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View Full Version : Tuned Briggs & Stratton 'Rampage' engine - power figures etc



ivanpullen
12-Apr-12, 04:56 PM
Hello everyone

We've been working on the Briggs & Stratton 35bhp 'Big Block' engine to extract more performance from it whilst retaining its legendary reliability.

After lots of work, and finally getting it aboard a dyno, the results are in.

Take a look if you're interested, we got some big torque increases!

http://www.flyingfishhovercraft.co.uk/blog/post/2012/04/12/Rampage-The-final-figures-are-in-for-the-UKs-most-exciting-small-hovercraft-engine!.aspx (http://www.flyingfishhovercraft.co.uk/blog/post/2012/04/12/Rampage-The-final-figures-are-in-for-the-UKs-most-exciting-small-hovercraft-engine%21.aspx)

Regards

Ivan - Flying Fish.

Al
13-Apr-12, 07:11 AM
The link takes me to the title, but no results

KevinT
13-Apr-12, 12:24 PM
Same here-thought it was my browser (IE8) - I get a blank page up.
Also same result for some of the other links on the main Home page.

datkins
13-Apr-12, 06:34 PM
works in chrome, or does for me....

ivanpullen
13-Apr-12, 07:02 PM
Strange! Not sure why that is, works fine on safari. If you go to the website and click through to the blog, you should find it. Otherwise, take a look at our Facebook page.

Keith Oakley
13-Apr-12, 08:33 PM
Chrome gets it ok for me but not IE9 - on the same PC! Is this info anti Microsoft?
Keith

Hovertrekker
14-Apr-12, 01:00 PM
Worked for me in Chrome. I stopped using IE a long time ago!

Paul Fitz
14-Apr-12, 04:42 PM
Snip-- Is this info anti Microsoft?
Keith

No Keith, Internet Explore is anti ASP. It has been since Version 7. It is possible to render an ASPx page in IE9 but it takes a bit of digging and possibly switching it to compatibility mode.

Probably quicker to download Chrome or Opera (my choice for several years) and have a "Standard" browser. Faster too.

Paul

Philip
14-Apr-12, 07:35 PM
Works ok with Firefox, more importantly its good to see some real world testing of these engines. 50+hp at 5000rpm is a good result as is that flat torque curve.

gaz
15-Apr-12, 05:39 AM
I am in the same boat (IE9) so can't read the report. There are also a few who read this forum who are on 'works' computers and will be unable to install alternative browsers.
Ivan, any chance you could attach the report as a pdf to this thread? many of us would love to read it.

broad5186
16-Apr-12, 11:46 AM
a 50Hp quiet reliable 4 stroke with bags of torque - would love to race one against F3 F50 but it would currently be classed as F1 could a trial be done ?

RussHudson
16-Apr-12, 01:01 PM
Its definitely something that should be looked into Tony, it would make F50 more sustainable.....

a 50Hp quiet reliable 4 stroke with bags of torque - would love to race one against F3 F50 but it would currently be classed as F1 could a trial be done ?

broad5186
16-Apr-12, 02:29 PM
i agree Russ - i've often advocated a 50Hp formula, F50 was named as a 50 Hp formula not a single engine formula - the closeness of the F3/F503 challenge race at Jakes showed how close it could be

the argument is you can't measure horsepower but you can easily measure thrust and there's only so much thrust 50Hp can produce so have a sensible thrust limit set with random checks as craft come in from races or go onto the start grid

certainly sustainable and ticks the green box too and even an option for endurance

good work Ivan looking forward to seeing it in a craft

ivanpullen
16-Apr-12, 05:31 PM
Hi all, try again if you'd like to see it. There was a compatibility issue with our blog and IE, now sorted I hope, try the link.

Russ has spoken to Chris daly about the possibilty of using one of these engines for trialling in F503, whilst not born as a race engine - it's certainly interesting. We would need somebody to provide a competitive hll of course! Russ & Gary from flying fish will be running one in formula ER in June as well.

Bob Rennick
16-Apr-12, 09:03 PM
F50 was named as a 50 Hp formula not a single engine formula

is not quite true. In fact, it was first envisioned as Formula 500, as in 500cc.


the argument is you can't measure horsepower but you can easily measure thrust and there's only so much thrust 50Hp can produce so have a sensible thrust limit set with random checks as craft come in from races or go onto the start grid certainly sustainable and ticks the green box too and even an option for endurance

I certainly agree with this! You only have to allow for a variance in efficiency and thrust disc diameter.


good work Ivan looking forward to seeing it in a craft

and I definitely concur with this one!

Bob

hyde4683/01
19-Apr-12, 06:02 AM
Perhaps rather than a thrust limit, where any spare thrust could be used as lift, a max fan speed. Perhaps if this was quite slow it would favour the heavier 4 stroke ( different speed for different no of blades ) this would help with noise and development,

Just a thought

Duncan