Turn Fins on Monos

[Terry Keeley]

If you run 4 tabs you can use the outter right to adjust the attitude in the corners.

I'm with Phil, my little SP20 will turn full bore but in the marbles of a heat it's better to plant it with a little throttle (just like our hydros years ago).

I've tried a small fin out on the RHS when I saw David Preusse running one years ago, seemed to work but adjusting the attitude with a tab is more precise.

I think it lays right over in the turn until the bottom RHS is flat on the water...

INTERESTING on the flat on the right bottom..... If this is so, what is the angle of the bottom in relation to the keel and what angle would the boat change on a Seaducer in the turn? Don't we know the angle of the bottom on a Seaducer in relation to the keel?

Have you seen Dick Tyndal's rudder setup on his 20 mono?

Not sure about the Seaducer, but the Speedmaster is about 25* IIRC.

Without tabs I think guys are tuning the corner attitude with rudder kick in or out.

Haven't seen Dick's mono, what's the deal?

 

[Marty Davis]

If you run 4 tabs you can use the outter right to adjust the attitude in the corners.

I'm with Phil, my little SP20 will turn full bore but in the marbles of a heat it's better to plant it with a little throttle (just like our hydros years ago).

I've tried a small fin out on the RHS when I saw David Preusse running one years ago, seemed to work but adjusting the attitude with a tab is more precise.

I think it lays right over in the turn until the bottom RHS is flat on the water...

INTERESTING on the flat on the right bottom..... If this is so, what is the angle of the bottom in relation to the keel and what angle would the boat change on a Seaducer in the turn? Don't we know the angle of the bottom on a Seaducer in relation to the keel?

Have you seen Dick Tyndal's rudder setup on his 20 mono?

Not sure about the Seaducer, but the Speedmaster is about 25* IIRC.

Without tabs I think guys are tuning the corner attitude with rudder kick in or out.

Haven't seen Dick's mono, what's the deal?

His rudder assy is mounted on the transom at a fairly sharp angle. Maybe he can chime in on this. Seems to work realy well.

 

[Joe Warren]

If you run 4 tabs you can use the outter right to adjust the attitude in the corners.

I'm with Phil, my little SP20 will turn full bore but in the marbles of a heat it's better to plant it with a little throttle (just like our hydros years ago).

I've tried a small fin out on the RHS when I saw David Preusse running one years ago, seemed to work but adjusting the attitude with a tab is more precise.

I think it lays right over in the turn until the bottom RHS is flat on the water...

INTERESTING on the flat on the right bottom..... If this is so, what is the angle of the bottom in relation to the keel and what angle would the boat change on a Seaducer in the turn? Don't we know the angle of the bottom on a Seaducer in relation to the keel?

Have you seen Dick Tyndal's rudder setup on his 20 mono?

Not sure about the Seaducer, but the Speedmaster is about 25* IIRC.

Without tabs I think guys are tuning the corner attitude with rudder kick in or out.

Haven't seen Dick's mono, what's the deal?

His rudder assy is mounted on the transom at a fairly sharp angle. Maybe he can chime in on this. Seems to work realy well.

Hold the boat up straight & see the Rudder is Straight also. Now let the boat lay on its Right side on a flat surface & see what happens to the rudder blade. Some boaters would try to counter this rudder angle change by running angle in the rudder. We have much better boats & hulls than when this would fix a boat.....

 

[Joe Warren]

Just a few years ago the NITRO Mono mfgers that wanted to stay in the hobby were forced to build boats that handled better. AS the hulls changed to surface drive you seen the Pivot points change. Some were for the better some of them missed the boat (No pun intended) after you have spent the money to build a hull mold & fine out your hull does not perform? Many were hanging & changing all types of hardware on the transom trying to bandage the problem.... Chris Fabbro made many changes to the Orginal Microburst & Speedmaster Hulls. He was very paticular as to where he wanted the Pivot point on the hull in Relationship to the CG. This greatly effectly the turnability of the boat @ high speed. These differed from Surface drive to Sub Surface too & the hulls were changing ever other week... I had a chance to buy a few of his Personal NITRO boat hulls. They drove like they were on a rail & were Ballistic Fast..... Today the Seaducer Nitro Mono is the Best Production Hull Money can buy that are Consistantly Great out of the Box. They have had there problem in years earlier designs. But they have made changes to correct most problems....... I have owned the A/C`s & the Microburst & a few others. But for the guy that wants to buy on Monday & race up front on Sat/Sun SEADUCER NITRO Boats are Proven Winners. With just a little extra work they are SUPER.....A/C was onto a huge advantage when they discovered that the strake did not have to be so wide & bulky. A/C streamlined there strakes on the indroduction of the Lazer 40. it was a Big improvement. But the competition was watching & they quickly followed the Performance advantage. It is still fun today to drive a high freeboard boat that runs lose on the water & is fast....... But it may not be the boat you want on Race day!

