Here's my take on the latest outrigger buzz - the "jap" style of hydroplanes. I call mine "Yap's 21". It's based on 21-sized drawings from Rod Geraghty but its slightly changed. I have only tested it briefly and it's in by no means up to speed or race ready. But even though I was breaking in the new O'Donnell SS21 engine in it, it still was plenty fast by Swedish standards at the latest nats in Eksjö.
The general performance of my boat was that it runs really, really light on the water. Actually a little too light on the front sponsons especially in race conditions. But with that said, it never flipped over even though the sponsons where WAY out of the water wobbling etc. A Kep's 21 would have been up-side-down long time ago if it would be set-up that loose. :)
(Update October 5: I just realized that when testing it I had it set-up completely wrong. The AoA of the tub was at an too steep angle making it run too light in the front. The sponson tubes where about 2 mm to low in the tub! Oops. And its too cold here now to test it with the right set-up...)
Do note - this will never be an freebie drawing from me. I will leave that to the JAE team and I'll upload their JAE .21 drawing (and the other JAE drawings also later on) if that/they come available.
So the pics below is mainly to get you inspired for building a rigger yourself and in particular a "JAE" style one of course! Have fun building!
HERE's the info of the JAE .12G kit available from ZippKits.
Wanna build a JAE .12G (formely known as JAP .12G) from a freebie drawing? If so, klick HERE.
All action pics are by Mattias Kratz.
