Verado Find

rodbolt

Supreme Mariner
Joined
Sep 1, 2003
Messages
20,066
Re: Verado Find

hello<br /> yep<br /> there is so many horse power hours in a casting.<br /> you can have it all quick or have some for a long time. <br />in the late 70's early 80's merc had a 300hp 2 stroke v6. was the fastest motor ever, however it did spend a lot of time behind a tow rope. then in the mid 80's,early ninties it was rereleased. had a caveat, you HAD to change the reeds every 100 hours. the 100 hours was later found to be rather optimistic. the problem was the initial cost. longjevity and the catastrophic nature of the engine failure when it leaned out. <br /> can the verado be increased. most likely. however for mass production and current hulls prop speed is still a limiting factor. unless you go with a surface piercing set up about 2800 RPM on the propshaft is about all you can get and still keep it hooked to the water. aircraft props suffer a similar problem ony they also have to contend with the prop tips breaking the sound barrier.
 

lark2004

Lieutenant Junior Grade
Joined
Jul 12, 2004
Messages
1,080
Re: Verado Find

aircraft props suffer a similar problem ony they also have to contend with the prop tips breaking the sound barrier.
Sounds great don't it? Just love hearing that sound at the air shows when the stunters are doing their stuff
 

walleyehed

Admiral
Joined
Jun 29, 2003
Messages
6,767
Re: Verado Find

I can do it in my B-36TC Bonanza too!!!<br />Doesn't sound as good when your inside though...<br />This brings up an interesting comparison here....we went from 2bld to 3 bld to get the diameter down due to tip speed, which quiets things a bit. 2bld has more thrust than 3bld though (low-speed-MPH). 4bld is quieter yet, but slower, and our 5blade hartzells are the only props that will harness the high shaft-HP turbines and still have any efficiency...point here is the 3-bld has proven to be the fastest aircraft prop configuration...half-way between total efficiency and quiteness...
 

Triton II

Commander
Joined
Nov 23, 2004
Messages
2,479
Re: Verado Find

walleyehead...<br />
...point here is the 3-bld has proven to be the fastest aircraft prop configuration...half-way between total efficiency and quiteness...
Fastest aircraft? In production form probably the Sea Fury - 5-blade prop. However a big slimline turboprop such as a P3C Orion will cruise faster at altitude - 4-blade props. Some would argue the Grumman F-8F Bearcat (4-blades) or the Chance Vought F-4U Corsair (initially 3-blades but later, faster models had 4-blades) are faster than the Sea Fury.<br />I'm not about to correct your statement about 3-bladed props because in general terms (for everyday aircraft) I'd have to agree with you. However for ultimate speed, the 4 or more blade prop was used more often than not by the manufacturers of those wonderful 40s and 50s prop fighters. <br />PS: I was born at RANAS (Royal Australian Naval Air Station) Albatross at Nowra Hill, NSW. My earliest memories are of lying awake and listening to Hawker Sea Furies and Fairey Fireflies (4-blades) as they did night circuits.
 

walleyehed

Admiral
Joined
Jun 29, 2003
Messages
6,767
Re: Verado Find

The number of blades added was to harness the power without increasing pitch to the point of inefficiency. This case only applies to that type aircraft where the power to weight ratio was very high...took alot of extra power to pull extra blades but the power was there and so was the thrust...<br />Nothin' better than a cacklin' radial is there..??? :) <br />Of course the V-12's had a sound of their own as well..
 

Triton II

Commander
Joined
Nov 23, 2004
Messages
2,479
Re: Verado Find

You're not wrong... love that sound, especially when they throttle back. And Ed Kurdzeil's Firefly is flying the US airshow circuit now... powered by the RR Griffon V-12... if you get the opportunity to see and hear it, take it - it's a masterpiece! :cool:
 

muskyone

Master Chief Petty Officer
Joined
Mar 17, 2003
Messages
814
Re: Verado Find

i don't know anything but i saw on trucks this weekend banks said he was going to get 7000rpms out of a duramax diesel and make it relieble are you doubters saying he cant do i see no diff
 

rabidfish

Senior Chief Petty Officer
Joined
Oct 3, 2000
Messages
788
Re: Verado Find

Are you saying his 7000 rpm engine has the same reliability as a 4000 rpm engine?
 

lark2004

Lieutenant Junior Grade
Joined
Jul 12, 2004
Messages
1,080
Re: Verado Find

I bet it can't run 7000rpm for 300 hours straight.
 

muskyone

Master Chief Petty Officer
Joined
Mar 17, 2003
Messages
814
Re: Verado Find

yes that’s what he says he’s going to do look I made it to 10th grade but my dad was a eng he did stuff that everyone said wasn’t possible all the time not with cars but lcd, s so I don't think anything can not be done with today’s metals and oils and computers reliability in a 300+ outboard could happen practical probably not
 

tommays

Admiral
Joined
Jul 4, 2004
Messages
6,768
Re: Verado Find

i can only say that diesel engines got there great reputation from big trucks that dont turn more than 2400 rpm and ships that also run at very low rpm i havent seen any high speed marine or auto diesel that last remotly as long as there low speed brothers<br /><br />if you look at the Verado you will find that the 200 HP modle can make 200 hp on 87 octane if you look at the 275 HP it will run on 87 but requires 92 octane to make 275 HP.<br /><br />it would seam to me they have taken it as far as pump gas is going to allow ,that doesent leave you much room to tweak on the motor unless your going to start pulling up to the nascar gas dock<br /><br />tommays
 

beniam

Petty Officer 2nd Class
Joined
Feb 2, 2005
Messages
113
Re: Verado Find

Jason S<br />Sounds like you are one smart dude. Ever think of discovering the negative one law of thermodynamics, since the zero th law already exists. Think of it, you could get the imagenary Nobel prize (square root of negative Nobel). Keep us posted, or you could even try for the Darwin award. Just an old dirt(but degreed)engineer. Batavier
 
Top