Paul:

This is the link that should have been sent for the 12v
system.

http://www.cpowert.com/products/speedstart.htm


Greg in Canada

Looks perfect for a 12 Volt starter alternator.
The big questions are; what does it cost and what does
it weigh? The liquid cooling is good.

Paul Lamar

The website states temp should not exceed 105C/221F.
Isn't that a bit cooler than we want the engine?
C. Smith

That is about right. What bothers me is what happens to
your starter alternator
if the temp exceeds 105C. This spec. seems a bit marginal.

BTW for those people that have not heard the rational for
these systems
take a look at these jpgs.

I found it interesting that Government Motors discontinued
them and
reconfirms the logic that unless a fuel saving device, like
a hybrid
or starter generator clearly pays for it self in fuel
savings, people
will not buy it. I wonder how well they are selling in
Europe
where gas is $5 to $7 a gallon and global warming hysteria
is
more prevalent.


Paul Lamar

Paul:

Here's the reply back from SpeedStart.  Not
encouraging for aircraft with unit weight at 11.8 kg (26
lbs).

Greg,

Can you provide any more details about your intended
application and timing both of which could affect
project/unit costs.

Our SpeedStart product is currently at the production
intent design stage with design validation testing of the
final design underway and high volume production targeted at
Q4 2012. We are producing SpeedStart in batches ahead of
that time.

The unit weighs 11.8kg and has been designed for 12V and
24V use, though calibration for 24V has not yet been
scheduled.

We have supported one design study for a gear drive
installation and do not see a reason why it would not work,
though we would need more information before commenting
further.

Regards,

Nick Pascoe
Business Development Director and CEO
Controlled Power Technologies
Tel:     +44 (0) 1268 564805
Fax:    +44 (0) 1268 564852
Mob:  +44 (0) 7872 604351
Email:  nick.pascoe@cpowert.com


Greg Fleming

I'm wondering about the ratio of starter/generator to engine speed.
Their generation chart maxes out at 18k rpm.  I don't know if that
is the max speed of the gen, but since we max out the 13b at
6k-9k rpm for t/o we would need a 2-3 to one ratio.  Would the
starter even turn the engine over at a 2.5 to 1 ratio?


Dan Stanzione


Greg,

Good news but much heavier than a separate alternator and starter motor.
Remember the controller is going to have some significant weight.  How about cost?


Doug in Japan

I have a prediction that starter generators will become quite common
place in automotive applications over the next couple of years.
C. Smith