Venturi

2 months 2 weeks ago - 2 months 2 weeks ago #33478 by matteo
Venturi was created by matteo
Hello I am fixing the Venturi, I need suggestions. Thank you in advance
It was an old Epic V10 style Venturi, a very slanting straight tube, similar to this one:


Now is just a hole:


Here the Venturi we are working to , molded on a PVC curve pipe:

 

It's going to be like this, not sure if it's a good shape:


Maybe is incorrect? It has to be like this instead?
 

And
which is the correct position respect to the hole?

Please Log in or Create an account to join the conversation.

2 months 2 weeks ago #33485 by Ranga
Replied by Ranga on topic Venturi
Why don't you just fit a bailer that can open and close. They are readily available to buy. And have ZERO drag when closed as opposed to 100% all the time with a venturi.

Please Log in or Create an account to join the conversation.

2 months 2 weeks ago - 2 months 2 weeks ago #33486 by matteo
Replied by matteo on topic Venturi
Hi Ranga thank you for your answer.
I didn't think about a bailer but now is
too late for change project , too much work has been done, today they will finish.


Please help me about position  and shape. I was't able to find coherent information on the web


I noticed that the cup in this old Uno 2009 is much shorter than the ones on sale today. longer is better?
[/size]
Attachments:

Please Log in or Create an account to join the conversation.

2 months 2 weeks ago #33488 by owenfromwales
Replied by owenfromwales on topic Venturi
Hi Matteo,
I guess it's a bit late now, but I would have just stuck bullet behind it, like I did on my V10. With the curve in the deck it was really easy. I used the conical plastic top from a silicon tube, trimmed the base and put some silicon inside it to make a rounded end and then siliconed it into the depression. It made a huge difference to the effectiveness of the venturi. I guess you can still go for a bullet though!

189cm 90~100kg
Present skis:
2017 Stellar SEI 2G
1993 Gaisford Spec Ski
1980s Pratt Spec Ski
1980s UK Surf Skis Ocean Razor
Previous
1980s UK Surf Skis Ocean Razor X 3
1987 Kevlar Chalupsky (Hummel) (Welsh copy!)
1988 Kevlar Double Chalupsky
1992 Hammerhead spec
2000 Fenn copy
Attachments:

Please Log in or Create an account to join the conversation.

2 months 2 weeks ago #33489 by matteo
Replied by matteo on topic Venturi
Thank you Owenfromwales, good idea to use silicon. It's not to late for a bullet, I will do it for sure later.
I had a leak in the internal pipe, which has been badly repaired twice, so the area to replace was quite large this time.
here you can see the first unbelievable repair:
Attachments:

Please Log in or Create an account to join the conversation.

2 months 2 weeks ago #33490 by owenfromwales
Replied by owenfromwales on topic Venturi
Wow!

189cm 90~100kg
Present skis:
2017 Stellar SEI 2G
1993 Gaisford Spec Ski
1980s Pratt Spec Ski
1980s UK Surf Skis Ocean Razor
Previous
1980s UK Surf Skis Ocean Razor X 3
1987 Kevlar Chalupsky (Hummel) (Welsh copy!)
1988 Kevlar Double Chalupsky
1992 Hammerhead spec
2000 Fenn copy

Please Log in or Create an account to join the conversation.

2 months 2 weeks ago - 2 months 2 weeks ago #33499 by matteo
Replied by matteo on topic Venturi
Ops! So many threads on the subject!  I apologize, better to search before posting.
Many interesting pages ,  This one  explained me a lot.


Attachments:

Please Log in or Create an account to join the conversation.

2 months 1 week ago #33512 by Newbflat
Replied by Newbflat on topic Venturi
The hole in the hull should be at the open end of the Venturi, touching the bullet. It will drain a lot faster than buried in the Venturi. Maximum suction is at the edge of the Venturi, not in the deep end. My swordfish S and an old Stellar SR both had the hole deep in the Venturi and didn’t bail worth a shit.  I moved both the Venturi and bullets so the hole was at the opening  and they bail twice as fast.  So definitely option #3... 

Bill


Stellar SR excel (gen2)
FENN Swordfish S carbon hybrid
Stellar SEL excel (gen 2)
Lot and lots of DK rudders.


Had:
Stellar S18s g1 (excel)
Epic V10 Double (performance)
Stellar SR (gen 1)
V10 sport (gen 2)
V10 (Gen 2)
Beater SEL (gen 1)
The following user(s) said Thank You: Scode, matteo

Please Log in or Create an account to join the conversation.

Latest Forum Topics

Protected by R Antispam