Hello,

  I was wondering if anybody could furnish me with performance figures for the 40' SPT's?

  I'm trying to estimate probable litres/hour and range in NM, but I've really got nothing to go on...

  Can anybody correct my estimates or fill in the following blanks for me?

Planing Speed (kts):

20
Top Speed (kts):25
Engine Capacity (cc):3000
RPM at Planing Speed:3000
Max RPM:4500
Litres/Hour at Planing Speed:80

Litres/Hour at Max Speed:

Tank Capacity (Litres):

250
Max Range (NM):200

  Thanks for any help,

Paul

...sorry for the horrible formatting :(

...which I've now fixed :)

Surely I can't have foxed all you knowledgable chaps?

I've found that the fuel tanks were self-sealing 70 gallon items...

Can anybody help?

Paul

The 40ft Mk.1 performance is as follows

Maximum speed         & nbsp;     23.0 knots

Cruising speed         & nbsp;       20.0 knots

Duration at Max RPM         1/2 hour

Total fuel         &n bsp;         &n bsp;    130 gallons*

Endurance        &nb sp;         &nb sp;    290 miles*

* Craft Nos. 304-313, 367-399, 402-421, 425-435, 446-486 & 1520 fitted with 80 gallon tanks - endurance - 210 miles.  Craft Nos. 446 - 455 built in teak.

Props 16.75" Dia x 16.5" pitch - Left Hand. Tailshafts 1.25" dia.

Hope this answers your question.

Hi Donald,

thanks for that - the tanks were a lot bigger than I thought.  Would they have had a single fuel tank or one for each engine? 

Thanks for the information on the props - at some point in the future, I'm going to have to find a pair for my boat... Were they both left handed?  I had wondered whether they counter-rotated...

Thanks again,

Paul

Yes both props were left handed and the fuel tank (single) was fitted in the aft peak.