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Author Topic:   Twin Outboards

tonyp68 posted 05-16-2009 01:34 PM ET (US)
Do twin outboards double the horsepower?
Tom W Clark posted 05-16-2009 02:19 PM ET (US)
Trick question?
TransAm posted 05-16-2009 02:51 PM ET (US)
They double the pleasure with Double-mint gum
tedious posted 05-16-2009 03:03 PM ET (US)
Depends on the size of the horse.
Plotman posted 05-16-2009 03:45 PM ET (US)
I think you are trying to ask if twins - say a pair of 125s produce the same effective HP as a single 250.
For all practical purposes, yes.
You might loose a little at the top end because of the drag of a second gearcase. But then again, because you have two props that have a larger blade area than the single, you have a much better hole shot, and better towing ability.
I happen to have owned two different Outrage 22s - one with a single, and one with twins.
Plotman posted 05-16-2009 03:46 PM ET (US)
I think you are trying to ask if twins - say a pair of 125s produce the same effective HP as a single 250.
For all practical purposes, yes.
You might loose a little at the top end because of the drag of a second gearcase. But then again, because you have two props that have a larger blade area than the single, you have a much better hole shot, and better towing ability.
I happen to have owned two different Outrage 22s - one with a single, and one with twins.
R T M posted 05-16-2009 08:25 PM ET (US)
Here is a fact. Back in the day, my 24` Aqua Sport with twin 115 Merc. tower of powers, would easily outrun my friends 23` Mako with a single 225 Johnson. These were mid eighties motors. But maybe that's not a fair comparison.
rich/Binkie
Kingsteven18 posted 05-16-2009 08:53 PM ET (US)
Ask octomom.
tonyp68 posted 05-17-2009 01:27 AM ET (US)
We had an argument going and a shipwright tried to tell me that no matter how many engines you can't exceed the horsepower output of the largest hp engine. i wasn't buying it, but I thought that i would put the question out there just in case. Thank you plotman for your input.
TransAm posted 05-17-2009 09:23 AM ET (US)
Tell the shipwright I will allow him a classic 25' hull and a 300 HP engine, and we can race. Me with my twin 250's, him with a single 300...winner take all.
pglein posted 05-18-2009 02:53 PM ET (US)
This "shipwright" doesn't seem to know the difference between horsepower and speed. I think what he's trying to say is that you can't go any FASTER than the fastest propeller can safely spin. That is, if you have two 150 hp engines, one with 17p prop, and one with a 19p prop, the boat would not actually push it any faster than the 19p prop was capable of pushing it. Theoretically, there may be a grain of truth behind his logic; but in reality, I wouldn't put money on it.
L H G posted 05-18-2009 04:33 PM ET (US)
I think twin outbards are a total waste of money. We all know a big single is more economical to buy and run. But on a boat designed to handle twins, a single looks like a big slug. Twins have a "coolness" factor in overall appearnace of the rig, safety and performance that's actually worth something.
So remember you only go around once, and your kid's, ex-wife or widow will spend it you don't, so, if you can afford it, why not have something while you're here that you enjoy and that gives you recreational pleasure.
http://smg.photobucket.com/albums/v429/lgoltz/Outrage%2025/?action=view& current=MVI_0147.flv
Jessielove posted 05-18-2009 06:32 PM ET (US)
As the man said... coolness factor.
DeeVee posted 05-18-2009 10:19 PM ET (US)
I have never owned a boat with twin outboards, and may never in my life- but I would love to have a boat rigged with twins.
I agree with the "coolness factor" opinion.
Doug
Hilinercc posted 05-19-2009 11:31 AM ET (US)
I once served as a Chief Engineer on a corporate motor yacht (115' Benetti) We had 2 Whaler tenders, one was a Montauk with a well worn 90hp V-4 Johnson, and the other was a 19' Outrage with twin 70hp 3 cyl. Evinrudes.
Both boats were fun to drive, but the Outrage with the twin 70's was a total blast. Those dual 70's singing on the stern when tached up was beyond cool.
The first mate and myself raced these two boats once, and we discovered (not surprisingly) that the Montauk had a slight edge in top end speed (it gradually inched forward of the Outrage) but it was no smack down.
The owner of the yacht used the Montauk as a "chase boat" for his jet skis, while the Outrage was the "water taxi".
I found myself using the Outrage a whole lot more than the Montauk, simply because the twin 70's were a joy to run, and who ever sees twins on a 19' these days?
TransAm posted 05-19-2009 11:41 AM ET (US)
When you are miles from port, and it is a very humid 95 degrees, stagnant and with no wind, and you blow a powerhead, it is very "cool" when you can make way and create a significant breeze in your journey home on the 2nd motor.
Fishcop posted 05-19-2009 12:35 PM ET (US)
Holly Crap Larry! Are those new motors? They sure sound sweeeet! I sold my 25' when the fuel prices went up, but looking at yours, I may get another ;-)
Andy
L H G posted 05-20-2009 12:31 AM ET (US)
Andy those are 1997 200 EFI's, with a lot of hours on them. They just run and run and run, no service needs at all, except for the routine stuff.

