This project is a remedy for those who have destroyed numerous Medallion
Speedo Pickups. The design utilizes a stainless steel pickup (Gaffrig type) with
no kick up feature. The designs main purpose is to reuse the existing
Medallion hole pattern therefore eliminating any re-drilling. (We all like
that!). The pitot has been used on several "V" bottom, HydroStreams
and a Stoker. The results have been successful with no "optimistic"
gains made. All could claim the same reading as the OEM Medallion. Best of all
the pitots have worked well with no breakage…, maybe just some bending!
Although there is no kick up feature, the design does allow vertical adjustment,
which is a plus.
PLEASE NOTE: The drawings and DIY project are intended for
recreational and entertainment use only. This site and the designers of this
project assume no responsibility for misuse. The project is also not intended
for any commercial gain.
Materials
3/8" diameter stainless steel brake line
7/32" (or similar) stainless steel plate
7/16" I.D. stainless steel tube
¼" O.D. stainless steel brake line
For a source for SS tubing, check a McMaster Carr catalog. Their tubing
comes in diameters up to 1/2" and in 12" lengths: 304 is
$3.94/12" stick (any size) and 316 is $8.57/stick. They list a web
site at WWW.mcmaster.com.
Fasteners and fittings
2 - ¼ -20 x ½" SS hex head bolts
2- ¼ -20 SS hex head nuts
¼" Parker (or similar brand) compression fitting with barb on other
end for (typical) 1/8" ID tubing
Tools
¼-20 Tap and tool
Vise
Hack saw to cut SS
"Good" Pipe Bender
File
Assorted wrenches and screw drivers
Skills
Ability to weld stainless Steel
Tapping
(SS = Stainless Steel)
Instruction
Make tight 90° bend in 3/8" dia, brake line, cut to length as noted.
Note: some AE hulls and XT hull may require longer cut length, as these hulls
tend to lift higher out of the water especially with cleaver type props.
Weld about 1" length of 1/8" dia pipe onto non-bent end of
3/8" brake line.
Place lower portion (approx. 4") with bend into a vise and compress
until pitot is about 7/32" in thickness. (Put aside)
Sharpen leading edge of pitot opening.
Cut pitot base plate to size and pre-drill attachment holes for hull
mounting.
Cut pitot sleeve (7/32" ID pipe) to size.
Weld pitot sleeve to pitot base plate.
Drill and tap ¼-20 holes into pitot sleeve as noted
Fasten ¼-20 nuts onto ¼-20 bolts and thread into pitot sleeve.
Slide pitot tube into pitot sleeve and snug in place with ¼ -20 nut and
bolt assembly.
Attach compression fitting to top end of pitot.
Fasten to hull with existing Medallion screws and good Marine Silicone.
Attach Speedo line
Go have some FUN!
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| Pitot Base Dimensions. |
Pitot
Tube Dimensions. |
Pitot
Assembly: wireframe view. |
Pitot
Assembly:
rendered view. |
