SIMPLE - Legal Mono or Not?

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Darin Jordan

Well-Known Member
Joined
Mar 11, 2005
Messages
1,821
Won't argue at all. Just need some experts to rule. Is this a legal NAMBA and/or IMPBA mono or not??

Thanks,

Darin

Mono_or_Not_x.JPG
 
Offshore only in IMPBA! Straight form the IMPBA rule book .

a. A hull that has no discontinuities between or steps in the wetted surface running at more than a 15-degree angle with keel, in plane view (bottom view).
 
The only things I can think of would be that it might work like a step hull in the turns and might help initially getting the boat up on plane
 
Where the break is located, is it considered part of the riding or wetted surface at planing speed?
 
Andy,

I have tried steps in various spots on my mono hulls over the years and run them in races as hydros. I got 6th or 7th place at the Indy Unlimited one year with a stepped mono with over 100 boats all in the same class. Most all hydros. Just thought it would be fun. Point is I like to experiment and try new things to keep modeling interesting. I have found the difference in steps on a mono vs no steps to be negligible for full out racing because if a mono is trimmed out correctly only the rear inch or two is touching the water. I did run steps like the picture in this thread on a Seaducer as a matter of fact and it did not change a thing in cornering. All that said to say....... The rules have to be written to cover many scenarios and this step for example while looking harmless, if it was legal: someone would make it larger and larger until the boat became a full blown hydro. The only way to keep a mono class different from a hydro class is to eliminate steps.

John
 
Andy,

I have tried steps in various spots on my mono hulls over the years and run them in races as hydros. I got 6th or 7th place at the Indy Unlimited one year with a stepped mono with over 100 boats all in the same class. Most all hydros. Just thought it would be fun. Point is I like to experiment and try new things to keep modeling interesting. I have found the difference in steps on a mono vs no steps to be negligible for full out racing because if a mono is trimmed out correctly only the rear inch or two is touching the water. I did run steps like the picture in this thread on a Seaducer as a matter of fact and it did not change a thing in cornering. All that said to say....... The rules have to be written to cover many scenarios and this step for example while looking harmless, if it was legal: someone would make it larger and larger until the boat became a full blown hydro. The only way to keep a mono class different from a hydro class is to eliminate steps.

John
I can tell you that more time was spent on this definition - what's a mono - than any other part of the rule book when we put it all on paper and did the first printed rule book.

Thanks John
 
Andy,

I have tried steps in various spots on my mono hulls over the years and run them in races as hydros. I got 6th or 7th place at the Indy Unlimited one year with a stepped mono with over 100 boats all in the same class. Most all hydros. Just thought it would be fun. Point is I like to experiment and try new things to keep modeling interesting. I have found the difference in steps on a mono vs no steps to be negligible for full out racing because if a mono is trimmed out correctly only the rear inch or two is touching the water. I did run steps like the picture in this thread on a Seaducer as a matter of fact and it did not change a thing in cornering. All that said to say....... The rules have to be written to cover many scenarios and this step for example while looking harmless, if it was legal: someone would make it larger and larger until the boat became a full blown hydro. The only way to keep a mono class different from a hydro class is to eliminate steps.

John
I can tell you that more time was spent on this definition - what's a mono - than any other part of the rule book when we put it all on paper and did the first printed rule book. Thanks John
You are entirely welcome John

Sent from my iPhone using Tapatalk
 
I think a lot of the English and European multi hulls run that type of design (FSR Multi), My Silak hull has them and is an old style multi boat, rather than heat racing mono
 
Yes your right Shane, only for the purposes of replacing trim tabs the you couldn’t run on them as all running gear has to be submerged under the boat not on transom
 
Darin, is the break only on the one side? Looks that way from the picture.

Yea, just on the right side of the hull.

This one isn't mine. It's something that OSE was testing. I don't think that they realized it had that "break" on it when they ordered it to try.
 
Andy,

I have tried steps in various spots on my mono hulls over the years and run them in races as hydros. I got 6th or 7th place at the Indy Unlimited one year with a stepped mono with over 100 boats all in the same class. Most all hydros. Just thought it would be fun. Point is I like to experiment and try new things to keep modeling interesting. I have found the difference in steps on a mono vs no steps to be negligible for full out racing because if a mono is trimmed out correctly only the rear inch or two is touching the water. I did run steps like the picture in this thread on a Seaducer as a matter of fact and it did not change a thing in cornering. All that said to say....... The rules have to be written to cover many scenarios and this step for example while looking harmless, if it was legal: someone would make it larger and larger until the boat became a full blown hydro. The only way to keep a mono class different from a hydro class is to eliminate steps.

John
John, again I tried to cover steps and other planing issues in my High Speed High Speed Hull Design Series. Steps probably help boats with a lower power to weight ratio than we have with models. A lot of interesting things have been tried. If you want to run a legal stepped mono, you can move the tabs a little up from the bottom of the hull to create a step. Below is a picture showing a crackerbox that is using the tabs as part of the planing surface.

Lohring Miller

P1010043.JPG
 
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