Advice for buildin aluminium hull.

Airboats with smaller powerplants.
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M0RYAK
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Re: Advice for buildin aluminium hull.

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Guys I have idea to change my present engine on another from motorcycle Suzuki GSXR Hayabusa. It will give 197 HP. And I want use the two blade prop 72" Q series.
How do you think it is possible?
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M0RYAK
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Re: Advice for buildin aluminium hull.

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A few video reports from pre last hanting.

https://youtu.be/IoTTlFAvT6Q

https://youtu.be/WdO9ZW7CDds
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M0RYAK
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Re: Advice for buildin aluminium hull.

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Last voyage video reports.

Using the transom plate 10" x 8". Speed 35 mph.
https://youtu.be/AUsjyMU1A4A

During run with 2nd gear ratios was stopped by dry ground, after shift to 1st gear ratios have been possible run again.
https://youtu.be/BuUsV5bUseg
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Slidin Gator
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Re: Advise for buildin aluminium hull.

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That’s Airboat marsh for sure, stay out of the DeepWater.
I still think I-10 is the Mason Dixon line.
2013 Mike Stossel Boats, 13' x 7' deck over, IO-540, 74" NGQ less winglets.

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M0RYAK
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Re: Advice for buildin aluminium hull.

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Slidin Gator wrote:
Tue Dec 03, 2019 8:27 pm
That’s Airboat marsh for sure, stay out of the DeepWater.
I can't possible avoid the deepwater it is first part of my way (50 %). Every time running about 65 miles.

After lonely voyage I found 70 litres of fuel consumption.

Quvestion: When I will have minimum fuel consamption?

1. the throttle opening 50% rpm 7500.

2. the throttle opening 75% rpm 5500.

3. the throttle opening 100 % rpm 4200.

The speed and prop rpm is the same. Different of the gear ratios.
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Slidin Gator
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Re: Advise for buildin aluminium hull.

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I would think second gear would give the best fuel consumption on the long run, but you are Better suited to test it out and tell us. That’s a common point of discussion and disagreement on this forum.

3rd gear appears possibly useful for off plane idling if you do much of that for bow fishing etc.
I still think I-10 is the Mason Dixon line.
2013 Mike Stossel Boats, 13' x 7' deck over, IO-540, 74" NGQ less winglets.

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M0RYAK
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Re: Advice for buildin aluminium hull.

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Slidin Gator wrote:
Wed Dec 04, 2019 9:28 am
I would think second gear would give the best fuel consumption on the long run, but you are Better suited to test it out and tell us. That’s a common point of discussion and disagreement on this forum.

3rd gear appears possibly useful for off plane idling if you do much of that for bow fishing etc.
It look like Torque and HP!

Ok. I think too. The 2nd gear more good.
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Re: Advice for buildin aluminium hull.

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Next video.

I used second gear ratio. Stopped for rise of the transom plate.
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Re: Advise for buildin aluminium hull.

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Appears Ivan is learning to sit down :violent1: this ain't no motor boat, get rid of that push pole and let the engine do the work. The boat sure seems to respond in 2nd gear on water. You will loose some of that with a 2 blade, but 1st gear should bring it right back and then some. I see she started proposing after you raised the trim tab (transom plate). You should either search hull jacks on this forum or invest in a hydraulic trim tab system, I recommend the first option, I'll sell you the second. :thumbleft:
I still think I-10 is the Mason Dixon line.
2013 Mike Stossel Boats, 13' x 7' deck over, IO-540, 74" NGQ less winglets.

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M0RYAK
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Re: Advise for buildin aluminium hull.

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I am very glad to see your remarks. Befor airboat I used motor boat and push by pole was usualy operation.

It's look like good decision using remote control of gear box.

I have intention to make electric trim tab with switch.

But before trim tab, I want to try tune of the engine angle again.

I think my hull have little bit short flat bottom. I have idea for far future try to increase length of flat bottom by 1 feet. I can use for it trial plate with width like flat bottom.

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Re: Advise for buildin aluminium hull.

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Last videos.

Stopped for shift of gear ratio to 1st. And rise of the transom plate.
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Re: Advise for buildin aluminium hull.

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M0RYAK wrote:
Thu Dec 05, 2019 2:34 am
But before trim tab, I want to try tune of the engine angle again.

