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Author Topic:   Challenger 25 GPS numbers
peteinsf posted 05-18-2004 03:17 AM ET (US)   Profile for peteinsf  
Tonight's numbers are...

Twin 200hp OMC, 1/4 tank, 16 pitch OMC SS-Prop, calm seas, 7kt cross wind, motor mounted too-low, taken in front of the ferry building..

3000rpm 22mph
3500rpm 26mph
4000rpm 33mph

I didn't dare go over 33 in the dark...


peteinsf posted 05-18-2004 03:51 AM ET (US)     Profile for peteinsf    

That 33 can't be right, it must have been 30.3 and I wrote it down wrong. I think 4000@33rpm would be negitive slip...


where2 posted 05-19-2004 05:41 PM ET (US)     Profile for where2  Send Email to where2     
Keep trying Pete. We can get 36mph with twin 115 Yamahas on the Whaler Drive on the back of the 25' Frontier. The extra 30hp should be offset by the additional drag on the boat with an extra lower unit in the water... (assuming the Whaler Drive doesn't drag much on plane)
peteinsf posted 05-19-2004 10:42 PM ET (US)     Profile for peteinsf    
Where2 Hmm, not good...

I am going to put the motors higher up on a 6" deep offset bracket, they are throwing a lot of spray at the moment.

Is 36mph the Frontier's top speed? Also, do you know the prop's pitch and gear ratio?

Thanks, I see I still have a bit of work ahead...


Chuck Tribolet posted 05-21-2004 10:28 AM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
Where2, Pete's boat has TWIN 200s. It should be faster than
your Frontier.


Chuck Tribolet posted 05-21-2004 10:30 AM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
Pete: you should confirm that your GPS is indeed setup to
read in MPH. Most marine GPSs default to knots, so your
boat would be a little faster than you think. It will be
burried down in the setup screens somewhere.


peteinsf posted 05-21-2004 11:07 AM ET (US)     Profile for peteinsf    

The Challenger tops out in the low 40's @5500, I just ran those GPS numbers on calm seas with no current etc. I didn't dare go any faster in the dark... My goal is to get the cruse speeds to be smoother. Right now the motors seem to bog down below 25mps. I am hoping by moving the motors up and getting the trim tabs working all will be better... 20-25 is the best SF bay speed.


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