Simon's Canard.

[nauti-tucu]

Hi:
Simon.O., any vids?... please!!!!!!!.., Iwant to see this canard IN ACTION

[NorthernBoater]

Are there any free software packages that I can use to open the cad files?

[ED66677]

Voloview from Autodesk or Edrawing from Solidworks, both are free.

[Simon.O.]

Hi:
Simon.O., any vids?... please!!!!!!!.., Iwant to see this canard IN ACTION

No vids of anything yet. Pics are hard enough to get.
This is on the shelf with all my small boats at the moment while I sort out motor replacements.
Wen i get it ready again I will be trialing a longer strut standoff to get the prop further aft to see if this will improve the tracking of the boat.

[Meniscus]

OK, I'm catching up on this thread. Do we have an explanation of "perturbation" in the following quote from Ed?

"I would not go for fins on the front step, because they would face the prop and generate perturbation inducing prop efficiency loss!"

[nauti-tucu]

Hi:

No vids of anything yet. Pics are hard enough to get.

OK...

[Simon.O.]

OK, I'm catching up on this thread. Do we have an explanation of "perturbation" in the following quote from Ed?

"I would not go for fins on the front step, because they would face the prop and generate perturbation inducing prop efficiency loss!"

http://en.wiktionary.org/wiki/perturbation

Given that he is French, I would surmise that he has used this word to descibe the turbulance that would appear aft of a fin that is placed on the rear of the front step.
Google + Wiki~~~ = knowledge

In any case the fin there did not produce any undesirable handling charateristics, it did help a little in high speed turns.
At present there are no fins anywhere on the hull but that may change.
There is always change with this one.
In comparison, a rigger is a doddle to setup.

[ED66677]

I would not go for fins on the front step, because they would face the prop and generate perturbation inducing prop efficiency loss!

having something in the water, other than prop and rudder will of course generate drag, but IMO also create non linear flow of water in front of the prop.
I have quiet a lot of experience with RC Plane and I'm making a parallel here, on a plane if you have two wing, on right in front of the other, the rear one is in the perturbation of the front one, the front one being in a so called laminar flow of air, the rear one being in a non laminar flow, as another example, before the exponential exists on modern Tx, on a glider or sailplane, if one wants to have exponential he only needed to have a poor response or efficiency of the mobile surface (aileron, rudder, elevator) around neutral (evantually non symetrical witch is the diferencial) we used to put a piece of adhesive tape (the thicker gives less reponse around neutral) on the fixed surface just in front of the mobile part, this is deteriorating the laminar flow, this is still used on real sailplane to create differencial or/and expo!
Back to our bnon flying model, when the boat moves, the water witch is located after a fin or a rudder is not laminar anymore, due to its pass around the fin or rudder, the same is visible if the water pickup is right in front the prop... efficiency loss!
IMHO, an appropriate V shape on front and rear sponson would do the same job as fins... with less drag!

[Dr. Jet]

........this is still used on real sailplane to create differencial or/and expo!

Actually, this is done with "zig-zag" tape to reduce drag (by controlling where the laminar flow separation bubble occurs) and increase the effectiveness of the control surface.

[peells]

That word is a mouth full (Science Geek language or an engineer) no offence intended

[Simon.O.]

The handling issue that I earlier described as a shimmy is now resolved.
I suspected for a while that it was caused by slop in the rudder linkage and then the steering servo itself. The slop was sorted and the servo has now been replaced, it was too big anyway.
The major problem was the noise from the Br motor that was in there causing major RFI and giving the steering servo a fright.
I now have a small BL motor and most of the handling errors are resolved. The range is now unbelieveable.
It goes like a greased weasel.

I am now saving the coins for a bigger BL motor + esc and that will be here before xmas.

[ED66677]

Good!

[Dr. Jet]

The handling issue that I earlier described as a shimmy is now resolved.
I suspected for a while that it was caused by slop in the rudder linkage and then the steering servo itself. The slop was sorted and the servo has now been replaced, it was too big anyway.
The major problem was the noise from the Br motor that was in there causing major RFI and giving the steering servo a fright.
I now have a small BL motor and most of the handling errors are resolved. The range is now unbelieveable.
It goes like a greased weasel.

Good to know Simon. Based on your success with this, I'm thinking the 400 mm, laser-cut wood canard kit will most definately be the next project after I finish the BBY hull.

[peells]

so lets see that greased weasel (video) from Simon O.

[ED66677]

Vids! vids! we want some vids!