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-   -   Hey Plane Silly (https://www.offshoreonly.com/forums/nordic/204998-hey-plane-silly.html)

Rage 07-29-2009 08:37 AM


Originally Posted by Nordicflame (Post 2920503)
Bill,
Is that a picture of your pickup?
That pickup is going to run pretty dry sitting above the notch :eek: There's no water there when running :(

Dave

No Dave, That is a picture of PlainSilly's transum that he posted on a different web site. It burned up a w/p impeller first time out. I'm just trying to brainstorm an unsolicited fix to make it work (extend it).

CB-BLR 07-29-2009 12:50 PM

1 Attachment(s)
I was going to comment on the placement of the pickup also.. It is not going to work there, even if lowered some. There is just not enough water there once on plane. It should be mounted something like this:

Chris

Plane Silly 07-29-2009 01:54 PM


Originally Posted by Rage (Post 2920091)
How far below the plain of the hull's botton running surface did you locate the water pickup opening? It does not look near deep enough from your picture. Maybe if you converted it to an adjustable water pickup like http://www.cpperformance.com/detail.aspx?ID=1160 or had someone modify your unit to make it adjustable you could adjust it deeper until you get sufficent water versus where you are at currently. You could cut off the current units down tube midway , OD sleeve the two pieces together with a split stainless tube and hose clamps, experiment with the pickup depth and when you find the correct depth have it all welded up permanent. Should be a lot cheaper than a drive conversion.

I did make it adjustable and it goes about 1 inch below the bottom of the boat. Still dry. I'm sure I can make it go lower but as stated above, I think it is pointless due to the pad and the location of my pickup.

Rage 07-29-2009 04:25 PM


Originally Posted by Plane Silly (Post 2920799)
I did make it adjustable and it goes about 1 inch below the bottom of the boat. Still dry. I'm sure I can make it go lower but as stated above, I think it is pointless due to the pad and the location of my pickup.

Just curious, when you say that you extended the p/u "1" below the bottom of the boat" is the bottom of the boat that you are refering to the horizontal edge bottom of the transum or the boat hulls 'V' bottom if extended out to the pickup from it's recesed position in front of the transum

Plane Silly 07-29-2009 08:53 PM

The bottom of the transum but to the starboard side of the pad.

Rage 07-29-2009 11:48 PM


Originally Posted by Plane Silly (Post 2921163)
The bottom of the transum but to the starboard side of the pad.

That, as you probably figured out, is the problem. The working end of the pickup needs to be ~ below the plain of the hulls V bottom that rides on the water in that location and not the bottom of the transum at that location which is of course above the plain of the boat's V bottom hull. The water surface as it exits the V bottom hull will not recover very much from that location when you are at speed. CB-BLR angled his p/u so that it avoids the transum offset entirely and it's working end is below the V bottom hull. If you extend your p/u enough it will pick up the water. A straight edge ruler flat on the V bottom hull parallel to the water flow to the p/u will give you a rough idea how much you would need to extend the p/u if that is what you want to do. Of course this all assumes that the notch ~midway forward in the Rage hull does not extend that far toward the hull's keel to be directly up stream of the p/u which if it is could aireate the water in front of the p/u and thereby reduce the p/u's water flow.

CB-BLR 07-30-2009 12:06 AM

That is not a picture of my boat... but a friends.
I just posted it to show where the pickup should be mounted. It is also not a good idea to mount the pickup near the keel, within the diameter of the prop, so as not to disturb water flow to the prop.

Chris

Rage 07-30-2009 12:15 AM


Originally Posted by CB-BLR (Post 2921274)
That is not a picture of my boat... but a friends.
I just posted it to show where the pickup should be mounted. It is also not a good idea to mount the pickup near the keel, within the diameter of the prop, so as not to disturb water flow to the prop.

Chris

DUH! I wondered about color difference in your avitar boat and this pic.

Rage 08-04-2009 03:02 PM


Originally Posted by Rage (Post 2921270)
That, as you probably figured out, is the problem. The working end of the pickup needs to be ~ below the plain of the hulls V bottom that rides on the water in that location and not the bottom of the transum at that location which is of course above the plain of the boat's V bottom hull. The water surface as it exits the V bottom hull will not recover very much from that location when you are at speed. CB-BLR angled his p/u so that it avoids the transum offset entirely and it's working end is below the V bottom hull. If you extend your p/u enough it will pick up the water. A straight edge ruler flat on the V bottom hull parallel to the water flow to the p/u will give you a rough idea how much you would need to extend the p/u if that is what you want to do. Of course this all assumes that the notch ~midway forward in the Rage hull does not extend that far toward the hull's keel to be directly up stream of the p/u which if it is could aireate the water in front of the p/u and thereby reduce the p/u's water flow.

Plane Silly?

Plane Silly 08-04-2009 09:37 PM

At this point I just have the transom up as high as it goes and plugged on the inside. Just going to leave it as it is through the drive for now. I may play with it some more at the later on.


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