run on a test stand for almost an hour, with sufficient cooling provided. Jim Gray N747JG RV-8 180 hours On Apr 30, 2010, at 9:12 AM, edward Clegg wrote: > Just wondering, Is that a new engine and if it is has it been run on > a test stand? > Ed Clegg > > On Thu, Apr 29, 2010 at 8:50 PM, wrote: > Taxi tests are fine so long as they are not high speed. The > definition of high speed depends on the length of the runway. What > Van is concerned about is guys doing a high speed test and > inadvertently getting airborne on a flight they are not prepared > for. His concern is well founded. > However, if the test run is done on an 8000' runway, the danger > diminishes greatly. One could actually get airborne and land again > safely on that much runway. I'm not advocating taxi tests that are > so fast as to get airborne. I believe 45 KIAS is more than enough > for a taxi test. You will be able to get the nose to pitch up (or > raise the tail) without the danger involved with an unplanned > liftoff. And a long runway, even if done downwind, allows the > airplane to slow in idle power without overuse of the brakes. > I believe hot brakes on RVs occurs because the pilot (I did it) > inadvertently rides the brakes during taxi and the wheel pant > restricts air flow from cooling the brakes. A single taxi run is > all that should be attempted on one day. Two runs in a short time > are almost guaranteed to overheat the brakes. > We takeoff and land into the wind due to limited runway lengths. If > one had 3 miles of runway for an RV, then landing with or into the > wind makes little difference. The only difference would be ground > speed at touchdown which might cause a tiny bit of additional tire > wear on downwind landings. However, in most cases, our runway > lengths are limited thus dictating taking off and landing into the > wind for safety. > Stan Sutterfield > > I don't think that Van approves the "High Speed" Taxi. And I agree. > > Too many times when people have found themselves off the ground, > totally > unprepared. > > You also saw the power of TO's and Landings down wind. I don't think > there > is an airplane made today that allows more than a 10 knot tailwind. > > > et="_blank">http://www.matronics.com/Navigator?RV8-List > tp://forums.matronics.com > _blank">http://www.matronics.com/contribution > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv8-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV8-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rv8-list Browse Digests http://www.matronics.com/digest/rv8-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.