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Author Topic:   Montauk 170 - Planing Speeds
Jimm posted 07-19-2004 12:30 PM ET (US)   Profile for Jimm  
I was just reading another board (THT)and noticed a thread on planing and trim tabs. My Montauk 170 planes at 3000 RPM at about 20 mph. Is this about right compared to other 170s? I have a 90 HP 2 sroke with the OEM prop.
Matthew posted 07-19-2004 01:38 PM ET (US)     Profile for Matthew  Send Email to Matthew     
My results are consistent with those numbers.
Matt
fitn217 posted 07-19-2004 04:04 PM ET (US)     Profile for fitn217  Send Email to fitn217     
So are mine. I was hoping for lower rpm's and still be on plane, as this speed is a little fast when encountering heavy chop.
Maximus posted 07-19-2004 10:26 PM ET (US)     Profile for Maximus  Send Email to Maximus     
My exerience with the 90 4stroke is a 3100 RPM planning speed.
erik selis posted 07-20-2004 03:05 AM ET (US)     Profile for erik selis  Send Email to erik selis     
My numbers are the same as Jimm's.

Erik

Marsh posted 07-20-2004 08:44 PM ET (US)     Profile for Marsh  Send Email to Marsh     
I recently re-powered with a 115 EFI 4 stroke...now planing at approx 2500 rpm. Don't know the speed.

Later,
Marsh
2004 Montauk 170

BemidjiWhaler posted 07-21-2004 12:58 PM ET (US)     Profile for BemidjiWhaler  Send Email to BemidjiWhaler     
2003 Montauk 170 with a 90 Mercury 2-stroke. It planes at about 3000 rpm's with about 20 mph on the GPS. It cruises very nicely there, but the bow is a little high.

Dave

imko posted 07-26-2004 02:17 PM ET (US)     Profile for imko  Send Email to imko     
Montauk 2003 with 90 four stroke.
Prop: 13,75 x 19 Trophy Plus.(4-blade)
Planing at 2800 rpm , speed 21 mph.
JohnJ80 posted 07-26-2004 08:56 PM ET (US)     Profile for JohnJ80  Send Email to JohnJ80     
Adding tabs dropped my planing speed on my Dauntless from 20mph to about 15mph and the planing rpm by about 300-500 rpm. With tabs you will be able to go faster through chop because you can adjust the hull attitude to the chop and split it apart with the fine entry of the hull instead of the flat aft section.

J

WT posted 08-17-2004 09:13 PM ET (US)     Profile for WT  Send Email to WT     
My 2004 Montauk with the 90 HP 4 stroke planes at 3500 rpm. I was informed today by my dealer that 2004 models come with a different gearing thus the higher planing rpm.

The dealer also told me that I could install a Whale Tail which would get me on plane sooner.

Any thoughts?

WT

Moe posted 08-17-2004 09:48 PM ET (US)     Profile for Moe  Send Email to Moe     
The 90HP four-stroke on the 170s had 2.07:1 and a 16" prop when they first shipped. It wasn't long before the gear ratio got lower to 2.33:1, but the prop pitch went to 18", so RPM at a given speed was about the same.

If you have a 16" prop with 2.33:1 gearing, your RPM at planing would be higher (about 3375 vs 3000) compared to others.

--
Moe

Barney posted 08-18-2004 06:30 PM ET (US)     Profile for Barney  Send Email to Barney     
Moe makes a good point. I really don't understand the wide RPM reading differences people are reporting on the 4-Stroke. Jim
seasicknes posted 08-18-2004 08:25 PM ET (US)     Profile for seasicknes    
wt,
I go to the same dealer as you do. I installed a whale tail XL on my hydrasport 22 wa and it made a world of difference.

My just installed a stabilizer fin (The Edge) made by cobra marine. They come in various types of materials. I chose the stainless with black powder coating.

Will test out the fin on friday to see if he helps.

Ken

whalemate posted 08-18-2004 09:30 PM ET (US)     Profile for whalemate  Send Email to whalemate     
Planing speeds can now be checked against the factory test. This is for the 170 Montauk with all available listed moters, and all other new whalers on the Whaler.com website. Go to the model of choice, and than click on PERFORMANCE DATA. (upper right of screen). Each engine is examined along with other data. Fun to compare your own performance specs with those of Whalers. Hope that helps.

Chuck Stephens

AQUANUT posted 08-19-2004 09:57 AM ET (US)     Profile for AQUANUT  Send Email to AQUANUT     
I see a lot of response in reference to "minimun rpm while maintaining hydroplane"......currious as to how many different definitions from various posters on this condition of their boats...is it the point that your boat levels off and produces minimal wake...(I have my own opinion} just want to hear everyones elses...
thanks for input
AQUANUT OUT!

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