---------------------------------------------------------- Rocket-List Digest Archive --- Total Messages Posted Thu 09/06/07: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:40 AM - 3 blade MT vs the Hartzell fat paddle 2 blade (Michael W Stewart) 2. 08:53 AM - Re: 3 blade MT vs the Hartzell fat paddle 2 blade (Tom Martin) 3. 05:07 PM - Re: 3 blade MT vs the Hartzell fat paddle 2 blade (Michael W Stewart) 4. 05:27 PM - Re: 3 blade MT vs the Hartzell fat paddle 2 blade (Mark Swaney) 5. 05:55 PM - canopy safety latch (Jim Stone) 6. 06:36 PM - PC680 source (Jim Stone) 7. 06:49 PM - Re: PC680 source (Walter Tondu) ________________________________ Message 1 _____________________________________ Time: 07:40:42 AM PST US Subject: Rocket-List: 3 blade MT vs the Hartzell fat paddle 2 blade From: Michael W Stewart Thought you guys might be interested in some real world data on these 2 props. Enjoy, Mike http://www.mstewart.net/super8/performance/propcomparisons.htm ________________________________ Message 2 _____________________________________ Time: 08:53:05 AM PST US From: "Tom Martin" Subject: RE: Rocket-List: 3 blade MT vs the Hartzell fat paddle 2 blade Mike Good data. From my flight tests on my HRII I felt that I dropped three to four knots going from the two blade Hartzell to the three blade MT. I did not, at that time, have the benefit of your prop clocking information so the difference in smoothness was worth the swap for me. Did you do any flight tests at lower rpms? Most of my cross country work is at 21 to 2200 rpm and 23=94. Although I do not have data to support my feeling, I suspect that there is not as much difference in the two props at that power setting. Metal blades have the advantage of a thinner profile and it is possible that that as you drop rpms that is not as important. On my current EVO I have a three blade MT and I would really like to be able to try a two blade on the plane with the clocking change. I do have some experience with a three blade Hartzell and it is my opinion that it is also faster than the MT but this has not been proven by tests. The main problem with the three blade Hartzell is the additional 22 lbs which will work on a F1 but is too heavy for a HRII due to the landing gear geometry. Good work. Tom Martin _____ From: owner-rocket-list-server@matronics.com [mailto:owner-rocket-list-server@matronics.com] On Behalf Of Michael W Stewart Sent: September 6, 2007 10:39 AM Subject: Rocket-List: 3 blade MT vs the Hartzell fat paddle 2 blade Thought you guys might be interested in some real world data on these 2 props. Enjoy, Mike HYPERLINK "http://www.mstewart.net/super8/performance/propcomparisons.htm"http://ww w.m stewart.net/super8/performance/propcomparisons.htm "http://www.matronics.com/Navigator?Rocket-List"http://www.matronics.com/ Nav igator?Rocket-List "http://forums.matronics.com"http://forums.matronics.com 06/09/2007 8:36 AM 06/09/2007 8:36 AM ________________________________ Message 3 _____________________________________ Time: 05:07:10 PM PST US Subject: Re: Rocket-List: 3 blade MT vs the Hartzell fat paddle 2 blade From: Michael W Stewart No I did not go below 2200 rpm so I have no good data about that. I would love to try the 2 blade hartz symetar. Hartz says its worth another 3 knots for me. We could get together one weekend and have a prop swapping extravaganza! Too bad the spinners are different. Best Mike ----- Original Message ----- From: "Tom Martin" [fairlea@amtelecom.net] Sent: 09/06/2007 09:52 AM Subject: RE: Rocket-List: 3 blade MT vs the Hartzell fat paddle 2 blade Mike Good data. From my flight tests on my HRII I felt that I dropped three to four knots going from the two blade Hartzell to the three blade MT. I did not, at that time, have the benefit of your prop clocking information so the difference in smoothness was worth the swap for me. Did you do any flight tests at lower rpms? Most of my cross country work is at 21 to 2200 rpm and 23=9D. Although I do not have data to support my fe eling, I suspect that there is not as much difference in the two props at that power setting. Metal blades have the advantage of a thinner profile and it is possible that that as you drop rpms that is not as important. On my current EVO I have a three blade MT and I would really like to be able to try a two blade on the plane with the clocking change. I do have some experience with a three blade Hartzell and it is my opinion that it is also faster than the MT but this has not been proven by tests. The main problem with the three blade Hartzell is the additional 22 lbs which will work on a F1 but is too heavy for a HRII due to the landing gear geometry. Good work. Tom Martin _____ From: owner-rocket-list-server@matronics.com [mailto:owner-rocket-list-server@matronics.com] On Behalf Of Michael W Stewart Sent: September 6, 2007 10:39 AM Subject: Rocket-List: 3 blade MT vs the Hartzell fat paddle 2 blade Thought you guys might be interested in some real world data on these 2 props. Enjoy, Mike