a canard JAE build

[darryl whitman]

Hi guys , what do you guys think of an JAE canard boat, Im going to start revamping a JAE rigger into the canard.
as I do so I will post Pics , an if anyone could or see some thing that may help me , Plz chime in ..
the guys here in Iowa gave me the idea, but I think someone may have tried this , don't know , but here going my build.

[T.S.Davis]

KRJoye built a couple canards back in the the early 2000's. Not the best "race" boats but they're pretty cool none the less. Back then we had almost no real power to weight ratio available. Who knows now with the crazy power possibilities.

Might be a fun adventure.

[Fluid]

I ran a few in the late 1990s, but as Terry said power was very low. There was a commercial one designed after the Miss Elam for 1/16th scale FE racing in the APBA. Running 7 round cells it was about 21" long.

Aeromarine, Hydro&Marine and a few other firms have sold them for gas and nitro. Few nitro canards have done well, but Ed Fischer designed several which were world-beaters. Canards are tricky to set up but if the design is right they run well and are fun to watch. Here are some more recent threads.

http://forums.offshoreelectrics.com/...ghlight=canard

http://forums.offshoreelectrics.com/...ghlight=canard

http://forums.offshoreelectrics.com/...ghlight=canard


Ed Fischer canard:



.

[grsboats]

The Stilleto from Dagger Boats was a good one to race with in the 90's.

[785boats]

Well you've got my interest mate.
I've often thought of trying a rigger canard without the rear wing covered in. Just the spars.
Which way are you intending to try it.
Here's my latest escapade with a canard.
http://forums.offshoreelectrics.com/...rd-Hydro/page2

[Fluid]

Ken Joye built a "riggerized" canard a decade ago. The traditional canards are designed to have some aero lift aft of the CG, the aero to lighten the sponsons on the water. This means that the CG is pretty far back making component placement tough. The front sponson is supposed to float above the water on the straights like a catamaran, then plant the bow for turning. The good ones turned exceptionally well, better than riggers did....but that was before modern turn hydro fins were adopted.

I encourage the OP to try it, canards prefer to be a bit overpowered and with today's power it could be great.

Ken's canard

[darryl whitman]

guys thanks for the support, Im really hiped up on this . here is what I have done so farS7301176.jpg
I cut off the sky, then drew lines from front to back , inline with the boom holes , then cut off what I think I dont need from the sponsons,
I wiil make a template to drill new holes for the booms,

I think the motor mounts may need to move to the back some , from the stock placement ,??
also what r your feeling , guys about electric VS, nitro on this prototype build??

[darryl whitman]

785boats I saw the videos of the canard , you said - it did not have a turn fin ?? also if you would , plz tell me on your boat the CG an how long the boat is plz ,

[T.S.Davis]

Wow. That's an old pic of Ken. Sharp Park in Lansing. Michigan Cup 2 maybe.

When we were all scrambling to make sense of brushless, Ken tried a small out runner motor in that on 12 sub C. That wasn't the only canard he built.

[Fluid]

...I think the motor mounts may need to move to the back some , from the stock placement ,?? also what r your feeling , guys about electric VS, nitro on this prototype build??

You will want the CG considerably back from the rigger version, the weight will be supported by the rear sponsons. Not sure cutting them off was a good idea though. Packs in the back, electronics up front. A strut with a long bracket putting the prop back aways from the transom will help keep the driveline bends sane with the motor back. What motor etc. will you use? Your plans for the front step are....?

Odd 2nd question to ask on an FE site...electric of course!


.

[T.S.Davis]

hahaha Ni trolls? Blaspheme.

[785boats]

785boats I saw the videos of the canard , you said - it did not have a turn fin ?? also if you would , plz tell me on your boat the CG an how long the boat is plz ,

Darryl.
That boat is 950mm long (37"). The COG is at 26%. Or 250mm (10") from the transom. That's about 3/4" in front of the Penrite sign in the pic below. That allows the front shoe to just breathe on the water with as little contact as possible, as you can see in the videos. It does seem to get a bit of a bounce sometimes & I think that's because as the speed builds the wing starts to lift the boat off the water starting up a bit of an oscillation. But that shouldn't be a problem with just spars.
Maybe the cog could be a bit further forward as you won't have the lift of the wing. I don't know.

No there's no turn fin on this one. The ride surface of the inside starboard sponson is 10mm deeper than the port sponson. That is enough to hook the sponson in the turns.
You might consider building a ride pad on the starboard sponson about maybe 6 or 7 mm.
I'm going to retrofit a thicker ride pad of about 12mm to that canard in my avatar to see if I can remove the turn fin. One day.
I've also added a pic so you can see the difference in height of the sponsons & you might also get a bit of an idea on a front shoe.