Twin Outboard Pursuit

[srislash]

Looks pretty good there Beniki.

[tlandauer]

Thanks for fixing the link, enjoyed your video, wish it was longer, love to see some full speed runs!

[kfxguy]

Nice! I like that boat!

[3-UP]

Looks good love the twin outboard sound get those ducks out of the way and opener up

[Beniki]

Cheers guys! I had to cut it short as I had an issue with one of my battery connectors desoldering. I am perplexed as it is a relatively low current setup and it is happening on the negative battery terminal.

It does get some decent speed, and sounds good! Only complaint I have is that there is quite a bit of torque roll. However, this will soon be rectified as RCBB have managed to commission a run of reverse rotation shafts for the TFL outboard leg.

[Beniki]

Here is a quick video showing the stability at SAW.

http://youtu.be/fuG10hxWBI0

Quite a bit of porpoising. Do you guys think it is best to play with the thrust angles or CoG first?

[Peter A]

You will need to adjust both is my thought, from watching the vid. Tweek and test until it runs sweet.

[Make-a-Wake]

Looks more like its "walking" side to side from what i can see....................

[siberianhusky]

Hard to really tell from the top two pictures, but it looks to me like the motors are mounted too low, props look like the shaft is below the keel line of the boat, also looks like they are pointed down a good bit. Once again it's a bit hard to really tell as the hull isn't really level with the table.

[Beniki]

Hard to really tell from the top two pictures, but it looks to me like the motors are mounted too low, props look like the shaft is below the keel line of the boat, also looks like they are pointed down a good bit. Once again it's a bit hard to really tell as the hull isn't really level with the table.

Believe it or not, but that is the maximum up angle the mount will allow. The centre of the props are perhaps 1mm below the keel line, but I think you are right. I may need to raise them to allow the hull to sit deeper in the water for stability. There is no sign of the props lifting out of the water during turns, so I have a bit of room to play with I think. I will try raising the mounts and report back.

[CWBETB]

Looks great neat project!

[Beniki]

Raised the legs ~3mm, which is the maximum I could do with the mounts.
As you can see it may perhaps still be too low. If this is the case, I may have made a mistake with the positions o the transom.
I will test it Tuesday. I hope it adds some stability.
With regards to the thrust angle, I may be able to machine the mount a little to allow the legs to be lifted to neutral.

[Beniki]

Another view

[Make-a-Wake]

You may be able to fashion a wedge type plate to go between the transom and the mounting area to give it more of an upward angle.

[Beniki]

Good idea. I wonder if I could get a piece of wedge shaped aluminium to save me trying to shape a piece