 

[David vanmaris]

Marty on the subject of props, there is a three blade chopper that Otto and Bill B where running on there 20 mono's that was the cats meow. Sorry I cant remember exactly what it was ,but Im sure someone here does. Never tried one on a Seaducer but would be worth a test if you want something other than an x-series.

Looking forward to seeing you at the pond again.

Andy

ABC 1614/3 chopper mod is a quick prop.

 

[El Zorro]

The B Mono that Marty is speaking of is a 30" long Twincraft that was built new back in January of 1994. This was a new hull made by Steve Speas back then and it would run 49-50 MPH on a good day in heat racing trim with a P5 Picco. Won a few races with it, too. The rudder was angled 10 degrees ( rudder bottom to the right side of the boat ) to help in cornering. The thought here was when the boat leaned to the right in the corner with a vertical rudder it would push the bow of the boat down, causing more drag. The idea of tilting the rudder 10 degrees helped keep the bow of the boat out of the water some, keeping the speed up. Balance point on all of my Twincraft monos was set at 29% and the fuel tank(s) on this boat and my D Mono were mounted on the boats Center of Gravity. Reason for this is that the boat runs the same from the time you throw it in the water until the time you bring it in. Makes it a LOT easier to trim the boat for different water conditions. I retired this boat after last year's Fall Nationals after a third place finish. Seventeen years is a long time to run one boat. Technology passed it by a LONG time ago. If you can find the Mono Mania articles that John Finch did for the IMPBA Roostertail back in the 1990's there is a lot of good information that can help all of us in setting up and dialing in that new mono hull.

Dick Tyndall

 

[shoboat]

Marty,

Believe it or not I have a friend on the west coast running over 70 MPH with

a 1614/3 Chopper. He is an engine wizard, but it is very possible. He has spent

a lot of time on his set up.

Good Luck Testing,

Mark Sholund

 

[Joe Warren]

Marty,

Believe it or not I have a friend on the west coast running over 70 MPH with

a 1614/3 Chopper. He is an engine wizard, but it is very possible. He has spent

a lot of time on his set up.

Good Luck Testing,

Mark Sholund

What boat hull?

 

[BigChuck]

I have seen and driven the "TwinCraft" info the El Zorro talks of. It was good. But when a guy with a OS 81 in a 42 in boat turns under what you "thought" was a tight turn.

As for 70 in a 20 mono. I would have to see it. Not doubting it. If any one remembers Bill McGraw's 20 mono's. I would like to see a 70 Mph....

 

[shoboat]

Joe,

It is a modified Seaducer 21 believe it or not.

Thanks,

Mark Sholund

 

[Scott Schneider]

Marty,

Believe it or not I have a friend on the west coast running over 70 MPH with

a 1614/3 Chopper. He is an engine wizard, but it is very possible. He has spent

a lot of time on his set up.

Good Luck Testing,

Mark Sholund

What boat hull?

Ah YES ! .... Mr Wilsons little Seaducer / Mac 21 combo.

Never witnessed a more stable flat out ballistic little blue water dart as that one

Yes, tested, tested some more and then tested even more.

Last good talk I had with Jim he was telling me that he had something like over 30 gallons of fuel run threw it working out the details getting it to run like it does.

It is just totally a mind blowing .21 mono that would out run most .21 riggers of just a few years ago.

 

[El Zorro]

Being as this thread is about .21 powered monos and how to go around corners better, I knew it was only a matter of time before someone made a claim of a very fast boat. While I do not doubt that this claim of a 70 MPH boat is true, what I want to see is if it can go around corners at this speed. John Finch and Kentley Porter hold the IMPBA SAW record set more than 3 years ago at 73.505 mph. I have seen this boat and I have seen seen what it takes to go this fast and a boat that is trimmed to go this fast is NOT going to go fast around corners. Put this 70 MPH boat out on the race course with 6 or 7 other boats for a 6 lap race and see who finishes first ( and who doesn't finish ). Unless someone has had a major breakthrough in boat design and is much smarter than the two gentlemen previously mentioned above, my hat's off to him..............

Sounds like Mr. Wilson needs to go to some Record Trials to show everyone who the "Big Dog" is in B Mono.

Dick Tyndall

 

[aaron alberico]

Jim

went to the NAMBA record trials and set new 21 mono record

see link post 18

My link

Congrats to Jim

regards Aaron

 

[Luca Gray]

So if Jim Wilson is running 70mph with his 21 mono in race trim,

how come he only went 58mph+ at the record trials,

where the condition's not right

cheers Luca

 

[Joe Warren]

I have personally seen 64 on a radar gun for a 20 mono But nothing higher.... & the bottom of the boat had a ton of work done on it. Several hrs spent filing & sharpening the strakes front to rear.Super Strong Engine & pipe combo that tooks months & a very special X series prop.