Joysway seadrifter driving me flipping nuts

[flipper]

Hi all,

I am hoping you guys can point me in the direction of some trimming tips that can save my rescue boat some work. I have a Joysway Seadrifter and the problem is it doesn't like to stay in/on the water, it enjoys a good flip, and seldom lands right side up.

I have attached some pics of the boat and a video of it on top form.

Please try and resist suggestions like, get a bigger boat, calmer lake, etc. cos I wont be beaten/can't. Although if physics insists what can you do !

SV200953.jpgSV200955.jpgSV200956.jpgSV200957.jpgSV200958.jpg

[flipper]

Final pic of the offenders bottom

SV200959.jpg

[Stinger9D9]

I'm by no means an expert, but I'd try lowering the depth of the strut. That should raise the transom of the boat a bit - and lower the front - so not as much air gets under the hull.

[Peregrine]

It doesn't look like it is blowing over, it looks to me like it is a torque spin. Is it happening under acceleration? Looks like it needs more side to side stability. So, maybe the strut lower will be a good start place, if not, how about trim tabs?

[flipper]

It happens equally when turning and when flat out, and not as often, when accelerating, despite my videos evidence. Edit... On second thoughts it maybe is related to changes of throttle, I would have to wait till my next outing to be sure, but re-watching the video I can see how it would bring that conclusion.

Apologies for the newbieness, the strut being part of the bracket that adjusts the ride height of the prop ? Assuming yes, do I always keep the thrust angle of the prop parallel to the large flat section of the hull (the part between what I would call the side rails) ?

Trim tabs, no problem, try the strut 1st though ? Then tabs for lateral stability ? Assuming it is torque do I just put one trim tab on ?

[Rumdog]

No trim tabs on a hydro. You are correct on the strut. Lower it a bit. If still a no go give the prop a little negative thrust. Meaning you want it thrusting downward a degree or two. You'll also want a turn fin on that boat. It mounts on the rear of the starboard sponson.

[flipper]

Negative thrust giving the effect of lifting the rear, sinking the front ?

Can do a turn fin to, is putting it on the right a standard ? (I guess for a clockwise, right hand turn course). I'm just messing about with it so it gets left and right turns just as frequently. Does the weakened ability to turn left outweigh a turn fins stability advantages ?

[Rumdog]

No way. You'll be VERY pleased with the ability to rip a wide oper hairpin turn to the right. It will prob. help straight line stability as well.

Neg. thrust will help keep the sponsons planted a bit. Where is your CG?

[flipper]

A fin like this one ?

http://www.ebay.co.uk/itm/TURN-FINS-SMALL-rc-model-boat-turnfin-nitro-electric-/150540753493?pt=UK_ToysGames_RadioControlled_JN&hash=item230ced9a55

With a bend in it like mentioned here ? Or just set at an angle ?

http://www.fastelectrics.net/hydroplanes.php#turn_fin_shapes

COG pic attached, measured with the top deck on, photographed with it off. Battery as far forward as it goes.

SV200963.jpg

[Rumdog]

Those are mono fins. You need one like this: http://www.offshoreelectrics.com/pro...od=dh-aqub9515

[flipper]

I thought as much, being in the UK we don't have as many sources. Just wondered if they would be passable. I shall search more.

EDIT, this sort o thing http://www.astecmodels.co.uk/catalog...roducts_id=745

[Rumdog]

OSE sells to the U.K. Right?

[flipper]

No doubt, should of explained myself, didn't want to wait for the Airmail :)

[Stinger9D9]

Here's the reason you don't want trim tabs. If the boat is running properly, the transom (rear of the boat) will not even be touching the water. The prop lifts the rear end and the centerline of the prop runs on the surface.

DSC_0041.jpg

[flipper]

Turn fin ordered, will adjust the strut on next outing to and report back. Thanks for all the help.

Cam.