Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 03-03-2013, 15:35   #16
Registered User
 
stevensuf's Avatar

Join Date: Dec 2010
Location: Back in Scotland!
Boat: Gib sea 43
Posts: 840
Images: 10
Re: How Many have Tenders that Consume more Fuel than the Mother Ship?

the 9.8 tohatsu 2 stroke is only 26kg, so i can manhandle it on/off the dinghy when needed without a crane, the 4 stroke is much much heavier! and the 2 strokes are much more reliable
__________________

__________________
http://nicnsteve.blogspot.com/

If the pen is mightier than the sword, then my keyboard must be a nuclear missile!
stevensuf is offline   Reply With Quote
Old 03-03-2013, 16:14   #17
Registered User

Join Date: Jan 2012
Location: Sydney, Nova Scotia
Boat: Gemini 105mc
Posts: 24
Re: How Many have Tenders that Consume more Fuel than the Mother Ship?

I acknowledge that the op makes an interesting point. the efficiency of a dinghy with gas outboard is atrocious compared to a diesel in a sailboat. Slowing down your dinghy will help, but you still move a sailboat around at a whole lot less fuel per kg - mile. This points to the amazing optimization that is embedded in sailboat design, or conversely, the lack thereof in small outboard powered things.
__________________

__________________
DougM is offline   Reply With Quote
Old 03-03-2013, 16:42   #18
Registered User

Join Date: Jun 2007
Location: SW Florida
Boat: FP Belize, 43' - Dot Dun
Posts: 3,425
Re: How Many have Tenders that Consume more Fuel than the Mother Ship?

Not hard to figure out.

Displacement hull vs. planing hull
long wll vs short wll
helmsman knowing fast is not possible vs. operator desire to go fast

If you power your dinghy proportionally and operate proportionally, you'll get similar fuel economy.

Remember, diesel has 15% more BTUs than gasoline.
__________________
DotDun is offline   Reply With Quote
Old 03-03-2013, 18:07   #19
Registered User

Join Date: Dec 2009
Posts: 3,016
Images: 4
Liters per hour or miles per liter? You are not making a fair comparison if the dinghy is at planing speed.

But, yes, my dinghy fuel expense is about the same as my diesel expense. Mainly due to many more days at anchor than motoring thru lulls.
__________________
daddle is offline   Reply With Quote
Old 03-03-2013, 18:18   #20
Registered User
 
campuscab's Avatar

Join Date: Jan 2013
Location: Detroit
Boat: CAL 20
Posts: 111
What is funny is that most of you have tenders larger than my sailboat now i need to figure out what to do for a dingy. Maybe a inner tube and paddle. I am only 20 ft and will not pay more for a dingy than I did for the boat
__________________
campuscab is offline   Reply With Quote
Old 03-03-2013, 19:09   #21
Registered User
 
ElGatoGordo's Avatar

Join Date: Nov 2012
Location: Kemah, TX
Boat: Jim Michalak designed 25' Caprice and Self Design 32' Shantymaran
Posts: 711
Re: How Many have Tenders that Consume more Fuel than the Mother Ship?

Quote:
Originally Posted by stevensuf View Post
the 9.8 tohatsu 2 stroke is only 26kg, so i can manhandle it on/off the dinghy when needed without a crane, the 4 stroke is much much heavier! and the 2 strokes are much more reliable
I have no interest in debating your choices, I'm all for having what you want. But the reason I asked was just this sort of stuff that keeps coming up.

Based on

TOHATSU 9.9 HP 2-STROKE 9 HP

and

TOHATSU 9.9 HP 2-STROKE prices, specs, manuals and brochures.

AND

Tohatsu Outboard Motor 9.8hp 4-Stroke

Both our engines are the same weight. Now this confuses me because I thought the 4 stroke was heavier. As to "much more reliable" that's pure opinion, many 4 stroke guys will say just the opposite.

BUT...all that aside...you're basically complaining that your outboard is sucking gas when you CHOSE that outboard! Your choice...and I don't really care...but you ought to at least SAY you chose the less efficient engine.

I cruise slightly faster than your mothership on my 32' cat n/9.8hp 4 stroke Tohatsu for slightly less $/mile...that's really the bottom line.
__________________
------------------
Gordo
ElGatoGordo is offline   Reply With Quote
Old 03-03-2013, 19:24   #22
Registered User
 
LeaseOnLife's Avatar

Join Date: Apr 2008
Location: out cruising again
Boat: Sailboat
Posts: 1,046
Re: How Many have Tenders that Consume more Fuel than the Mother Ship?

Quote:
Originally Posted by ElGatoGordo View Post
I have no interest in debating your choices, I'm all for having what you want. But the reason I asked was just this sort of stuff that keeps coming up.

Based on

TOHATSU 9.9 HP 2-STROKE 9 HP

and

TOHATSU 9.9 HP 2-STROKE prices, specs, manuals and brochures.

AND

Tohatsu Outboard Motor 9.8hp 4-Stroke

Both our engines are the same weight. Now this confuses me because I thought the 4 stroke was heavier. As to "much more reliable" that's pure opinion, many 4 stroke guys will say just the opposite.

BUT...all that aside...you're basically complaining that your outboard is sucking gas when you CHOSE that outboard! Your choice...and I don't really care...but you ought to at least SAY you chose the less efficient engine.

I cruise slightly faster than your mothership on my 32' cat n/9.8hp 4 stroke Tohatsu for slightly less $/mile...that's really the bottom line.

you need to look at the old 8 or 9.8 HP 2 stroke (same engine, different jets in the carb). Nicnsteve has it right, 2 cycle, 2 cyl engine, 26 kg vs 37kg for the 9.8 4 stroke.

