flying SIB

António · Post by **António** » 21 Jul 2019, 07:30

hello guys, long time no see... ;)

well, have came to a situation funny at least, I have a flying SIB, yes...

have an 380 ocean bay (china boat) with a 15hp 4st suzuki, and four of us usually came on board.

the thing is that at wot I'm almost lose control of the SIB beacause it take of the water plane.

perfect balanced, third hole trimm, 1/4 of throttle and we already are on plane, and the thing his that we came literaly of water.

to control it have to reduce to 3/4, on flat water, or on choped water, like today.

any help in solution this...

YouTube · Post by **Martin** » 27 Jul 2019, 06:14

Hi Antonio,
Many of us on here will purposely go wave jumping and I assume that’s what you are doing....?

SIBs are so light in weight, a good turn of speed and the right wave angle will launch your sub out of the water, it’s fun - it if it’s something you don’t want, you’ll just have to keep the rpm/speed down a bit.

Out of curiosity, when you say it jumps with four occupants, what weight would you estimate that to be ?

Martin

gratemaker · Post by **gratemaker** » 27 Jul 2019, 15:19

Hi folks, i have got the opposite problem i cant get my Honvave on the plane,i have seen loads of vids on youtube of the same boat and same engine and they seem to plane no problem, i know this sounds a bit drastic but i am thinking about cutting 2 inches of the transum any thoughts would be welcome.

Post by **ChrisParish** » 27 Jul 2019, 16:43

What happens when you try and plane. Does the engine rev up and you don’t go anywhere?

YouTube · Post by **Martin** » 28 Jul 2019, 08:43

gratemaker wrote: ↑
27 Jul 2019, 15:19
Hi folks, i have got the opposite problem i cant get my Honvave on the plane,i have seen loads of vids on youtube of the same boat and same engine and they seem to plane no problem, i know this sounds a bit drastic but i am thinking about cutting 2 inches of the transum any thoughts would be welcome.

Can you advise what model your boat is please? (I
I looked on your profile but couldn't see it, my mind is failing me these days with who has what.... Poss a T38 ?
I certainly wouldn't be cutting anything of any transom

Martin

gratemaker · Post by **gratemaker** » 28 Jul 2019, 13:00

Hi guys, yes Chris that is what is happening and Martin its a brand new Honwave t38 and a 9.9 4 stroke short shaft Yamaha, i am going on my holidays today and was looking forward to taking it with me but i was so peed of with the it last week i am going to take my bris kaboat and my 5hp engine as i think it will be more fun awra best Harry.

Post by **ChrisParish** » 28 Jul 2019, 15:14

That sounds like the classic problem we see with the T38. You need to trim the engine in to the first hole (the trim pin need to be as close to the transom as you can get). Also ensure that your floor is fully inflated.

António · Post by **António** » 29 Jul 2019, 20:47

Hello
some videos from our sunday trip and photos...
regarding the weight, us four, food and drink and safety gear more or less 300 kg...

Post by **ChrisParish** » 31 Jul 2019, 06:40

I like the videos, it looks really nice where you are (20s in on the first video, anyway)
You seem to have got a pretty good setup there.

António · Post by **António** » 31 Jul 2019, 16:12

Tks,

here a picture of the afternoon journey.

the Sétubal bay, as two faces, an industrial and a magical, the one that you see on the video.

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