Chunky venturi covers

2 weeks 4 days ago#30284by Canadasurfskiguy
I've been thinking lately and I'm not sure if my thoughts are of the silly hair splitting nature or are of some worth.

I've got an elite sl. It has two venturis, each cover has a chunky lip where it's glued on to the boat and is also quite big. Their much bigger than the venturi cover on my old v10L and I think their bigger than Think boats' venturi's too. I figure this must create a decent amount more resistance than boats with 1 slim cover and definitely more than all the new bailer boats.

I was down for the Gorge race last summer and saw a newer elite S that had much slimmer and streamlined venturi covers. Do you think there's a worthwhile speed benefit to bother trying to sources these slimmer covers, figure out how to get my current ones off and epoxy on the new ones?

Has anybody done much gps time-trialing to tease out the differences between two -venturis, one venturi or a flush bailer?

Thanks!

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

2 weeks 3 days ago - 2 weeks 3 days ago#30292by nell
My guess is that you won't notice any speed difference between larger and smaller venturi covers because it would be too small to measure. However, I suspect that smaller covers (and bullets) will lower resistance in such a way that you'll save a little bit of energy over an hour or more of paddling. I suspect that the same would be true for closeable bailers vs venturis.

I recently converted my McGregor Classic from two small venturis to a bailer. The ski feels slicker and it's obviously quieter at speed, but I can't tell any speed difference on gps.

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

2 weeks 3 days ago#30302by Fuyang Guy
My thinking is that the gains would be so small as to not make it worth open boat surgery. Unless you are skilled and like to tinker.

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

2 weeks 3 days ago#30308by Dicko
I have a bailer on my SEL and there is a noticeable difference in dragwhen the bailer is fully open. I would say around 0.2 kph. It doesn't sound much but after an hour of paddling 200 meters is a long way back. When the bailer is open it also improves the stability slightly. The nose doesn't get knocked around as much.

If you are worried about the drag from the venturi hoods you could add bullets to the venturis'. Red 7 invented the bullet to reduce the drag from the hood and allow them to use 3 venturis with little impact on flat water speed.

Somewhere on this site there was an article on the effects of bullets on drag.

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

Latest Forum Topics

Internal Bouyancy of Surfskis

1 hour 25 minutes ago

Leashes with clips

2 hours 17 minutes ago
Protected by R Antispam