---------------------------------------------------------- Seaplane-List Digest Archive --- Total Messages Posted Sat 06/16/07: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:51 AM - Re: Float performance tool (Peter C) 2. 06:46 AM - Re: Float performance tool (John A. Nielsen) ________________________________ Message 1 _____________________________________ Time: 03:51:39 AM PST US From: "Peter C" Subject: Re: Seaplane-List: Float performance tool John, what is your data so I can play with the formula. There isn't much reason why my formula should work. I have no real knowledge of the relationship between float volume, hp, weight and wing area. It was just curious that it seemed to be right for a 170 and a Rans. Peter ----- Original Message ----- From: "John A. Nielsen" Sent: Friday, June 15, 2007 6:21 PM Subject: Re: Seaplane-List: Float performance tool > > > I entered my plane's data and it predicted 11 seconds. Proven by this > video taken Sunday, my take off is more like 6 seconds. > http://www.youtube.com/watch?v=iEQ-1yzL8XE > John Nielsen > Bloomer WI > Challenger II on Puddle Jumper Amphibs > > Peter C wrote: >> Would any of you guys on floats provide some examples of what take-off >> times >> you are getting? >> The attached spread sheet contains a simplified version of the formula on >> the Stinson site. This one just multiplies wing loading, power loading >> and >> float loading times a constant. >> >> The two Rans examples look pretty good in that they are close to my >> actual >> numbers. The 170 number is also pretty close. The original formula gave >> me a >> time of 5 or six seconds which is way off. If you play with different >> weights this one seems to work. Not sure if variations in hp work as >> well. >> Since I'll also be trying two more sets of floats on this plane the >> affect >> of buoyancy will also be stest. >> Peter >> > > > ________________________________ Message 2 _____________________________________ Time: 06:46:19 AM PST US From: "John A. Nielsen" Subject: Re: Seaplane-List: Float performance tool Here is your file back with the data from my plane. Also attached is the complete W&B and performance spec sheet for the Challenger on wheels and floats. Hope this helps. John Peter C wrote: > > John, what is your data so I can play with the formula. There isn't much > reason why my formula should work. I have no real knowledge of the > relationship between float volume, hp, weight and wing area. It was just > curious that it seemed to be right for a 170 and a Rans. > Peter > ----- Original Message ----- From: "John A. Nielsen" > To: > Sent: Friday, June 15, 2007 6:21 PM > Subject: Re: Seaplane-List: Float performance tool > > >> >> >> I entered my plane's data and it predicted 11 seconds. Proven by this >> video taken Sunday, my take off is more like 6 seconds. >> http://www.youtube.com/watch?v=iEQ-1yzL8XE >> John Nielsen >> Bloomer WI >> Challenger II on Puddle Jumper Amphibs >> >> Peter C wrote: >> >>> Would any of you guys on floats provide some examples of what >>> take-off times >>> you are getting? >>> The attached spread sheet contains a simplified version of the >>> formula on >>> the Stinson site. This one just multiplies wing loading, power >>> loading and >>> float loading times a constant. >>> >>> The two Rans examples look pretty good in that they are close to my >>> actual >>> numbers. The 170 number is also pretty close. The original formula >>> gave me a >>> time of 5 or six seconds which is way off. If you play with different >>> weights this one seems to work. Not sure if variations in hp work as >>> well. >>> Since I'll also be trying two more sets of floats on this plane the >>> affect >>> of buoyancy will also be stest. >>> Peter >>> >> >> >> >> >> >> > > > > > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message seaplane-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Seaplane-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/seaplane-list Browse Digests http://www.matronics.com/digest/seaplane-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.