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peterc(at)pipcom.com
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 Posted: Sat Jun 09, 2007 1:30 pm Post subject: Float performance tool |
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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
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| Description: |
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Download |
| Filename: |
float_perf.xls |
| Filesize: |
13.5 KB |
| Downloaded: |
442 Time(s) |
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Malcolmbru(at)aol.com
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| Posted: Sat Jun 09, 2007 6:11 pm Post subject: Float performance tool |
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snaps(at)gotricounty.com (snaps(at)gotricounty.com) this guy will put a hole in any theory you can prove on paper. I herd he once took off from a pond with nothing moor than a pair of welding tanks ratchet strapped to the bottom of his ultralight. no kidding . his name is John Napp mal
See what's free at AOL.com.
[quote][b]
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raymondj(at)frontiernet.n
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| Posted: Sat Jun 09, 2007 10:20 pm Post subject: Float performance tool |
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Peter,
Wish I has something to add to your good work. No float experience but hope to build a pair for my e-lsa in the future.
Thanks for posting the results of your work.
Raymond Julian
Kettle River, MN
do not archive
[quote] --
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Sun Jun 10, 2007 5:58 am Post subject: Float performance tool |
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Today would have been great but The insurance isn't in yet. I'll let you know about my performance.
Noel Loveys, RPP, AME intern
Campbellton, Newfoundland,
Canada
Kitfox Mod III-A, 582, B box, Ivo IFA
Aerocet 1100s
noelloveys(at)yahoo.ca (noelloveys(at)yahoo.ca)
[quote]
--
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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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russ(at)rkiphoto.com
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| Posted: Mon Jun 11, 2007 5:25 am Post subject: Float performance tool |
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Peter
AFRAID I DON'T HAVE MUCH TO OFFER -- HAVE (sorry, hit caps) flown a
few floatplanes, owned a 170, old engine, Edo 2000's. Got about 16-18
sec run usually, one person aboard. Stuff like PBY's seem to take
forever. Beaver, Otter, Norseman I'd guess 20 sec or so but I didn't
take measurements.
A friend once designed and built, starting with a clean sheet of
paper! -- an ultralight biplane flying boat. Spoilers lower wing
only, Flew fine but he was afraid of it. New owner I think crashed it.
Have seen the Lotus single-float with Lee's retractable gear; not too
impressed.
I hope to get a Classic or Extra & make it amphibious, floating-hull.
Floats are too fragile for what I need to do with an aircraft. Don't
know how I'll handle the wing floats. Fold-down wingtips would be
great! -- but complicated.
Where are you located? Fresh water or salt?
Russ Kinne
do not archive
On Jun 9, 2007, at 5:28 PM, Peter C wrote:
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peterc(at)pipcom.com
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| Posted: Mon Jun 11, 2007 6:40 am Post subject: Float performance tool |
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Hello Russ.
The problem I have with floating hulls is the docking issue re the tip
floats. Docking a twin float plane is so much easier since almost any boat
dock will do. Unless you can always go into beaches docking in a stiff
breeze can be stressful.
Peter
My S7 on floats is still for sale.
---
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john(at)nielsenford.com
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| Posted: Fri Jun 15, 2007 2:22 pm Post subject: Float performance tool |
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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:
| Quote: | 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
|
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peterc(at)pipcom.com
Guest
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| Posted: Sat Jun 16, 2007 2:51 am Post subject: Float performance tool |
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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
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john(at)nielsenford.com
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| Posted: Sat Jun 16, 2007 5:46 am Post subject: Float performance tool |
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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:
[quote]
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
---
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|
| Description: |
|
Download |
| Filename: |
float_perf_worksheet.xls |
| Filesize: |
14 KB |
| Downloaded: |
390 Time(s) |
| Description: |
|
Download |
| Filename: |
Challenger_II_W&B.xls |
| Filesize: |
87 KB |
| Downloaded: |
405 Time(s) |
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