H&M Intruder twin build

[tlandauer]

Got a bit more done:DSCN7276.jpg DSCN7293.jpg DSCN7294.jpgDSCN7296.jpg

[tlandauer]

Question on rudder distance

I wanted to use the TFL rudder, but on this particular hull, there is no "build-in" rudder platform that extends from the back of the tramsom, please take a look and tell me if i need to fabricate a extender and how far? I thought off set rudder's leading edge should be roughly where the drive dog is. Is it the same for cat hull's center rudder as well?
Also, I want to have dual cooling, the TFL dual pick up rudder is a lot bigger, would that be a problem? The small sponson rear pad makes sponson pick up a difficult proposition, what do you guys think?
DSCN7302.jpg DSCN7306.jpg DSCN7305.jpg
Third picture is of single water pick up rudder.
Thanks!

[royalcasa]

Trying to see how the stuffing tube should be bent.[ATTACH=CONFIG]126070[/ATTACH] [ATTACH=CONFIG]126071[/ATTACH][ATTACH=CONFIG]126072[/ATTACH]
Although I will be using .150 cable, for alignment purpose, I use a 3/16" aluminum rod to line up the motor, I plan to use teflon liner as well, but I prefer to have a solid rod for this step.
Moving to the real thing:[ATTACH=CONFIG]126073[/ATTACH] [ATTACH=CONFIG]126074[/ATTACH]

What did you use to bend the tube.
This is looking very nice. you are not as slow as you claim to be. lol I am much slower.:)

[tlandauer]

Thanks!
I have a discarded .187 cable, and I slip over this cable a teflon liner that is meant for a .150 cable. It is hard to slide it on, but most bend is no longer than 4", so all I did was have the liner on the .187 cable for about 4".
This only works for 1/4" tubes, BTW, since this tube can be used for .150 with liner and .187 w/o liner, my contraption is serving me well, all you need to do is insert the cable+liner and start bending away.
Some people put sugar in the tube and seal both ends, I haven't tried yet, but in any case I prefer not to heat up the brass tube in the process.

[srislash]

L

I wanted to use the TFL rudder, but on this particular hull, there is no "build-in" rudder platform that extends from the back of the tramsom, please take a look and tell me if i need to fabricate a extender and how far? I thought off set rudder's leading edge should be roughly where the drive dog is. Is it the same for cat hull's center rudder as well?
Also, I want to have dual cooling, the TFL dual pick up rudder is a lot bigger, would that be a problem? The small sponson rear pad makes sponson pick up a difficult proposition, what do you guys think?
[ATTACH=CONFIG]126143[/ATTACH] [ATTACH=CONFIG]126145[/ATTACH] [ATTACH=CONFIG]126144[/ATTACH]
Third picture is of single water pick up rudder.
Thanks!

Tim, the rudder depth in pic one looks good(approximately) but in pic two that looks deep and with those pickups at the bottom cutting that sucker is out. Can you mount the rudder up higher on that transom/cowl? You can do your servo rod mounting under the rudder arms. Progress is going well buddy. It wasn't so long ago that a drill and Dremal were about all I had, I had my hand tools too but found a hammer not so good for boat building.

[tlandauer]

Thanks! HAPPY NEW YEAR!
What about the distance from the transom, you have a few twins I remember and those fantastic videos! what is the conventional wisdom on that.
I agree with the rudder depth, guess i will settle for this one and see if I can put transom pick up.

Sent from my D6708 using Tapatalk

[srislash]

I have been putting the leading edge of the rudder is even with the leading edge of the props.

That being said, my R-42 shall have all kinds of rudder adjustments via the Speedmaster standoffs and struts because I am curious how things handle with the rudder in front of the props.

[RandyatBBY]

What did you use to bend the tube.
This is looking very nice. you are not as slow as you claim to be. lol I am much slower.:)

That is a good way to get it correct. I have done that a lot over the years when I wanted to get it right.

[tlandauer]

Slow progress: I wanted to see how the rudder would look if mounted a bit further than the pictures in post #17 had shown. Using 2.5mm CF plate I Dremel'ed these bits by hand .
DSCN7308.jpgDSCN7311.jpg DSCN7314.jpg DSCN7323.jpg
Here is how it looks like on the hull:

[tlandauer]

DSCN7338.jpg DSCN7337.jpg DSCN7332.jpg
Here is a side view:DSCN7328.jpg What do you guys think? Should I run it like that or leave the rudder stock? It was more of a "looks" issue to me than actual concern for turning ability.
Also the rear overhang from the transom is extremely low, not much vertical room to mount hard ware, I hope I can mount the servo standing up and use pull-push rods:DSCN7340.jpg
I can always bend the rods and mount the servo horns below the servo arm. More fiddling, but I am back to full schedule work.

I have also toyed with the idea that with a side laying servo, using just one rod, and leaving the other " idle" for symmetrical look.
Any inputs would be greatly welcome.

[royalcasa]

Thanks!
I have a discarded .187 cable, and I slip over this cable a teflon liner that is meant for a .150 cable. It is hard to slide it on, but most bend is no longer than 4", so all I did was have the liner on the .187 cable for about 4".
This only works for 1/4" tubes, BTW, since this tube can be used for .150 with liner and .187 w/o liner, my contraption is serving me well, all you need to do is insert the cable+liner and start bending away.
Some people put sugar in the tube and seal both ends, I haven't tried yet, but in any case I prefer not to heat up the brass tube in the process.

got it, I take it that the inserted cable prevents the tube from kinking and you get the clean curves.
Thanks,

[srislash]

Tim, you should be able to put the bends in the rods to suit whatever. Just make sure they are on 45degrees or less to avoid deflection. Or you could run cables, lol.
I like the standoff, pretty slick.

[tlandauer]

Tim, you should be able to put the bends in the rods to suit whatever. Just make sure they are on 45degrees or less to avoid deflection. Or you could run cables, lol.
I like the standoff, pretty slick.

Got it, and thanks!

[Fella1340]

The build is looking great, you should give your building skills more credit. I like the standoff to, double servo arms would look the best.

[tlandauer]

The build is looking great, you should give your building skills more credit. I like the standoff to, double servo arms would look the best.

Thank you very much!
I like to be modest, that way I am more willing and open to learn and accept my mistakes as well.