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sigma 51 version 2

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Old 08-03-2012, 01:02 AM
  #1  
phillio35
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Default sigma 51 version 2

any one got one and what setup are you runing and how does it perform
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Old 08-03-2012, 01:30 AM
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dboxcar
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Default RE: sigma 51 version 2

got a version 1 myself but seen daves v2 at birkenhead regular goes very well cg critical as with v1 use stick on weight on nose ! it is more stable than the v1
run the boat wet raising the strut but angle down to push front end round corners make sure rear surface areas under hull are perfectly flat no hooks or rockers anyslight ones hamper handling greatly
keep fuel tank behind engine not infront under the deck !

http://www.prestwich.ndirect.co.uk/s...structions.htm

if your having problems chat with dave at pmb


is your the one on ebay ?
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Old 08-03-2012, 07:48 AM
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phillio35
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Default RE: sigma 51 version 2

someone said they dig in on a right hand turn and they dont come out of a turn unless you back down of the throttle also the freeboard is to thin acts like a turn fin
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Old 08-03-2012, 08:29 AM
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dboxcar
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Default RE: sigma 51 version 2


ORIGINAL: phillio35

someone said they dig in on a right hand turn and they dont come out of a turn unless you back down of the throttle also the freeboard is to thin acts like a turn fin

not heard or seen them problems
heres a clip of my sigma it wasnt set up proply due to being thrown back together ! you will see its skipping on the straights as my cgwas out by 5-10mm but on corners it still held speed ok !

http://www.youtube.com/watch?v=gFbjOilZe24

if the boat is setup correctly they go round corners at full speed ! they need to run wet if not the front end will dig in on a turn

the center of gravity has to be spot on then the rest is down to setup

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Old 08-03-2012, 03:51 PM
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Default RE: sigma 51 version 2

My apprentice Kees Zwartbol is using 2 Sigma's V-1's in the WC FSR-O-27 and FSR-O-35 in Dessau.

In the prelim's he was 2nd , in the final a blew an engine. :-(

Our Sigma's run level (finned) stuts and nearly NO tab's. It's all about set-up and balancing the hull.

And not running wet ... but running level !

Using short square turn-fins and a deep non-tapered 'kicked-in' rudder.

Shorten the 'strakes' as on the yellow-one ,
that will lower the stern and lift the bow , preventing the 'digging-in' in R-hand corners.

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Old 08-04-2012, 12:42 AM
  #6  
phillio35
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Default RE: sigma 51 version 2

hi hendrix you mean front or back stracks and by how much
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Old 08-04-2012, 12:45 AM
  #7  
phillio35
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Default RE: sigma 51 version 2

could you get me some pics of the setup and was that the v2 thanks mate also have your mate got his pump from jettec yet
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Old 08-04-2012, 01:49 PM
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Default RE: sigma 51 version 2

Seen one digging in at our lake and it not wanting to release the turn.... Hes more aless got it sorted know after long talks with Prestwich.
Very quick stable boat when its set up correctly.

Jack
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Old 08-04-2012, 02:50 PM
  #9  
HendricX
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Default RE: sigma 51 version 2


ORIGINAL: phillio35
hi hendrix you mean front or back stracks and by how much
If you mean the inner and outer strakes ?

Outer ones starts 150mm from stern.

Inner ones starts 200mm from stern.
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Old 08-06-2012, 05:03 AM
  #10  
c.k.y.
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Default RE: sigma 51 version 2



ORIGINAL: HendricX

My apprentice Kees Zwartbol is using 2 Sigma's V-1's in the WC FSR-O-27 and FSR-O-35 in Dessau.

In the prelim's he was 2nd , in the final a blew an engine. :-(

Our Sigma's run level (finned) stuts and nearly NO tab's. It's all about set-up and balancing the hull.

And not running wet ... but running level !

Using short square turn-fins and a deep non-tapered 'kicked-in' rudder.

Shorten the 'strakes' as on the yellow-one ,
that will lower the stern and lift the bow , preventing the 'digging-in' in R-hand corners.

Hi hendrix
Why do not I see you?
I have some live photos
CKY
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Old 08-09-2012, 10:37 PM
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Default RE: sigma 51 version 2

guys i need some help for a fellow boater. he bought a hull that looks like a sigma 51 v1 with the long rails. we cannot get the hull to recover after a strong right hand turn, it digs in and keep on turning. so far he cannot use it for heat raceing and he bought it for this purpose. we moved the motor backwards, it is better but still hooking, we tried about 20 props on it and the abc 2714/3 chopper works the best. if he should cut the rails shorter as suggested will it help?
any inputt will be much helpfull.
thanks
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Old 08-09-2012, 11:49 PM
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Default RE: sigma 51 version 2

is it the new one version two or old one? ive got the same problem i had to lower the engine down as far as i could get it also centre of gravity is 460 mm .where is your fuel tank? should be
behind engine
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Old 08-10-2012, 06:33 AM
  #13  
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Default RE: sigma 51 version 2

strong rudder servo, 1/4 scale would be good. Straight pushrod, and make sure your "in on the servo horn and out on the rudder horn" for maximium torque.
If it still hooks after that tilt the bottom of the rudder to the right, but straight is better.
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Old 08-10-2012, 05:02 PM
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Default RE: sigma 51 version 2


ORIGINAL: wet a wild

guys i need some help for a fellow boater. he bought a hull that looks like a sigma 51 v1 with the long rails.
If the botom is like the Sigma .. and the deck isn't ... quite sure you have a Patron-Saint .... :-(

Don't know what the copyers did wrong , but Lance Longo (also from SA)

tried to get it to run properly , and did not succeed .. and threw it in the dustbin .. sorry.

If over 40 years of setting-up boats don't help .. there probably is no cure.
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Old 08-10-2012, 09:42 PM
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Default RE: sigma 51 version 2

hi to all that give some ideas. he use a 20kg savox servo and it is set up like mentioned above. cg i am not sure about what i well know is that he moved motor 2'' closer to transom, fuel tank between radioboxs and motor. the bottom of the sigma and patrion saint looks identical but the deck is definitly sigtma 51 with the 1 airvent on left. the hatch is not patron saint. with the hatch on it is by far the worst. this hull was bought from a local racer.
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Old 08-11-2012, 03:11 PM
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Default RE: sigma 51 version 2

Kick the rudder IN for 3 to 5mm ... and use a square rudder-blade.
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Old 08-12-2012, 01:05 PM
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Default RE: sigma 51 version 2

V1 Sigmas do not oversteer unless as I once saw someone had pulled the rails in because the engine mount need spacing washers between it and the rails. A Patron Saint hull is not the same as a Sigma but it is a handful in the corners. On a V2 Sigma make sure the rudder is the height above the bottom of the hull shown in the instructions and CG not too far forward. Kick the bottom of the rudder forward if necessary. The best running Sigmas I saw at the World Champs ran with tabs.
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Old 08-19-2012, 06:15 PM
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Old 04-28-2019, 03:09 PM
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Exclamation sigma v1

hi people! im looking for a prestwich sigma v1, someone know where i can buy one? i have already sen the prestwich page but they are too expensive there
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