HYPERLINK "http://www.mstewart.net/super8/performance/propcomparisons.htm"http://www.m stewart.net/super8/performance/propcomparisons.htm "http://www.matronics.com/Navigator?Rocket-List"http://www.matronics.com/Nav igator?Rocket-List "http://forums.matronics.com"http://forums.matronics.com 06/09/2007 8:36 AM 06/09/2007 8:36 AM ________________________________ Message 4 _____________________________________ Time: 05:27:35 PM PST US From: Mark Swaney Subject: Re: Rocket-List: 3 blade MT vs the Hartzell fat paddle 2 blade Mike, Your data only lists altitude, not whether it was indicated, pressure of density altitude. It can make a real big difference in making comparisons. Thanks, Mark Swaney National Test Pilot School On Sep 6, 2007, at 5:04 PM, Michael W Stewart wrote: > > > No I did not go below 2200 rpm so I have no good data about that. > I would love to try the 2 blade hartz symetar. Hartz says its worth > another 3 knots for me. > We could get together one weekend and have a prop swapping > extravaganza! Too bad the spinners are different. > Best > Mike > > ----- Original Message ----- > From: "Tom Martin" [fairlea@amtelecom.net] > Sent: 09/06/2007 09:52 AM > To: > Subject: RE: Rocket-List: 3 blade MT vs the Hartzell fat paddle 2 > blade > > > Mike > > = Good data. From my flight tests on my HRII I felt that > I dropped three = to four knots going from the two blade Hartzell to > the three blade MT. I did not, at that time, have the benefit of your > prop clocking information so the difference in smoothness was worth > the swap for me. = Did you do any flight tests at lower rpms? Most > of my cross country = work is at 21 to 2200 rpm and 23. Although I > do not have data to = support my feeling, I suspect that there is not > as much difference in the two = props at that power setting. Metal > blades have the advantage of a thinner = profile and it is possible > that that as you drop rpms that is not as important. = On my current > EVO I have a three blade MT and I would really like to be = able to > try a two blade on the plane with the clocking change. I do have = > some experience with a three blade Hartzell and it is my opinion that > it is = also faster than the MT but this has not been proven by tests. > The main problem with = the three blade Hartzell is the additional 22 > lbs which will work on a F1 = but is too heavy for a HRII due to the > landing gear geometry. Good = work. > > > > Tom = Martin > > > > > From: owner-rocket-list-server@matronics.com > [mailto:owner-rocket-list-server@matronics.com] On Behalf Of Michael W > Stewart > Sent: September 6, 2007 = 10:39 AM > To: rocket-list@matronics.com > Subject: Rocket-List: 3 = blade MT vs the Hartzell fat paddle 2 blade > > > > Thought you guys might be interested in some = real world data on > these 2 props. > Enjoy, > Mike > h= ttp://www.mstewart.net/super8/performance/propcomparisons.htm > < > /pre> > > http://www.matron > ics.com/Navigator?Rocket-List > > > http://forums.matronics.com > > > > 06/09/2007 8:36 AM > > > 06/09/2007 8:36 AM > > > ========================3 > D==================== > tp://www.matronics.com/Navigator?Rocket-List > ========================3 > D==================== > cs.com > ========================3 > D==================== > > ________________________________ Message 5 _____________________________________ Time: 05:55:36 PM PST US From: "Jim Stone" Subject: Rocket-List: canopy safety latch I've got a tip over style canopy with the Harmon handle to open, close and latch it. Is there a need or requirement for more than that? BTW, mechanism is very firm to operate in both directions but possibly could work loose during flight. Van sells a latch for the RV-4, will that work on the HR? Thanks, Jim Stone Louisville First flight prep ________________________________ Message 6 _____________________________________ Time: 06:36:47 PM PST US From: "Jim Stone" Subject: Rocket-List: PC680 source Not many venders out there selling it for a good price. My last two came from Sun battery in Florida, their website was not up today, don't know if they are still in business. Anyone know of a good place to get a new battery? Thanks, Jim ________________________________ Message 7 _____________________________________ Time: 06:49:43 PM PST US From: Walter Tondu Subject: Re: Rocket-List: PC680 source On 09/06 9:32, Jim Stone wrote: > Not many venders out there selling it for a good price. My last two came > from Sun battery in Florida, their website was not up today, don't know if > they are still in business. Anyone know of a good place to get a new > battery? > Thanks, Vans has them for $93.00. -- Walter Tondu http://www.rv7-a.com - Flying! http://www.evorocket.com - Building ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rocket-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Rocket-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/rocket-list Browse Digests http://www.matronics.com/digest/rocket-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.