21 Hydro - HydroShock 21

[tobbec]

Hi Alden

The red and blue boat in the link have gear reduction, the MK II have been tested with gear reduction, but early days yet.

The HydroShock MKI have no gear reduction.

The gear ratio that have been working well for me is around 1:1.6.

Prop in this case around 60mm diameter.

No gear failures yet, I was concerned, but it seems to work great, I think that the flex shaft absorbs most shocks from the prop.

The gear system mostly comes from mono boat endurance racing and it is well proven, if set up properly, it is almost fool proof.

Jorgen

But in the videos here there are no gear ? direct drive i guess ?

 

[Jorgen Andersson]

Yes, in the videos it is direct drive, but I have been up to almost same speeds with the gear reduction.

Jorgen

 

[Chris Wood]

jorgen,

i would think if you could get a gear version up to the same speed there is a great plus with instant torque that you don't have with direct drive? i could be wrong

chris

 

[Jorgen Andersson]

Chris

Yes, the torque is very instant and the hook up with that large diameter prop is fantastic.

You can also run shorter pipe lenghts, and still have good pick up.

The gear boat is about 3-4mph slower at the moment, best pass 74mph, I think most of it is in the prop, a whole new area to explore for a 21, at the moment I use a mod 1860......

Only time could tell.

Thanks

Jorgen

 

[Jorgen Andersson]

Hi

I have found a short video when I run with the gearbox, I will try to post that one tomorrow.

Jorgen

 

[Jorgen Andersson]

Hi

Here is a short video when I run with the gear reduction.

I made some comments under the video on You Tube.



If you have any questions, please ask.

Thanks

Jorgen

 

[Manuel Xavier]

Hi

Here is a short video when I run with the gear reduction.

I made some comments under the video on You Tube.

Hi

What are the ratio you are using?

So far as I reed you already tried a geared eagle .21 with a ratio of 1:1.65 and a prestwich gearbox.

What about to try a lower ratio around 1:1.5 with a very light and low gearbox?

Thanks

Manuel Joao Xavier

 

[Charles Perdue]

Hi

Here is a short video when I run with the gear reduction.

I made some comments under the video on You Tube.

Hello Jorgen, the gear drive looks like a really good heat race setup......

Charles

 

[Tim_Duggan]

Hi Jorgen,

Did you need a longer rudder blade with the gear drive and the larger diameter props?

Tim

 

[Jorgen Andersson]

Hi

Manuel

I have tested with several different ratios, from approx. 1:1.4 to 1:1.8 and when I get below 1:1.5 or so, it seems that you loose some of the good effects in gearing down.

The high mounted engine in that boat did not have any effect what so ever on handling, a bit dissappointing.......I also tested this before I mounted the gear set up, by a lead weight on top the direct drive engine.

Charles

Thanks, yes the hook up with a 57-60mm prop on a 21 hydro is just fantastic and it is also race proven with good results.

This video was taken last year, some improvement in speed since then.

New props are needed to take this to the next level.

Tim

No change was needed to the rudder, I did not feel any difference in that respect.

Thanks

Jorgen

 

[tobbec]

Alright , a hard to answear question.

When tested both gear and no gear, whats to prefer in realy hard thight racing as we have in our champs in Sweden and then in WC ?

Maybe the best way is direct when good conditions in wheater and gear when windy, chopy wheather.. ?

 

[Jorgen Andersson]

Tobbe

Too early days to answer that, nothing is written in stone here.

As we can use a spare boat in our National series and in World Champs, I think both can be very useful......

Jorgen

 

[Jorgen Andersson]

Hello

The interest in a HydroShock kit have been much greater than I ever could imagine.

More than twenty people have made requests and asked for quotes.

I have now started to make four kits, two for myself and the other two for racers I know.

This will be a test how much work that it is involved.

If this works out well, and that development continues during 2011, I will take into consideration to make some more kits during the next winter.

In these four kits, there will be no wood at all, only carbon fibre and Divinycell/Airex.

Thanks

Jorgen

 

[tobbec]

Hello

The interest in a HydroShock kit have been much greater than I ever could imagine.

More than twenty people have made requests and asked for quotes.

I have now started to make four kits, two for myself and the other two for racers I know.

This will be a test how much work that it is involved.

If this works out well, and that development continues during 2011, I will take into consideration to make some more kits during the next winter.

In these four kits, there will be no wood at all, only carbon fibre and Divinycell/Airex.

Thanks

Jorgen

Cool, let hope its a winner then at the races..

 

[Jorgen Andersson]

Tobbec

That´s the plan!

Jorgen

 

[Jorgen Andersson]

New photo and some info.

http://www.intlwaters.com/index.php?app=gallery&module=images&section=viewimage&img=6768

Jorgen

 

[Jorgen Andersson]

I got several PM´s about this boat and the racing i Japan.

I have done some research and got really good info and feedback from some of the racers in Japan.

Here is a short intro to how they race:

In Japan, you have two different type of racing, one is a short track, each lap is 100m.

You drive one at the time, against the clock for four laps, best time wins.

This has been around as the Japanese championships since 1966.

1966 was the winning time 1.02min, 2009 was the best time of 17:06 sec!!

The second track is similar to ours, a little shorter straights 82 meters, and a bit tighter corners, 6m radius compared to Naviga 10m. They run six boats in each heat and have the same points system as we have. This class ran its first Japanese championship in 1984.

The classes they run are 3.5, 7.5 and 15cc, both Hydro and Mono.

In this year's Japanese championships, it was 77 boats in the short course and 92 boats in heat racing classes.

My red boat belongs to the latter category and is designed to race with other boats, and can handle rough water well, since they often run in bigger lakes.

Jorgen

 

[Richard Dahlheimer]

I got several PM´s about this boat and the racing i Japan.

I have done some research and got really good info and feedback from some of the racers in Japan.

Here is a short intro to how they race:

In Japan, you have two different type of racing, one is a short track, each lap is 100m.

You drive one at the time, against the clock for four laps, best time wins.

This has been around as the Japanese championships since 1966.

1966 was the winning time 1.02min, 2009 was the best time of 17:06 sec!!

The second track is similar to ours, a little shorter straights 82 meters, and a bit tighter corners, 6m radius compared to Naviga 10m. They run six boats in each heat and have the same points system as we have. This class ran its first Japanese championship in 1984.

The classes they run are 3.5, 7.5 and 15cc, both Hydro and Mono.

Hello Jorgen, are you using the RSV07 drum housing, or the MAC/CMB green head housing? Do you have to use different clearence with the peek drum valve, compared to the stock valve? Thanks, Richard

In this year's Japanese championships, it was 77 boats in the short course and 92 boats in heat racing classes.

My red boat belongs to the latter category and is designed to race with other boats, and can handle rough water well, since they often run in bigger lakes.

Jorgen

 

[Richard Dahlheimer]

Hello Jorgen, which drum housing are you using on the RSV07 engine? Do you think there is a performance advantage with the lighter weight peek drum valve? Thanks, Richard

 

[JRXHydros]

Hello Jorgen,

My name is Joel......I like that red & white 21 hydro picture you posted.....are you going to template the hydro for building? I sure would like a set of plans off that rigger. Nice job Jorgen on reporting this great information from Japan...you do great work!

Thanks,

Joel