[MHml] horsepower & sleds

[Michael Conley]

hello brain
        Just what is the difference between the durajet and the rim drive? besides the durajet having 5 blades and what looks like a simpler drive compared to the rim drive.E-tec are supposed to get the same economy as a four stroke and you don't mix the oil. I am interested because I bought a 60 hp durajet but have yet to try it out.
  Mike

Bill Gibbs <billg at gibbsCAM.com> wrote:
      So the durajet is more efficient?
   
  How does the e-tec compare to a Honda 4 stroke for fuel consumption?
   
  I notice it's lighter, which is something.  But my old 2 stroke had twice the gas consumption of my Honda 4 stroke, and a 20hp honda pushes me better than my old 35hp 2 stroke Tohatsu.
   
  Bill

    
---------------------------------
  From: multihulls-bounces at steamradio.com [mailto:multihulls-bounces at steamradio.com] On Behalf Of Michael Conley
Sent: Thursday, February 01, 2007 11:08 PM
To: Informed discussion of multihull issues
Subject: Re: [MHml] horsepower & sleds


  
  Bill
     Durajet was developed by evinrude for the seals and the likes because they could not get a rib  up on a plane with men and equipment to much power lost from the tips of the props. they inclosed it with a tube and the problem went away. plus no side thrust from the prop
  mike

Russell_P_Davis at cox.net wrote:
  Gear shifting like modification of a jet ski for heavy tow service:

An edutor can distribute the force of a high speed water jet over a large
bulk of water so that much less power is lost in slip, turbulence and shear.
I think the idea maybe to move a lot of displacement water - not heat up a
little bit of water.
Russell

----- Original Message ----- 
From: "Diane Selkirk" 
To: "Informed discussion of multihull issues" 
Sent: Thursday, February 01, 2007 11:00 PM
Subject: Re: [MHml] horsepower & sleds


> Bill Gibbs wrote:
>> Hmmmm...
>> Hadn't thought of a jet ski.
>> Aren't jets a lot less efficient than props, especially at lower speeds?
>>
>> Bill
>>
>>
> Generally yes, the cross over is about 25 knots. Jets have smaller
> diameter impellers (less efficient than a big prop) but make up for it
> with less drag from strut/shaft/rudder.
>
> I can't see the pitch of a jet ski impeller as being suited for pushing a
> big 10,000 lb boat.
>
> Evan Gatehouse
>
> _______________________________________________
> Alter your subscription details or unsubscribe at the bottom of this page:
> http://www.steamradio.com/mailman/listinfo/multihulls
>
> Multihulls mailing list (Multihulls at steamradio.com)
>

_______________________________________________
Alter your subscription details or unsubscribe at the bottom of this page:
http://www.steamradio.com/mailman/listinfo/multihulls

Multihulls mailing list (Multihulls at steamradio.com)


    
---------------------------------
  TV dinner still cooling?
Check out "Tonight's Picks" on Yahoo! TV. _______________________________________________
Alter your subscription details or unsubscribe at the bottom of this page:
http://www.steamradio.com/mailman/listinfo/multihulls

Multihulls mailing list (Multihulls at steamradio.com)




 
---------------------------------
No need to miss a message. Get email on-the-go 
with Yahoo! Mail for Mobile. Get started.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://steamradio.com/pipermail/multihulls/attachments/20070203/7bfc02a2/attachment.htm