lead and foam question Revell GATO

[He Who Shall Not Be Named]

Hey. You got your priorities straight. Good man.

David

[beeryboats]

More floation tests in the pool tonight. It was not my sub though. I found it impossible to keep my 9 year old daughter out of the pool. The sub is still in the hobby room.....

Jay

[trout]

Merriman ribs on the barbie!

[He Who Shall Not Be Named]

You People!....

.... I buy you books; I send you to school, and you idiots eat the Teacher!

David

[Reckless]

I thought I made it clear in the tutorial: work out submerged trim first. Then, once submerged trim is worked out, all you have to do to achieve correct waterline in surface trim is to move foam above/below the waterline.

David

wait.... we were supposed to read/pay attention to those ?....

[trout]

Jay,
It is good to see you back in the posting saddle again! I learn from you still!
Peace,
Tom

[beeryboats]

Well, like a true packrat, I printed the tutorial but did not staple it in order. So here I am with three pages not knowing which one goes first. So I figured I would start at the bottom and work my way up! So to speak. Just wanted to know if that was correct.

It is kind of funny that you build something that you think is perfectly symetrical side to side, and yet it will always favor one side when it flips over. I build a lot of balsa RC aircraft, and no matter how you try to use equal weight balsa, you always end up with one wing much heavier than the other.

Jay

[He Who Shall Not Be Named]

I thought I made it clear in the tutorial: work out submerged trim first. Then, once submerged trim is worked out, all you have to do to achieve correct waterline in surface trim is to move foam above/below the waterline.

David

[trout]

Jay,
I trimmed submerged first.
Peace,
Tom

[beeryboats]

Ok, I'll give her a try. Maybe I'm doing this backwards? Should I get the surfaced trim set first before worrying about submerged trim?
Jay

[He Who Shall Not Be Named]

Not yet, but you've sure got me thinking outside the box. If I've got the boat somewhat trimmed submerged, but listing on the surface, I should take some of the foam from below the waterline to above the waterline on the light or uphill side of the boat. That way it will only effect surface trim and not submerged trim? Or am I overthinking the whole thing? I think the heat was getting to me.....
Jay

No, to correct the list you need to move foam that is immersed in surface trim -- try to swap sides with foam just below the surface trim waterline.

Hang in there -- once trimmed, you'll never have to do this awful thing again!

David

[alad61]

G'day Jay. I know how you feel. I've had mine in the tub getting the trim right for more hours than it has seen open (& deep) water and when you think you have it right... well... my only advice for what it's worth is only add foam above the waterline as an absolute last resort. For mine I started from the middle and worked forward & aft after the initial lay of lead and foam. One thing I found really helpfull was getting the SD to float level when the ballast was empty & full. The full part was a bit tricky but patient persistance got me there. As it will for you too.

[trout]

Jay,
i think he means move some of the foam at the water line to the other side at the water line. The side that is dipping will need more foam. Or add more weight and the foam to counter it on the side that dips.

[beeryboats]

Since the lead is way down in the center, it makes no sense moving it. The foam, on the other hand, glued to the port and starboard sides of the hull, exert more moment. So, if you want to change the list (correct the list) move some of the foam from one side to the other.

You hating my living guts yet?


David

Not yet, but you've sure got me thinking outside the box. If I've got the boat somewhat trimmed submerged, but listing on the surface, I should take some of the foam from below the waterline to above the waterline on the light or uphill side of the boat. That way it will only effect surface trim and not submerged trim? Or am I overthinking the whole thing? I think the heat was getting to me.....
Jay

[He Who Shall Not Be Named]

Since the lead is way down in the center, it makes no sense moving it. The foam, on the other hand, glued to the port and starboard sides of the hull, exert more moment. So, if you want to change the list (correct the list) move some of the foam from one side to the other.

You hating my living guts yet?


David