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Conference vicki::boats

Title:Powerboats
Notice:Introductions 2 /Classifieds 3 / '97 Ski Season 1267
Moderator:KWLITY::SUTER
Created:Thu May 12 1988
Last Modified:Wed Jun 04 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1275
Total number of notes:18109

589.0. "Blowing out clogged pitots" by ULTRA::BURGESS (I don't DO big wakes) Tue Jan 16 1990 09:09

	I guess these things will always clog and while we might see 
something more reliable (electronic) sometime in the future, we're 
stuck with this problem for a little while at least.

	Here's a clearing device:-


	Speedo head	T-splice			pick-up

		========T=======================================
			|
			I <- check valve
			|
			|
			O <- bulb

Parts list:

	T-splice	auto parts store or pet/aquarium store.

	check valve	pet/aquarium store

	bulb		pharmacy;  as a replacement part for a pump up 
			style blood pressure machine, or maybe an 
			outboard tank hose bulb would do.

	for dual installations add another T between the bulb and the 
check valves

	Reg

T.RTitleUserPersonal
Name
DateLines
589.1Another place to spend $$$LEDDEV::GAUDETSki NautiqueTue Jan 16 1990 13:0013
    Oh my dear Reg, technology does provide an answer (unfortunately
    I just spent 20 minutes flipping thru my catalogs and I can't find
    it).  I remember seeing someone advertise a push-button version
    of what you described.  You install it on/under the dash, and it
    generates pressurized air in a small tank which is released at your
    command (pushing the button opens the tank valve).  Apparently it
    recovers the air pressure fairly quickly (must have a pump) so you
    can do it again in a matter of seconds.  The connections to the speedo
    lines are similar to what you described.  I vaguely remember it running
    around $130 for the dual speedo setup.  I'll have to check my mags
    tonight.
    
    ...Roger...
589.2Don't just throw money at it, get creative (-:ULTRA::BURGESSI don&#039;t DO big wakesTue Jan 16 1990 15:357
	Right, it ain't cheap - but I am.

	This is the ~$10 solution.

	R

589.3Not moving very fast.....ULTRA::BURGESSI don&#039;t DO big wakesWed Feb 07 1990 11:4014
	In .0 I said something about us being stuck with this type of 
speedometer for a while - until a  "better" technology.

	Since then I have been browsing through the catalogues and 
noticed that the latest batch of depth_sounders/fish_finders offer 
speed and surface temperature measurement as well (for about $35 
extra).  I was  ASS_U_ME_ING  that there was some extra smarts in 
these units, i.e. that speed was being measured relative to the 
bottom, or a nominally stationary object at a known depth.  Simple bit 
o' trig, right ?   Nope, they're using paddle wheel pick-ups.

	R

589.4Went back to my Air-guides...SETH::WHYNOTWed Feb 07 1990 11:564
    Hey Reg,
      Want to buy an electronic *tournament* speedometer cheap?
    It's REAL accurate 'cept it's 1mph off.  (includes paddlewheel)
    Doug
589.5Back-up tools; always carry a spare spare, etc.ULTRA::BURGESSMad man across the waterThu Oct 04 1990 14:1525
re .0	  ....it works pretty well, I've been using it since April.
Just having it has got me into the habit of giving the speedos a quick
blow-out every time I start the boat up and (usually, when I remember)
each time I take somebody through the ski course at a requested speed.
They did block one time at Willoughby this summer, it was so bad that 
I tore the starboard side pick-up apart.  There used to be a saw mill 
on this lake, up til the '50s I believe, and there is still a lot of 
fine wood dust that gets picked up.  Here's the back-up tool that I 
built while on vacation:

	___
	\_/	<---wine cork with 5/64 inch hole drilled in it


	 |	<---5/64 inch drill bit
	/_\	<---wine cork with 5/64 inch drill bit glued into it


	The top cork is used as a cap, the drill bit is greased to 
keep it from rusting.  I can use it from the swim platform while the 
boat is in the water and it doesn't matter if I  "drop it upwards" 
(-:, (-: 

	Reg

589.6Never had ice split the brass cylinders either (-:ULTRA::BURGESSMad Man across the waterMon Sep 09 1991 13:3022
re            <<< Note 589.0 by ULTRA::BURGESS "I don't DO big wakes" >>>
>                        -< Blowing out clogged pitots >-


	Hmmm, time for a progress report/update ?

	This contraption continues to work extremely WELL !  
With about 425 hours on the boat I did some timed runs through the
slalom course this week-end  - -  the net result is that because my
speedos have been  "blown out"  regularly, instead of being "twiddled
with"  they are spot on.  I sort of suspected they were, since a
certain footin' friend always requests 37 and never comments on the
speed being off in either direction (-: 

	Reg


PS & BTW   I got to pull Paul Tee through the course at 36 MPH, 22', 
28' and then 33' off  - -  I felt kinda silly when he offered to drive
me through, he even offered me a ride on his ski.  "Well Paul, if your
ski could do that for me...... I'd buy one just like it and have you
train it for me"