Dumas DeepVee20

[pribco]

Dumas20

Making progress-no real problems so far. Hopefully running gear will ariive today.

Since I am a glutten for punishment I just ordered the Deep Vee 40-just for fun.

Have pretty bad insomnia do most of my building in middle of the night.

[pribco]

deepvee20

Finally finished the Deepvee20. Put in survace drive -see pictures.

Tried it in pool today--disappointed as it just sort of plows along-

Am using standard Aquacraft 550 brushed motor which pushes my SkidaddleToo along pretty good.

After re-reading this thread I am wondering if I need the shaft to extend further from the stern and the problem is turbulance from the stern.- I tried to pattern this close to the setup of the Mini Rio but upon checking I see the prop on the Rio is set back further than I did on the Dumas.

DSCF1303.jpgDSCF1305.jpg

[FastVee]

Looks like the prop is way too close to transom and wrong angle.

try about 2" from transom and make the prop shaft level with the hull. flip the hull upside down, use straight angle on the bottom to the propshaft and make the shaft angle level with the hull line. that should be good place to start tuning it.

[pribco]

Crap--to do all you suggest I will need to buy a longer shaft, take out and redo the stuffing box and redo the motor mount-

What are your thouths of leaving the stuffing box on the present angle (it really isn't much), but just moving the prop back as you suggest. If I do that, however, it will leave about 1.5 inches of shaft beyond the stuffing box and I am concerned about wobble-

Should have stuck with a subsurvace like in the plans.

Hows the weather in Finlnd--in NJ it is about 90 def F, thunderstorms and humidity about 5000%--nasty--

[FastVee]

I forgot that your hull is small, so 2" is maybe a bit much. -try to get the prop a bit further from transom anyway, but even a smal amount could be enough to get it going.

If the angle is not too much, leave it like it is. It just looks a bit much in the pic.

You wanted to get nice speed out of it but not 60mph I guess so it could work with short stuffing tube also. -Try what is the easiest to try first and go from there! -was it flex or straight shaft? -just try half an inch more at first and try it, it could be good!

The weather is.... HOT! -about 30 deg. c and no wind. -and no air con.... -but atleast it is dry heat.

[pribco]

Following your advice of "keep it simple, stupid", I trimmed the stuffing box inside by a couple inches, enlarged the hole in one of the bulkheads to allow the coupler to fit through and have shoved the motormount backward, This gives me room to allow up to 2.5 inches to distance from stern to prop with easy adjustment for less.

Tested for shaft wobble and it looks good.

Motor mounts now drying--should be able to test tomorrow--will let you know.

[pribco]

FastVee- tried it out today--much better altough not as fast as my flat bottom ski boats--hull design on a wood deepvee requires a bit more power I guess.

In any case, thanks for the help--it really did work.

Bill

[FastVee]

Glad it works, but if you have only tested one prop etc.. -it could get faster if you find proper prop for it and get the drive angle correct. -it could run too wet now if the angle is too low.

Is that motor from the bristol bay ? -I think that is more of a low rpm motor for tug boats?

what batteries are you using? -6 cell nicads or 2s lipo? -I would try to get rpm´s closer to 20.000 if possible, fast electrics usually are about 30.000rpms and if that motor only turns about 10.000 that couldbe to blame here? -offcourse it depends what speed you are trying to get.

[pribco]

SupperVee- instead of mowing lawn today (never do today what you can put off until tomorrow- also wife is out of town for a few days) I took out and replaced the stuffing box so the isn't so much free shaft and changed the angle a bit. Now need to excercise some self control while the epoxy drys.

The motor I am using is definately not a tug boat motor--A while ago I tested it against the Dumas 10,000 rpm motor and it is twice as fast--as I said this motor works great in my 24" flat bottom boats with a subsurface drive.

Batteries-6 cell nicads--

Am not trying to keep up with you big dogs--I really think that tommow will work out great because of you help--the last time I did a test run I changed props and that also seemed to help.

[pribco]

Supervee-check this out-!!

http://youtu.be/CzrTC3qIQis

http://youtu.be/3RWTsneLSbg

[FastVee]

Am I promoted to supervee now ,
THe videos looked nice, any of the deepvee?

if that motor really turns about 20.000rpm´s and makes submerged driven boats fast, then on surface drive it should be faster. -but V and _ bottoms act differently offfcourse.

Any pics of the interior? -motor/battery location etc?

And what is the center of gravity on the deepvee? -close to 28% from transom?


oh, and I have wanted to build the deepvee 40 or 60 for few years, but never have done scratchbuilds b4, hopefully I can try building 1 next winter .


And it is fun to build slower boats also, really liked building this http://www.youtube.com/watch?v=VDd1L...eature=related

Pate

[pribco]

I started the deepvee 40 the other day--plans and instructions are really bad--Dumas should be made to sit in the "naughty corner" for a long time
-but they are workable with some thought--I enjoy the building in the wee hours of the morning when I can't sleep.

Some of the wood is really dry and brittle, but I can work with it. Give it a try--will keep you out of trouble during thos long winter nights.

Kind of embarrased to but up pics--my workmanship is not up to your standards--

[FastVee]

Dont worry, I have no standards , -I have never build anything other then cutting board of wood and I´m sure that my first few boat builds will look more like a table then a boat..

But the cog is something you could check, 27-30% from transom is where I aim the center of gravity usually on v-hulls

-any pics of the dvee 40 build?

[pribco]

stuff

Pics of skidaddles and deepvee build-also vid of WW2 landing craft I built from odds and ends-

http://youtu.be/bBPx4dWEMEQ