89 mid cabin performance

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mrrudely
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Posts: 191
Joined: Sat Jun 08, 2019 11:52 am
Location: Marina Del Rey, CA

89 mid cabin performance

Post by mrrudely »

hey guys
I recently pulled out the Trojan manual that's kept on the boat
and saw a performance page
however it seems it has nothing to do with reality
I am not seeing the mid cabin numbers listed but it does have the express listed
and the sedan and aft cabin combined listed separately

numbers are as follows:

@2500rpm 17mph 21gph (express)
13mph 21gph (sedan and aft cabin)
@2400rpm 12mph 20.1gph (my average)

@3000rpm 23mph 26gph (express)
19mph 26gph (sedan and aft cabin)
@3000rpm 16mph 37gph (my average)

@4000rpm 35mph 52gph (express)
32mph 52gph (sedan and aft cabin)
@4000rpm 23mph 48gph (my average)

I have 454's with carburetors and HEI distributors all running well
W.O.T. is about 4200rpm

thanks for any feedback
rr
10 meter mid cabin
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prowlersfish
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Re: 89 mid cabin performance

Post by prowlersfish »

I was trying to find my specs on the mid cabin with no luck yet. Do to the set up on the mid-cabin I would expect to to be a bet slower than the express. shaft angle and smaller props maybe a factor. Trojan specs were optimistic. ( like everyone elses) And test were done under perfict conditions and fuel burn was calculated using engine manufactures spes. With that said your seems a tad slow. 4200rpm at wide opens is great.

Things to look at prop condition, having them scanned and tuned to class A can do wonders.
Bottom condition?

4200 rpm at wot is where your what to be, Is props size at stock or slightly less? Or are the way less?

The amount of gear on board?






/
Boating is good for the soul
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat :D
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RWS
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Joined: Sat Feb 18, 2006 7:01 am
Location: West Coast Florida
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Re: 89 mid cabin performance

Post by RWS »

It's all about weight

think about the options:
  • generator
    microwave
    2nd anchor
    chain rode
    all that furniture/wetbar/icemaker in the cockpit
    spares
    tools
and any other options not listed equates to a whole lotta weight

They likely tested these boats with one skinny guy and a coast guard kit !

BEST !

RWS
By the way, here's my new to me boat:
IMG_4498.JPG
IMG_4498.JPG (88.91 KiB) Viewed 2593 times
1983 10 Meter SOLD after 21 years of adventures
Yanmar diesels
Solid Glass Hull
Woodless Stringers
Full Hull Liner
Survived Andrew Cat 5,Eye of Charley Cat 4, & Irma Cat 2
Trojan International Website: http://trojanboat.com/

WEBSITE & SITELOCK TOTALLY SELF FUNDED
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BobCT
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Joined: Mon Sep 07, 2009 9:01 pm
Location: New Haven CT

Re: 89 mid cabin performance

Post by BobCT »

Harris, that new boat looks great!

For the mid cabin, I have years of video showing fuel burn/speed at different RPM's (both 454's and now my 8.1's). I posted that before, let me see if I can dig it up. Yes, 4,200 is ideal, 4,000 is probably close enough. The thing with the mid cabin is once you get over 3,500 it's a whole lot more fuel and very little payback in speed and the flo scans just max out. I really only pay attention to fuel burn at cruise and above so I don't have much at lower RPM's. I have my Garmin set to knots.

Looking at your data below, 16 MPH is 18.4k and that's damn good at 3,000 RPM's. At 4,000, 26k+ is about right as well. With my 454's, I was happy at 17k burning 32GPH. Maybe your fuel burn is a touch higher but I think you are right in the ballpark.


@3000rpm 23mph 26gph (express)
19mph 26gph (sedan and aft cabin)
@3000rpm 16mph 37gph (my average)

@4000rpm 35mph 52gph (express)
32mph 52gph (sedan and aft cabin)
@4000rpm 23mph 48gph (my average)

Bob
1988 10m mid cabin
mrrudely
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Posts: 191
Joined: Sat Jun 08, 2019 11:52 am
Location: Marina Del Rey, CA

Re: 89 mid cabin performance

Post by mrrudely »

thanks guys
not sure if I feel better or worse
I'll just have to live with it
rws-
awesome!
I'm jealous
what model is it?

rr
10 meter mid cabin
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RWS
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Joined: Sat Feb 18, 2006 7:01 am
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Re: 89 mid cabin performance

Post by RWS »

Was very difficult for me to do this, especially after sneering at this brand for years.

Boy oh boy, did I get an education on these boats

this is a 1996 450 Sundancer running CAT 3126 - 420 horse diesels

posting some info and data - whups - can't attach a pdf

KNOTS - NOT MPH - THIS IS MY ACTUAL DATA

.90 NMPG @ 23.6 kts - WOW

then throttle back to 17 kts and the NMPG goes up to 1.10 NMPG

apologies for the hijack

RWS
1983 10 Meter SOLD after 21 years of adventures
Yanmar diesels
Solid Glass Hull
Woodless Stringers
Full Hull Liner
Survived Andrew Cat 5,Eye of Charley Cat 4, & Irma Cat 2
Trojan International Website: http://trojanboat.com/

WEBSITE & SITELOCK TOTALLY SELF FUNDED
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