F/V Venom

[Bill]

bad ass...........

 

[Estimator]

If it had wings it would fly

 

[F/V First Team]

It does fly, even without wings

Fun day Searsport Harbor getting that shot

 

[restless]

what hull is that? It looks hard chined. Interesting.

 

[F/V First Team]

Muscle Ridge *Wayne Beal* 28 with 300hp SisuDiesel and a 2-speed ZF gear 2:1/1.5:1

Not hard chined, just dual rails back then.

 

[Tuna Hooker]

Wait, what? A 2 speed tranny? Whats that about? Whats the speed on that bad ass little rig?

 

[BOSBoatMan]

Boat needs trim tabs the size of barn doors to keep that nose down

 

[offshore31]

nice, looks like the old hemi-under glass.

 

[F/V First Team]

Wait, what? A 2 speed tranny? Whats that about? Whats the speed on that bad ass little rig?

She has a two speed gear box, goes from 2:1 to 1.5:1 with the flick of a switch

Boat needs trim tabs the size of barn doors to keep that nose down

We got rid of those double rails and that brought her down to a more manageable angle of attack. Originally she had an Isotta Fraschini in her, huge V8 pumping out 1000+

 

[captchuck]

She has a two speed gear box, goes from 2:1 to 1.5:1 with the flick of a switch



We got rid of those double rails and that brought her down to a more manageable angle of attack. Originally she had an Isotta Fraschini in her, huge V8 pumping out 1000+

Travis can you expand on the two speed tranny? We're there any real benefits to it etc or was it a one time thing? Never heard of one before in a Downeast style hull.

 

[Keelboater]

Back in the early '60's they were using powerglides in Chris Craft Sea Skiffs. But I think this must be a bit more refined and high tech than those days.

 

[F/V First Team]

Travis can you expand on the two speed tranny? We're there any real benefits to it etc or was it a one time thing? Never heard of one before in a Downeast style hull.

So here we have a regular gearbox

 

[F/V First Team]

And here is a 2 speed, see the extra transmission bolted to the back?

 

[F/V First Team]

The whole idea behind a two-speed gearbox is to get large vessels up onto plane quicker and easier on the engine, then once on plane you can shift to your other gear so you can bring the engine rpm down and keep your vessel up on plane. So how would this work in a downeast boat? Well let's take a lobster boat configuration into consideration, when you're loaded down and freighted with traps and gear you would be in your work load ratio (2:1 for example) so your engine wouldn't have to work as hard to move that load. Then once you have everything off you shift into your running mode (1.5:1 for example) and off you go.

There are 3 boats that I can readily name that have 2 speeds, most people don't consider them. They are fantastic off the line. Brutal, just brutal.

0 to 40 in under six seconds.

Fact.

 

[Splinters]

So from a fuel economy stand point this sounds promising. Is this possible with ZF transmissions or is it Twin Disc?

 

[F/V First Team]

ZF is the only ones making 2 speeds

 

[WoundUpMarine]

How's that sudden torque change on the shaft? Does it need to be oversized much?

 

[F/V First Team]

You prop the boat for your least amount of reduction, in this case 1.5:1

Comes out of the hole screaming in 2:1 since there's no load on the engine, flip the switch past the peak of the torque and keep it going now what the turbo is up to speed and can supply the engine.

Handles it real good, didn't like it so much when the 22x35 was on it, seemed to bog down a little at 1.5:1

 

[F/V First Team]

Shaft is 1.75" just like Easy Money since that was the propeller we had on her way back when.

 

[Toro]

Travis, If you were doing another tuna boat like Emme, would you do Tricel honeycomb for the cockpit? Or 3/4" medium density PVC ?
I used that in my skiff and seems hard to imagine anything stronger, lighter, more durable. Is that question a wash, 50/50?