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Author Topic: So where do I add weight to trim her up?  (Read 5403 times)

NobbySideways

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So where do I add weight to trim her up?
« on: July 03, 2015, 10:47:27 pm »

Remembering I'm still a novice, some people on this forum have suggested I add weight to my Huntsman to get her to run more effectively in the water. Based on this short clip of her from the side, where would you suggest I do this? Should I use lead?


https://www.youtube.com/watch?v=WRIOp4WiHFA


Just out of interest here is a longer video of her running, I'm learning the controls a little better now. We clocked her at 18.5 MPH using an onboard GPS. Remember this is only the second time I've ever captained a model boat so I'm still pretty raw, but learning. I had been accused of speeding this video up but I promise I didn't.




https://www.youtube.com/watch?v=mb6SXUHjhdk



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sparkey

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Re: So where do I add weight to trim her up?
« Reply #1 on: July 04, 2015, 08:56:09 am »

 :-)) Yes the boat is too light,get some lead shot (about 2 kilo) from Flea bay cost about £10 with postage,start with 1 kilo in two plastic bags (I use cash bags ) place in centre of boat either side of keel and try boat on the water then you can move the weight around to get the results,add more weight if needed, once you are happy resin the shot in place to stop it moving around,this is the way I do it, some people use lead sheet and many other methods,best of luck with your boat looks a lovely model,Ray. :-))     
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inertia

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Re: So where do I add weight to trim her up?
« Reply #2 on: July 04, 2015, 09:47:41 am »

Jon
One of these placed just about anywhere should do the job    8)
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Tug-Kenny RIP

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Re: So where do I add weight to trim her up?
« Reply #3 on: July 04, 2015, 10:57:20 am »


It would show the film better if you turn the camera sideways

ken

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boatmadman

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Re: So where do I add weight to trim her up?
« Reply #4 on: July 04, 2015, 12:02:37 pm »

I think you need a bit of lead on the centre line and about one third length back from the bow.
This will reduce porpoises and help the boat run flatter on the plane.
I did this with mine and it runs just fine, but when stationary it is a little bow down..but hey..these boats aren't meant to be stationary!
Ian
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Jerry C

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Re: So where do I add weight to trim her up?
« Reply #5 on: July 04, 2015, 12:10:55 pm »

Can a planing hull be too light? What there was on film looked pretty good to me. As opposed to displacement hulls, 1st rule, move weight (battery) already on board. 2nd rule, add weight to set draught. 3rd rule, forget about 2nd rule. You may also consider trim tabs on the transom to reduce porpoising (which I didn't see on film).
Jerry.

NobbySideways

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Re: So where do I add weight to trim her up?
« Reply #6 on: July 04, 2015, 12:52:55 pm »

It would show the film better if you turn the camera sideways

ken

My girlfriend was on camera, I did keep reminding her but I didn't want to be too dictatorial as I was glad to have there there...

I didn't see any porpoising, it's pretty stable. Sometimes the torque would roll the boat on its side though.
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Perkasaman2

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Re: So where do I add weight to trim her up?
« Reply #7 on: July 04, 2015, 02:36:54 pm »

Add some weight a third from the bow as already mentioned by Ian, but also add some weight to each back corner to damp down the stern. There 's not a lot wrong with the boat looking at the video. A little bit of tweaking is all that's needed. Job's a good un.
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NobbySideways

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Re: So where do I add weight to trim her up?
« Reply #8 on: July 04, 2015, 03:01:50 pm »

Ok, thanks all. I've bought some lead shot.
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chas

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Re: So where do I add weight to trim her up?
« Reply #9 on: July 05, 2015, 12:14:03 am »

Why not try some trim tabs to alter the plane and correct the torque roll? Surely extra weight is best avoided.
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NobbySideways

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Re: So where do I add weight to trim her up?
« Reply #10 on: July 05, 2015, 09:27:14 am »

Why not try some trim tabs to alter the plane and correct the torque roll? Surely extra weight is best avoided.

Good point. I presume that's what the fast electrics add to the transom at the end of the chines?
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chas

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Re: So where do I add weight to trim her up?
« Reply #11 on: July 05, 2015, 06:39:50 pm »

Experiment with a wedge of wood stuck on with double sided tape. Make up  a few in diferent sizes to take to the lake. When you are happy with one, make a permanent job of it. Simples.
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