I think my hull have little bit short flat bottom. I have idea for far future try to increase length of flat bottom by 1 feet. I can use for it trial plate with width like flat bottom.
Do not do this, it is a bad idea, from your video I see you have already found the primary issue with trim tabs. Again, research hull jacks on this site.
I still think I-10 is the Mason Dixon line.
2013 Mike Stossel Boats, 13' x 7' deck over, IO-540, 74" NGQ less winglets.

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Re: Advice for buildin aluminium hull.

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Ok! Noted.
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Re: Advise for buildin aluminium hull.

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It is fine to adjust the engine angle, just don’t add a big plate to the stern. You should be able to sort it all out by tweaking the hull, prop/engine angle and weight distribution.
I still think I-10 is the Mason Dixon line.
2013 Mike Stossel Boats, 13' x 7' deck over, IO-540, 74" NGQ less winglets.

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M0RYAK
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Re: Advice for buildin aluminium hull.

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Slidin Gator wrote:
Fri Dec 06, 2019 5:27 pm
It is fine to adjust the engine angle, just don’t add a big plate to the stern. You should be able to sort it all out by tweaking the hull, prop/engine angle and weight distribution.
It is right remarks. I just feel that I had mistake with a hull size.
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Re: Advice for buildin aluminium hull.

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There are two beams that are welded to the stringers. For lowering of rear part the engine I will removing welding and move ahead each beam about 4 ". Additionally it give me possibilities use hull jack (if I will not welded center stringers). How many stringers should be free?
Distance between stringers 7".
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Re: Advise for buildin aluminium hull.

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Off course for first I will try to tune the engine engle.

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Slidin Gator
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Re: Advise for buildin aluminium hull.

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Moryak,

All I can say is "Holey Crap", you built a stout hull, way more runners (fore/aft T bar) than normal, but she should take a beating. What is the hull thickness?

The major flaw you made is the bracing that your Engine stand is mounted too. I call them bulkheads. You should not have welded the Port/Stbd beams to your runners. If you had bolted connections you could tune your hull.

When you did all that welding, the bottom of the bulkhead beam sucked up, causing the hull to "dome up", making it higher in the center than the edges, giving you the porpoising issue. You want a very little bit of outward balloon on the hull. Too much balloon and she runs on the nose (bow) it does not take much.

I think you need to figure out how to shape what you have, it's gonna take some force and heat. Aluminum is tricky if you are not experienced.
I still think I-10 is the Mason Dixon line.
2013 Mike Stossel Boats, 13' x 7' deck over, IO-540, 74" NGQ less winglets.

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M0RYAK
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Re: Advice for buildin aluminium hull.

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The hull thickness is 2mm. It is reason why I instalsted beams. I wanted have stout hull.

Before any action I would check the bottom with a straight edge or string line.

If I correctly understood your advice use the two t-bars (runners) port and stbd for bolt connection with beams (bulkheads).

I was read many posts at this sait about hop.... I founding information about shifting of engine's stand ahead to 2" give good effect.

I have rear part of stand 7" from transom.
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Re: Advise for buildin aluminium hull.

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Center of hull in stern perhaps 2-4 mm (1/16-1/8”) bubbled out/down vs port/stbd rails is the goal for shape. How you get there is up to you.
I still think I-10 is the Mason Dixon line.
2013 Mike Stossel Boats, 13' x 7' deck over, IO-540, 74" NGQ less winglets.

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M0RYAK
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Re: Advice for buildin aluminium hull.

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Slidin Gator wrote:
Sat Dec 21, 2019 6:40 pm
Center of hull in stern perhaps 2-4 mm (1/16-1/8”) bubbled out/down vs port/stbd rails is the goal for shape. How you get there is up to you.
Good! Noted.

If possible provide inforrmation about distance from transome to rear part of stand on your airboat.

Thanks!

P.S. 2 mm is so small that I could lose attention during construction.
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Re: Advice for buildin aluminium hull.

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I checked the bottom geometry from inside. There is a "dome up" (about 4-5mm) between bulkheads and before 1st bulkhead.
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Re: Advice for buildin aluminium hull.

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My friends ended the season of duck hunting, week ago.They were very lucky.
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Re: Advice for buildin aluminium hull.

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During the short vacation I had some walking.
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Re: Advice for buildin aluminium hull.

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I made two hull jacks and cut the first bulkhead, but didn't solve the porpoising problem. Perhaps they incorrectly placed. Need to reinstall the first behind the fuel tank or make third. Unfortunately very restricted with time.
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