MRP Python Canard.

[domwilson]

I am thinking about starting to build this thing. It is 31" long with a 18 1/2" beam.
Originally supposed to run on a 3.5 outboard. But I think I want to make it an inboard on brushless power. Thinking of a 9XL on 4s1p. On a canard, where is the COG supposed to be? Turn fin location? Any suggestions?

[Diegoboy]

That thing is SWEET! It reminds me of a...
Klingon Bird of Prey!

[boater76]

Thats what I was just going to say before I scrolled down Diego. LOL.

Ken

[Meniscus]

Dom,

Check out this thread: http://forums.offshoreelectrics.com/...ead.php?t=6598

I tried to compile many of the Canard pictures out there in one location. Also, you can see those folks who have them and run them for additional input.

Hope this helps.

[lomdel]

You can turn it around and run it backwards with the prop-shaft through the nose, then it will behave like a real rigger/hydro should with forward side sponsons and a small rear ride pad... lol!

[domwilson]

Dom,

Check out this thread: http://forums.offshoreelectrics.com/...ead.php?t=6598

I tried to compile many of the Canard pictures out there in one location. Also, you can see those folks who have them and run them for additional input.

Hope this helps.

Thanks Ben,

I don't know how I missed that thread. From what I've been reading, Canards are almost as fast as riggers but handle better. Problem is that they are harder to setup.
Doesn't appear to be a whole lot of info. on these. I guess I'm going ot have to spend some more time on research.

[domwilson]

That thing is SWEET! It reminds me of a...
Klingon Bird of Prey!

Yep. I thought It looked like a Klingon Vorcha class attack cruiser....

How did I know this?

[domwilson]

Bump...Any info. or suggestions?

[Simon.O.]

Given that I designed and built a Canard I may be able to help.
I run mine with the front sponson just kissing the water and the rear is very light too. I have a lot of lift as it was originally built for brushed power and Ni cells.
At 40mph it is fine, above that and it gets very interesting very fast.

I have scribbled on one of your photos to indicate where I think you should start with your Cg and prop placement.
My prop is well aft of the sponson rears and this seems to work.

I'm keen to help you and Paul (785boats) will too.

[domwilson]

Thanks. I think I'm going to be a little short on the hardware. I'm going to be using Aeromarine hardware that was designed for a BJ26. Trying to keep the cost low by using what I've got. http://www.aeromarinerc.com/index.ph...mart&Itemid=53

The rudder length should be fine. The COG you recommended, I will go with that.
Where would a turn fin go? Thanks for your help. Any other info. would be helpful also.

[Simon.O.]

Thanks. I think I'm going to be a little short on the hardware. I'm going to be using Aeromarine hardware that was designed for a BJ26. Trying to keep the cost low by using what I've got. http://www.aeromarinerc.com/index.ph...mart&Itemid=53

The rudder length should be fine. The COG you recommended, I will go with that.
Where would a turn fin go? Thanks for your help. Any other info. would be helpful also.

Turn fin ????
Not needed at all !!

Try to get the prop out as far as you would on a Cat. 10% minimum
Rudder off set to either side, I have mine on the right as I turn right most of the time.
Set out your gear so that you can move the Cg or add ballast if you have too.
Expect it to run nose heavy for a while and then you can move Cg back and lighten the nose up.

The 9xl you have suggested is fine if propped well.
I treat the canard the same as a hydro as far as power and props go.
When I give mine the rigger prop it is fun. and then then

[domwilson]

On my builds, I usually lay a dowel or angled wood under the hull. And lay out the components with batts to get the right COG. What size is yours? What prop are you using?

[domwilson]

I've been reading that these are in between a rigger and a 3 point hydro. Believe it or not, I even got a instruction manual for this with alot of other misc. parts. But it references a 3.5 cc nitro outboard for the setup.

[Simon.O.]

I've been reading that these are in between a rigger and a 3 point hydro.

To me a rigger is a 3 pointer, just wider at the front, a Canard is more like a Cat to setup properly.

Believe it or not, I even got a instruction manual for this with alot of other misc. parts. But it references a 3.5 cc nitro outboard for the setup.

There may be some very useful info in that set of instructions, please do not lose them. I am keen on a scanned copy if you can do that.

What size is yours? What prop are you using?

I just ran a quick set of measurements.
Bow to rear of hull is 26"
It is 12 1/2"wide overall.
Front sponson TE to rear sponson TE is 19"
The prop is 3 1/2"aft of the the rear TE and a little above the sponson TE line

Prop is 432 for fun and the 632 for madness.
I run a 540-8S 4400kv on 2S for 40+ mph

[785boats]

What a great looking canard. I for one will certainly be looking forward to the final product on the water. There will be pics & videos won't there?
The COG is best at the COL (center of lift) & where Simon indicated it is exactly where I would estimate it to be. Is it "Great minds think alike" or "Fools never differ"
Of course it all depends on what effect those little canard wings at the front & the upturns on the rear of the sponsons have. But as with all boats that's a thing for testing & dialing in.
I'm surprised that the instructions don't mention the COG somewhere as it is pretty important with these things.
All the best.
Paul.