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trv 16 and the laws of hull speed

R

revlimiter776

Member
I have had a 74 trv 16 for about five years now, and i have had many different engine configurations and setup's. The bottom line you may ask? 48 mph is about the best i can get it to go, it ran 51 mph with a 140 looper evinrude mounted on the transom two holes up, and a 19" pitch prop, the highrer i brought the engine the same speed, many propelers, jack plates ect, the boat 42 gps with an evinrude 70 hp triple on the transom and 46 with a merc 90 on a jackplate turning a 19, 21, 17 the boat will not break it's hull speed no matter how light i make it. the hull is completely gutted. The only way to make this thing move is going to be a 225 hp or addition of a pad on the hull, the boat is a pre pad boat and just lay's in the water like a barge, but it's wide stable and versatile. The law's of hull's ?, if you want to go fast you need a fast hull.
 
trv

i am going to add a pad to the hull, this week, i bet i pick up 15 to 20 mph. Horsepower always helps but if you can go faster while retaining lightness and fuel economy it definately pays, I was going to pickup a glassstream (hydrostream mold)? or a sportier hull, but i like the trv and hope to add warp speed without making it too dangerous. i'll send some pics of my test strip
 
sorry but i dont think you will gain any speed at all with the addition of a pad. you may go slower with the extra weight. you simply do not have enough power to get the boat out of the water. a pad will be well below the water at the speeds you are running.
 
The first Check I ever drove was a TRV17 with a 150 Inline on it.

It would run in the high fifties all day long.

And that was before the days of jackplates and setback and such.
 
trv 16 barge

What method of speed verification was used on your trv 17? i have an 84 115 propshaft rated merc tower which is comparable to your old 150 tower, and i couldn't get much more out of the boat, i have plenty of props and tried the motor at many different heights, the best it did for me was 51 gps with a 140 evinrude on the transom, no jackplate, or setback, i scrapped the pad idea and left the boat running rather than laid up for the season,
 
It wasn't my TRV.

It belonged to a friend.

Speed verification was via the speedo and the hairs on the back of my neck.

It was 1983 so no GPS! :D

Have you tried running your set up through one of the speed and pitch calculators to see what it comes up with?
 
speed

yes i have run through the prop calculator's and have a garmin gpsmap 76s, water speedo in on the money at 40, i have had comparable sized hydrostreams with similar power and been in the sixty's but they just aren't as good all around as this little trv, the original ad as found on this website lists the boat at 750 pounds i believe and i have removed the entire interior, i think the boat needs the motor in the water more to help lift it up, i'm going to drop it all the way down tommorrow morning to see what i get
 
My friends TRV was not the 16'.

It was bigger.

I think it was the 17'. As I remember it was rated for a 150 and it had a 150 on it.

To me just using common sense something seems wrong with your performance numbers. You should be able to do better. Quite a bit better.

As an example, my 170 Pulse with a XR4 runs 60ish with no plate and a high five prop. And that's GPS verified.

And my Pulse tips the scales at about 1300 Plus Pounds.

The TRV's were lighter according to the old catalogues I have. The old brochure says that the 1974 TRV 16 tips the scales around 740 LBS.

So I would guess....

Either the boat is heavier. Is the flotation foam wet perhaps if it has it?

Or, you are down on power from what you think you have...

Or perhaps your boat is runnning really wet and you need to air it out.
 
Dropping your motor down more will not increase speed it will kill it. I wouldn't be surprised if your boat is a few hundred pounds heavier with trapped water that would definitly not let it air out.
 
I was just re-reading the thread and I'm a bit confused now.

Are you saying you're running 40ish with the 140?

If you're running low 50's with the 140, that's probably not too bad.

There might be a few more MPH's to squeeze out if that's the case, but I would think you're not too far off where you should be.

If you say you're running 40ish with the 140 than something is definitely up.
 
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