Dear Anand, It all depends.
I.e., the boat, given still water and no wind is easy to pull if you have somewhere to pull from as long as you don't need much speed. bodies of water are generally relatively flat the cart, given a flat street (or rails) and very hard tires and good bearings for the axles will be much easier to move through the water as the speed increases. large bodies of land mass are on the average not very flat at all. a sailed conestoga wagon on pavement short hawled would probably reach a much higher speed than an equivalently loaded sailboat of the same sail area. regards, ron w h -----Ursprüngliche Nachricht----- Von: "Anand Karve" <[email protected]> Gesendet: May 26, 2011 5:57:03 PM An: "Discussion of biomass pyrolysis and gasification" <[email protected]> Betreff: Re: [Gasification] Underwater gasification? >Dear Henri, >you have misunderstood me. I said that hauling a boat floating in >water was easier than pulling a cart on land. I was comparing the >friction of the boat with water with the friction of a loaded cart on >land. The density of air and water have nothing to do with it. I >mentioned air only as a motive force. Wind can move a boat easily >through water but the wind of the same velocity would be unable to >move a cart on a road. >Yours >A.D.Karve > > >On Thu, May 26, 2011 at 10:35 PM, Henri Naths <[email protected]> wrote: >> Dear Anand and List >> My "cart" is a vw Jetta that out weights my Boat of equal hp by about 3,1/2 >> times. My cart's hp /weight ratio efficiency is approximately 5x better than >> my boat... I tend to disagree with Anand because the density of water is >> ~700 times that of air. >> H >> ----- Original Message ----- From: "Anand Karve" <[email protected]> >> To: "Discussion of biomass pyrolysis and gasification" >> <[email protected]> >> Sent: Sunday, May 22, 2011 9:32 PM >> Subject: Re: [Gasification] Underwater gasification? >> >> >> Dear List, >> hauling a boat through water is much easier that pushing a loaded cart >> over land. That is how wind pushed large ships around the world, >> whereas for land transport one needed animal power. A steam jet looks >> very attractive for a small boat. If one can take up the water >> continuously from the river or lake itself, a relatively small boiler >> would suffice for generating the steam. >> Yours >> A.D.Karve >> >> On Mon, May 23, 2011 at 7:51 AM, Daniel Chisholm <[email protected]> >> wrote: >>> >>> A Humphrey-inspired water jet is an interesting idea. >>> FWIW I don't think it would be an efficient means of low speed marine >>> propulsion though; it would suffer from low propulsive efficiency because >>> the jet velocity would be too high. The efficiency of a reaction engine >>> (which is something that generates thrust by accelerating and expelling >>> mass >>> - a very broad category that includes not just jet and rocket engines but >>> also propellers on aircraft and ships) depends on the speed at which the >>> mass is expelled. Accelerating a small mass to a large speed, is not as >>> efficient as accelerating a larger mass to a lesser speed. If you look at >>> aircraft jet engines today (high bypass ratio turbofans) you will notice >>> that they are much larger in diameter than the jet engines of the 1950s >>> (turbojets) - this is why. >>> >>> -- >>> - Daniel >>> Fredericton, NB Canada >>> >>> _______________________________________________ >>> Gasification mailing list >>> >>> to Send a Message to the list, use the email address >>> [email protected] >>> >>> to UNSUBSCRIBE or Change your List Settings use the web page >>> >>> http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org >>> >>> for more Gasifiers, News and Information see our web site: >>> http://gasifiers.bioenergylists.org/ >>> >>> >> >> >> >> -- >> *** >> Dr. A.D. Karve >> President, Appropriate Rural Technology Institute (ARTI) >> >> *Please change my email address in your records to: [email protected] * >> >> _______________________________________________ >> Gasification mailing list >> >> to Send a Message to the list, use the email address >> [email protected] >> >> to UNSUBSCRIBE or Change your List Settings use the web page >> http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org >> >> for more Gasifiers, News and Information see our web site: >> http://gasifiers.bioenergylists.org/ >> >> __________ Information from ESET NOD32 Antivirus, version of virus signature >> database 6155 (20110526) __________ >> >> The message was checked by ESET NOD32 Antivirus. >> >> http://www.eset.com >> >> >> >> >> _______________________________________________ >> Gasification mailing list >> >> to Send a Message to the list, use the email address >> [email protected] >> >> to UNSUBSCRIBE or Change your List Settings use the web page >> http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org >> >> for more Gasifiers, News and Information see our web site: >> http://gasifiers.bioenergylists.org/ >> > > > >-- >*** >Dr. A.D. Karve >President, Appropriate Rural Technology Institute (ARTI) > >*Please change my email address in your records to: [email protected] * > >_______________________________________________ >Gasification mailing list > >to Send a Message to the list, use the email address >[email protected] > >to UNSUBSCRIBE or Change your List Settings use the web page >http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org > >for more Gasifiers, News and Information see our web site: >http://gasifiers.bioenergylists.org/ _______________________________________________ Gasification mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org for more Gasifiers, News and Information see our web site: http://gasifiers.bioenergylists.org/
