STV Euro 1/4 Mile ET

[woodduck]

Just wondering if anyone is dragging their Euro's at the moment, what et's they are getting and what terminal speed?
Mine ran between 93 and 97mph but the tacho went crazy, cannot give an accurate rpm but ran a 24ET with 1.87 gears! Had my foot into it!
Cracked my 15" cut mid from front to back on the passenger side! Hope it can be welded back up!
Will a 26ET give me a quicker ET or just a quicker terminal speed?
Fastest outboard on the day as usual, need more competition!
C'mon all you fast Aussie boat drivers, lets line em up!

[Instigator]

Just wondering if anyone is dragging their Euro's at the moment, what et's they are getting and what terminal speed?
Mine ran between 93 and 97mph but the tacho went crazy, cannot give an accurate rpm but ran a 24ET with 1.87 gears! Had my foot into it!
Cracked my 15" cut mid from front to back on the passenger side! Hope it can be welded back up!
Will a 26ET give me a quicker ET or just a quicker terminal speed?
Fastest outboard on the day as usual, need more competition!
C'mon all you fast Aussie boat drivers, lets line em up!

I was told that to be competetive in our Lake Racer class of ODBA over here that you needed to turn a 24" 9200 - 9400 and about that speed if I remember correctly.
Keep the 24. Your guess on the 26 is correct.
You'll give up too much hole shot with the bigger prop and then not have the track left to run them down.
Gary

[woodduck]

Now I have to realy pull my finger out, got the 260 from Missouri 18 months ago, have never pulled the plugs so I guess I should crack it since I have to take it off to fix the mid! They race bracket/mph classes down here and I hate backing off! Mostly inboards! On the side, like the big OMC post Gary, still got my 97 OMC and the Evolution Marine intake, gotta do something with that!

[Casey]

most odba and dsra lake racer boats run 24's or 22's with 2 to 1's or 1.87's with a 22 and turn between 10,000 and 10.700 at speeds in the upper 90's to low 100's. top times range from low 12's to high 11's

[euro scott]

i was wondering if you re-drilled the transom to accomidate the 15 inch mid or if it was built for it?

[woodduck]

No, Used the existing holes from when I had the OMC on with a L&S Hydraulic plate. Took the hydraulic plate off and machined an Allison Jack plate to clear the steering and it just fitted! Don't have a lot of out trim but only need that for the trailer or beach anyway!
Can someone do the rpm calculation, allowing for slip, at 97mph with the 1.87 gears, what where my revs? That was with an allison cut 24ET prop!

Have they changed the way you add photo's?

[Juggernaut]

<CENTER><FORM method=post><TABLE border=4><TBODY><TR><TD>
Engine
RPM
</TD><TD>
Gear
Ratio
</TD><TD>
Propeller
Pitch
</TD><TD width=20> </TD><TD>
Propeller
Slip
</TD><TD>
Speed
MPH
</TD></TR><TR><TD><CENTER><INPUT onchange=computeField(this) size=5 value=8868 name=engrpm></CENTER></TD><TD><CENTER><INPUT onchange=computeField(this) size=3 value=1.87 name=gratio></CENTER></TD><TD><CENTER><INPUT onchange=computeField(this) size=4 value=24 name=pitch></CENTER></TD><TD width=20> </TD><TD><CENTER><INPUT onchange=computeField(this) size=2 value=0.1 name=propslip></CENTER></TD><TD><CENTER><INPUT onchange=computeField(this) size=3 value=97 name=speed></CENTER></TD></TR><TR><TD align=middle colSpan=6><INPUT onclick=computeForm(this.form) type=button value=Compute> <INPUT onclick=clearForm(this.form) type=reset value="Clear Fields"></TD></TR></FORM></TBODY></TABLE></FORM></CENTER>calculating engine rpm using 10% prop slip, you get 8868 rpms.
http://www.rbbi.com/folders/prop/propcalc.htm

[woodduck]

Thanks Juggernaut, I will use that link! Jeez, I knew I was ringing its neck, I will be pulling the powerhead down before I use it next!
Next Question, who makes a good looking reliable trim indicator that is not gonna cost a fortune?

[Juggernaut]

well, there aren't really any bad companies. just shop around for what style you like.