[rebel-builders] RE: External Load Carrying - Canoe on RebelAmphi
Posted: Sun Feb 19, 2012 4:56 pm
De Remer also says that loads of plywood must be carefully tied together
(preferably nailed or screwed) so that they cannot separate vertically,
and create enormous drag in so doing. Somewhere else I read that the
turbulence off the blunt end, if flown blunt end aft, will cause
problems with the elevator or rudder. Its not pointy end forward that is
the problem. Its blunt end aft that is the problem. On water, since the
blunt end is not normally fully immersed as it is in air, such
turbulence is not a problem. :-D
Garry
Dave Ricker wrote:
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(preferably nailed or screwed) so that they cannot separate vertically,
and create enormous drag in so doing. Somewhere else I read that the
turbulence off the blunt end, if flown blunt end aft, will cause
problems with the elevator or rudder. Its not pointy end forward that is
the problem. Its blunt end aft that is the problem. On water, since the
blunt end is not normally fully immersed as it is in air, such
turbulence is not a problem. :-D
Garry
Dave Ricker wrote:
Now this is just for the sake of a chuckle but it's interesting to note that the
canoe in water doesn't travel blunt end first ;-P
And then there's the problem of a canoe with two pointy ends......
The canoe tied to the floats like that is an eye opener but my doctor told me a
story about building a cottage on a remote lake and flying all the lumber in on
the spreaders of his Supercub. He mentioned in particular flying loads of plywood
this way. I always pictured that a bit sketchy but I suppose that at the right
angle of attack it could provide some lift!
Dave
Garry wrote:
--In the book "Water Flying Concepts' by Dale De Remer on page 8-5 he
states 'Blunt ends of objects should be faced into the airflow, pointing
forward. In other words, a canoe with a transom for mounting a motor
must be attached with the transom facing forward.'
Wayne has already proved the workability of this method on the Rebel.
Thank-you Wayne. If anyone else wants to experiment with other methods,
looking into the written lore would be a good direction to start in.
Garry
bransom@dcsol.com wrote:
-----------------------------------------------------------------On 10/9/2008 2:52 PM, oifa@irishfield.on.ca wrote to rebel-builders:
I'm not sure I buy the comparison. The strut has smooth corners on the
front edge. The canoe has hard corners which would make turbulence and
eddies making a larger effective frontal area and drag. It's true there
would be eddies on the trailing side of a square corner thing too, but I
still think the eddies and drag would be less. I'd also guess the
stability would be better (yaw and pitch) with the pointy end at the front,
but heck, you've already found it to be a non issue.
Now this one, yeah, I'm with ya there!
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David A. Ricker
Fall River, Nova Scotia
Canada
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