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Old 08-30-2015, 10:09 AM   #1
long-cours.62
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City: Szczecin
Vessel Name: Dryade
Vessel Model: Trawler 72
Join Date: Mar 2012
Posts: 738
"Trawleurised" a semi displacement or a planning hull !?

"Trawleurised " a semi displacement or even planing hull!?
Possible ou utopic ?
If I take a look at the selling price of a second hand"planning" motor boat and the price of the motor boat with the "stick" "trawler" or "greensomething" , for the same size, same age a "planning" motor boat is actually discounted at the fraction of the selling price of a "trawler " one.
But if we take a closer look, exept for the boats like the Passagemakers Litle 56, Longcours 62 , Dashew 64', Garcia 54 etc who keep a reasonnable consumption, under the Flag "Trawler" we can find some boat (at similar size) who have horse power, more windage, heavier, mostly beamer and a fairly big consumption per mille !
Hence my question, rethinking the transom waterline, propellers, engine setting, would not it be possible to optimize a "planning hull" to make her at least almost similar (in lt per mille) than the trawler having similar charactéristics ?
At the "hull speed"
Or "worst " by how much 10%, 15%, 20% !?
 
 
For example some boat classified under the name "Yrawler" we can find :
- Séléne 53 43T 405 cv 3,2 lt/mille à 10 nds
- Etoile 65'(cata) 30T 2X250 cv 4,3 lt/mille à 10 nds
- Less 83 55T 325cv 3,7 lt/mille à 10 nds
- Swift Trawler42 2X300 cv 3,3 lt/mille à 10 nds
- GB 41 EU 2X425 cv 5,1lt/mille à 10 nds
- Greenline 70 2X800 cv 5,6 lt/mille à 10 nds
- Sunreef 70 2X800 cv 4lt/mille à 11 nds
- Adagio 58 2x575 cv 4,7lt/mille à 10,4 nds
- Swift Trawler 50 2X435 cv 4,1 lt /mille à 9,1 nds 7,4lt/mille à 16,5 nds
- Grand Bank 2x715 cv 6lt/mille à 10nds
(oups forgot the model !)
- Rhéa Trawler 47 2x350 cv 4,7lt/mille à 9,8nds
- Séléne 62 2X715 cv 2,9lt/mille à 10,5 nds !!??
- Sélène 66 610 cv 4,6lt/mille à 10,4nds
- Sélène 54 2X405cv 7,6li/mille à 10,4nds
- Ocean Alexander 60Classico
2x550 cv 9,3lt/mille à 11?7nds et 6,8lt/mille à8nds
- GB 52 EU 2x567cv 6,4lt/mille à 11,2nds et 3,25lt/mille à 9,2nds
- GB Aleutian 53 RP 2x836cv 7,45lt/mille à 11nds
- Swift trawler 52 2x575 cv 4,6lt/mille à 10,4 nds
In another hand one optmised hull ( ok it is just one extrem for the fun )
Stromfugel Fulmar à 58nds 4,1lt/mille
More "classics" planing hulls :
- Fairline Squadron 48 2x435cv 2,4lt/mille à 9,2nds
- Princess V48 4,9 2x435 cv 4,9lt/mille à 10,5nds
- Sarnico 60' 2x1000cv 5,33lt/mille à.....15nds !
 
After reading these resume it is clear that some still receive the name " trawler " but they consume more and have bigger engines than many "fast" motorboats and sometimes even with much smaller tanks !
And for the difference of the hull line some are very close just the deck plan and superstructure change

Sorry for my English today it is worst than normally !! How said it is not possible !!
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