JAE21, Wow!!

[dwilfong]

David,

I will pass along you compliments to the photographer!

I'm not sure what the particular shot I linked to shows in relation to the rooster tail. Looking at the wakes made by the left sponson the water is also curving upward, essentially a wave. Now it does seem (not confirmed) that the rear sponson stays on the water, so that the wake from the rear sponson may just be a continuous version of what is seen for the front sponson. Of course evidence of prop blade strikes in this wake can also be seen in other shots, but it seems to me that the wake seen may be the result of both the rear sponson and prop. It would be interesting to get a prop only wake, that should be possible from something like a cat running the prop as surface drive with no skeg on the strut.

Yes it is hard to tell if it is just the curl from the ski with prop marks in it. a side shot would be great on full plain going strait.

There was a small clip of a prop running floating around and it can also be seen in that shot.

David

 

[Charles Perdue]

Ian,

I love the quality of the photos and the "forensic analysis", I think you owe your photographer a beer or two

Ian, I love those photos, what kind of camera and lenses was your friend using?

Charles

 

[Ian Inverarity]

Charles,

The camera is a Nikon D300, the lens is a 70-200VR F2.8, not a cheap combo!!

 

[XtremeRcBoats]

Finally got to run my JAE21 and now I can also say WOW

http://www.youtube.com/watch?v=S7CqWC5jBpE&feature=player_embedded

I bought is used and it came with a NR T21-&M and a MAC pipe. What pipe do you recommend for the engine?

 

[Ian Inverarity]

Paul,

Looks good! I use a SPP RS21 pipe.

Ian.

 

[XtremeRcBoats]

thanks Ian, what aluminum pipe would you recommend. I need an aluminum pipe because I need to add a muffler. We have a 80 dB noise limit overhere.

 

[Ian Inverarity]

Paul,

I havent tried an aluminium pipe on mine, I tend to run pipes of my own design! So I cant give you a recommendation based on my own experience. However many on IW seem to like the Cooper S pipe on the Novarossi's, so that would seem to be a good place to start.

 

[XtremeRcBoats]

Hi Ian,

thanks for the help. I'll have a look at it.

 

[Ian Inverarity]

I have a Novarossi 21DD in my boat now, runs pretty well. And new sponsons built by Andrew "Boom" Tuckwell, thanks mate!

Pic: https://www.intlwaters.com/gallery/displayimage.php?album=1132&pos=12

Video from the 2014 Australian National Championships:

 

[Glenn Quarles]

That is nice Ian! Your DD sounds great!

GQ

 

[Grimracer]

nice run

 

[Ian Inverarity]

Glenn, thanks for the engine, when I worked out what it liked it has gone very well, best 21 engine I have run!

Mike, thanks!

I ran a faster heat but it isn't on video.

 

[Slideblues]

Holy smoke Ian that was burning up tha water Buddy !

Well Done,

Gene

 

[Tim_Duggan]

What Ian didn't say was he set the fastest heat time for the entire event with that boat. So it was faster than twins, faster than the 45's, the 67's and everything else over 5 racing laps. That's 1500 meters with 10 turns in 58 seconds.

Great job Ian!

 

[Craig Murphy]

Nice Ian, good to see the hard work paying off....

 

[mike walker]

Awesome run, nice job

 

[anthony_marquart]

pretty well? It runs insane!!! I remember when people said a rigger without chine angle or none trip would ever heat race well..

fantastic driving too... inspiring me to get back to my boats!

 

[Ian Inverarity]

Thanks guys, a bit of work to get to this point, and a bit of help from Aaron, Tim D, Boom.

Still more work to go tho!

I remember when people said a rigger without chine angle or none trip would ever heat race well..

Anthony, it works due to the turn fin, if the turn fin allowed the boat to slide more it would probably trip in turns. The bigger and heavier the boat is and the rougher the water the harder it is to get a turn fin to hold well enough for that, but it can be done. The lack of non-trips, dihedral etc reduces the amount of water the sponsons try to push sideways, which reduces drag.

 

[anthony_marquart]

I was being a bit sarcastic..I totally understand and build my own designs the same way,

 

[Ian Inverarity]

At the recent SAW event in Australia I removed the turn fin from the JAE, ran one of Aaron Alberico's props (not even a proper SAW prop) and managed to raise the Aus record to about 142kph (approx 88mph). Not too bad for a race boat!

Thanks to Aaron for a lend of the prop and guidance in driving SAW.