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Author	Topic: Twin Outboards
tonyp68	posted 05-16-2009 01:34 PM ET (US) Do twin outboards double the horsepower?
Tom W Clark	posted 05-16-2009 02:19 PM ET (US) Trick question?
TransAm	posted 05-16-2009 02:51 PM ET (US) They double the pleasure with Double-mint gum
tedious	posted 05-16-2009 03:03 PM ET (US) Depends on the size of the horse.
Plotman	posted 05-16-2009 03:45 PM ET (US) I think you are trying to ask if twins - say a pair of 125s produce the same effective HP as a single 250. For all practical purposes, yes. You might loose a little at the top end because of the drag of a second gearcase. But then again, because you have two props that have a larger blade area than the single, you have a much better hole shot, and better towing ability. I happen to have owned two different Outrage 22s - one with a single, and one with twins.
Plotman	posted 05-16-2009 03:46 PM ET (US) I think you are trying to ask if twins - say a pair of 125s produce the same effective HP as a single 250. For all practical purposes, yes. You might loose a little at the top end because of the drag of a second gearcase. But then again, because you have two props that have a larger blade area than the single, you have a much better hole shot, and better towing ability. I happen to have owned two different Outrage 22s - one with a single, and one with twins.
R T M	posted 05-16-2009 08:25 PM ET (US) Here is a fact. Back in the day, my 24` Aqua Sport with twin 115 Merc. tower of powers, would easily outrun my friends 23` Mako with a single 225 Johnson. These were mid eighties motors. But maybe that's not a fair comparison. rich/Binkie
Kingsteven18	posted 05-16-2009 08:53 PM ET (US) Ask octomom.
tonyp68	posted 05-17-2009 01:27 AM ET (US) We had an argument going and a shipwright tried to tell me that no matter how many engines you can't exceed the horsepower output of the largest hp engine. i wasn't buying it, but I thought that i would put the question out there just in case. Thank you plotman for your input.
TransAm	posted 05-17-2009 09:23 AM ET (US) Tell the shipwright I will allow him a classic 25' hull and a 300 HP engine, and we can race. Me with my twin 250's, him with a single 300...winner take all.
pglein	posted 05-18-2009 02:53 PM ET (US) This "shipwright" doesn't seem to know the difference between horsepower and speed. I think what he's trying to say is that you can't go any FASTER than the fastest propeller can safely spin. That is, if you have two 150 hp engines, one with 17p prop, and one with a 19p prop, the boat would not actually push it any faster than the 19p prop was capable of pushing it. Theoretically, there may be a grain of truth behind his logic; but in reality, I wouldn't put money on it.
L H G	posted 05-18-2009 04:33 PM ET (US) I think twin outbards are a total waste of money. We all know a big single is more economical to buy and run. But on a boat designed to handle twins, a single looks like a big slug. Twins have a "coolness" factor in overall appearnace of the rig, safety and performance that's actually worth something. So remember you only go around once, and your kid's, ex-wife or widow will spend it you don't, so, if you can afford it, why not have something while you're here that you enjoy and that gives you recreational pleasure. http://smg.photobucket.com/albums/v429/lgoltz/Outrage%2025/?action=view& current=MVI_0147.flv
Jessielove	posted 05-18-2009 06:32 PM ET (US) As the man said... coolness factor.
DeeVee	posted 05-18-2009 10:19 PM ET (US) I have never owned a boat with twin outboards, and may never in my life- but I would love to have a boat rigged with twins. I agree with the "coolness factor" opinion. Doug
Hilinercc	posted 05-19-2009 11:31 AM ET (US) I once served as a Chief Engineer on a corporate motor yacht (115' Benetti) We had 2 Whaler tenders, one was a Montauk with a well worn 90hp V-4 Johnson, and the other was a 19' Outrage with twin 70hp 3 cyl. Evinrudes. Both boats were fun to drive, but the Outrage with the twin 70's was a total blast. Those dual 70's singing on the stern when tached up was beyond cool. The first mate and myself raced these two boats once, and we discovered (not surprisingly) that the Montauk had a slight edge in top end speed (it gradually inched forward of the Outrage) but it was no smack down. The owner of the yacht used the Montauk as a "chase boat" for his jet skis, while the Outrage was the "water taxi". I found myself using the Outrage a whole lot more than the Montauk, simply because the twin 70's were a joy to run, and who ever sees twins on a 19' these days?
TransAm	posted 05-19-2009 11:41 AM ET (US) When you are miles from port, and it is a very humid 95 degrees, stagnant and with no wind, and you blow a powerhead, it is very "cool" when you can make way and create a significant breeze in your journey home on the 2nd motor.
Fishcop	posted 05-19-2009 12:35 PM ET (US) Holly Crap Larry! Are those new motors? They sure sound sweeeet! I sold my 25' when the fuel prices went up, but looking at yours, I may get another ;-) Andy
L H G	posted 05-20-2009 12:31 AM ET (US) Andy those are 1997 200 EFI's, with a lot of hours on them. They just run and run and run, no service needs at all, except for the routine stuff.