Regarding reliability, I go by: less parts = better

Edit: the 9.9HP you referenced, also was available as a 15 and a 18HP, same weight, this explaines the heavy weight, for a 2 stroke... see 2nd attachment
Attached Thumbnails
Click image for larger version

Name:	Tohatsu-old-2-stroke.png
Views:	45
Size:	143.3 KB
ID:	56118   Click image for larger version

Name:	Tohatsu-old-2-stroke-9.9.png
Views:	48
Size:	24.0 KB
ID:	56119  

__________________
LeaseOnLife is offline   Reply With Quote
Old 03-03-2013, 19:30   #23
Registered User
 
ElGatoGordo's Avatar

Join Date: Nov 2012
Location: Kemah, TX
Boat: Jim Michalak designed 25' Caprice and Self Design 32' Shantymaran
Posts: 711
Re: How Many have Tenders that Consume more Fuel than the Mother Ship?

That's what I thought, but both of those links are for new 9.9 2 strokes and both say different? idk

As I said, reliability is opinion. I have 6 outboards, only one 4 stroke. The only one that's not reliable is a 5 hp Mariner. But I love the fuel efficiency and quiet operation of my 4 stroke. But I'm not really concerned except that we compare apples to apples.

(edited to correct # of outboards, I forgot I sold 2)
__________________
------------------
Gordo
ElGatoGordo is offline   Reply With Quote
Old 03-03-2013, 19:31   #24
Registered User
 
ElGatoGordo's Avatar

Join Date: Nov 2012
Location: Kemah, TX
Boat: Jim Michalak designed 25' Caprice and Self Design 32' Shantymaran
Posts: 711
Re: How Many have Tenders that Consume more Fuel than the Mother Ship?

Oh I see what you're saying. You're looking at older models. The OP said new.
__________________
------------------
Gordo
ElGatoGordo is offline   Reply With Quote
Old 03-03-2013, 19:33   #25
Do… or do not
 
s/v Jedi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 9,198
Re: How Many have Tenders that Consume more Fuel than the Mother Ship?

The small 4-strokes don't work well with the dirty gas in the Caribbean. Always clogging up the carburator, nowhere to recycle the engine oil etc.
__________________
s/v Jedi is offline   Reply With Quote
Old 03-03-2013, 19:35   #26
CF Adviser
 
Bash's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: sausalito
Boat: 14 meter sloop
Posts: 7,260
Quote:
Originally Posted by barnakiel View Post
Slow down..
Slow down; get a four stroke.

This isn't rocket science. Four strokes sip where two strokes guzzle. All outboards become inefficient at wide open throttle. Chances are good that few of us would redline our diesels the way we redline our outboards.
__________________
cruising is entirely about showing up--in boat shoes.
Bash is offline   Reply With Quote
Old 03-03-2013, 19:42   #27
Do… or do not
 
s/v Jedi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 9,198
Re: How Many have Tenders that Consume more Fuel than the Mother Ship?

2-stroke:

- cleaner than 4-stroke
- less fuel consumption
- much stronger
- more reliable

__________________
s/v Jedi is offline   Reply With Quote
Old 03-03-2013, 20:30   #28
cat herder, extreme blacksheep
 
zeehag's Avatar

Cruisers Forum Supporter

Join Date: Jul 2008
Location: furycame alley , tropics, mexico for now
Boat: 1976 FORMOSA yankee clipper 41
Posts: 17,770
Images: 56
Send a message via Yahoo to zeehag Send a message via Skype™ to zeehag
Re: How Many have Tenders that Consume more Fuel than the Mother Ship?

i have a 4 hp 2 stroke johnson antique, but i row my 8 ft walker bay.
zeehag is offline   Reply With Quote
Old 03-03-2013, 21:44   #29
Resin Head
 
minaret's Avatar

Cruisers Forum Supporter

Join Date: Aug 2007
Location: Seattle WA
Boat: Nauticat
Posts: 7,199
Images: 52
Re: How Many have Tenders that Consume more Fuel than the Mother Ship?

I got a new Lehr, so I guess I should be concerned whether it uses more fuel than my propane rail BBQ or not.
__________________
minaret is offline   Reply With Quote
Old 03-03-2013, 22:08   #30
Registered User
 
ElGatoGordo's Avatar

Join Date: Nov 2012
Location: Kemah, TX
Boat: Jim Michalak designed 25' Caprice and Self Design 32' Shantymaran
Posts: 711
Quote:
Originally Posted by minaret
I got a new Lehr, so I guess I should be concerned whether it uses more fuel than my propane rail BBQ or not.
Nice ;-)
__________________

__________________
------------------
Gordo
ElGatoGordo is offline   Reply With Quote
Reply

Tags
fuel

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Diesel Fuel Tank " Sludge " Journey41 Construction, Maintenance & Refit 50 16-12-2012 08:42
Fuel Polishing System Cap Engines and Propulsion Systems 62 03-04-2012 06:15
Fuel polisher in Sail magazine Srah 1953 Engines and Propulsion Systems 10 22-12-2011 09:05
Challenge: How Much Extra Fuel and Water Do You Carry on Deck, or Below Decks ? Ocean Roads Challenges 8 10-11-2011 19:24
Do Not Use Biocide Journeyman Engines and Propulsion Systems 37 24-07-2011 19:47



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 01:30.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.