Sanshandaobojue's airboat building 2017

A general, non-powerplant specific, discussion on airboat technology, ie., hulls, rigging, polymer, etc..
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Whitebear
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Re: Sanshandaobojue's airboat building 2017

Postby Whitebear » Tue Jan 30, 2018 12:15 pm

Since that shaft will have the prop on one end, did you design in a thrust bearing. It is critical to prevent bearing failure.

Everything is looking good so far man.
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Re: Sanshandaobojue's airboat building 2017

Postby sanshandaobojue » Tue Jan 30, 2018 10:03 pm

pipedog wrote:Looks great Benjamin, you sure do have use of some NICE equipment!!

Thanks, which I want to make a funny/perfect quality airboat for my 5 years son. Mr son known me as a very good naval architect, that's my promise to him I will built a special boat, big toy to him. Then I remember I should built an airboat, most of Chinese people have never seen/heard an airboat.Another 2 friends heard my plan, they are interest in to join, if possible, why not became a business to sell the airboat on China market? So that's all the story until now.

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Re: Sanshandaobojue's airboat building 2017

Postby sanshandaobojue » Tue Jan 30, 2018 10:10 pm

Whitebear wrote:Since that shaft will have the prop on one end, did you design in a thrust bearing. It is critical to prevent bearing failure.

Everything is looking good so far man.


Yes, we really found many design mistake during the production of boat, I nearlly everyday go to the workshop after work, to discuss with the workers, improve the design drawing.

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Re: Sanshandaobojue's airboat building 2017

Postby sanshandaobojue » Tue Jan 30, 2018 10:29 pm

Yesterday we meet a problem, the shock absorber's bolt is too short couldn't installed between the engine and faceplate of engine's foundation.
The shock absorber is orignally ordered from engine manufacture, the bolt is only 20mm, but the engine's foundation thickness is 20mm, there is no space to fasten the bolts. same for face plate of the engine's foundation.

IMG_20180121_115333.jpg

Then I discuss with the worker try to found some solution, for example, welding another section of bolt, or remove the bolts, the finnal solution is remove the bolts and installed a rivet bolts like below.
IMG_20180130_151550.jpg
Attachments
IMG_20180130_151556.jpg

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Re: Sanshandaobojue's airboat building 2017

Postby sanshandaobojue » Tue Jan 30, 2018 10:39 pm

The belt reduction box began to assemble.
I forgot to design a hole before laser cutting, so we have to manually cut hole.
IMG_20180130_135635.jpg
IMG_20180130_114335.jpg
IMG_20180130_141106.jpg

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Re: Sanshandaobojue's airboat building 2017

Postby sanshandaobojue » Tue Jan 30, 2018 10:58 pm

Belt tensioner. I have a little proud of this.
IMG_20180130_114657.jpg

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Re: Sanshandaobojue's airboat building 2017

Postby sanshandaobojue » Tue Jan 30, 2018 11:02 pm

After drill and installed rivet bolt on T bar of Hull, the engine was installed.
Then I found another problem, the lub oil is still summer type, I couldn't star the engine. yesterday temp. -10C( 14F) So today afternoon I will buy some winter lub oil and -20 disel to star the engine.
IMG_20180130_160630.jpg
IMG_20180130_162054.jpg

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Re: Sanshandaobojue's airboat building 2017

Postby sanshandaobojue » Fri Feb 09, 2018 3:49 am

Now looks like a airboat. I am so hurry to sailing.
IMG_20180201_160510 (768x1024).jpg


But still need installed the rudder and steering control.
IMG_20180203_105436 (768x1024).jpg
IMG_20180203_114832 (768x1024).jpg

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Re: Sanshandaobojue's airboat building 2017

Postby sanshandaobojue » Fri Feb 09, 2018 3:51 am

Engine first start :P :P :P :P :P :P :P :P

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Re: Sanshandaobojue's airboat building 2017

Postby sanshandaobojue » Fri Feb 09, 2018 3:57 am

It's half way to succesful. still many things/work to do.
Apply the PA6 to the shell plate with glue, and hot air bending the PA6 plate.
IMG_20180205_094626 (1024x768).jpg

IMG_20180204_162031 (768x1024).jpg
.
Finnally with some steel keep pressure over 24 hours.
IMG_20180205_115427 (1024x768).jpg
Last edited by sanshandaobojue on Fri Feb 09, 2018 10:25 pm, edited 1 time in total.

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Re: Sanshandaobojue's airboat building 2017

Postby sanshandaobojue » Fri Feb 09, 2018 3:59 am

Lifting .
IMG_20180208_140406 (768x1024).jpg

Fixed with wheel table, for next test.
IMG_20180208_152802 (1024x768).jpg

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Re: Sanshandaobojue's airboat building 2017

Postby sanshandaobojue » Fri Feb 09, 2018 4:09 am

Next step is to test the design and caculation for bollard pull or called static pull in aero.

The result is very good. over 30kGf.
I also found some problem for reduction gear, and the engine's speed is only 2500rpm, but the maxium speed shall be 3600rpm.and lots of black smoke, that's means the propeller is too heavy, the engine's torque is not enough to increase the speed of propeller. I should recheck the caculation and make a new reduction rate. So the engine can output full capacity of power 10.5hp at 3600rpm, hopely I can get 50kgf= 490N=110lbf after modification.

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Re: Sanshandaobojue's airboat building 2017

Postby Gary S » Fri Feb 09, 2018 9:00 am

you could ride it round the shop on the table under it. First rule of starting airboat is to make sure everything is clear.

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Re: Sanshandaobojue's airboat building 2017

Postby bkmail » Fri Feb 09, 2018 12:13 pm

How thick is the PA6 you are applying?
Is it UHMW or ?

Are you going to produce many of them?
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Re: Sanshandaobojue's airboat building 2017

Postby sanshandaobojue » Fri Feb 09, 2018 10:55 pm

bkmail wrote:How thick is the PA6 you are applying?
Is it UHMW or ?

Are you going to produce many of them?
Thanks,Bk


It is PA6, very traditional material, very cheap, because it is free to me, I get 3 piece of PA6 size 1*2m, thickness 3mm. UhMWPE will be better on performance, and I have a special glue for PA6 and aluminium, I don't know what will happen for UHMWPE. I will try on UHMWPE on next boat.

Until now, the airboat is for me and my friends private use, there is no bussiness plan. The plan is only built 3 mini airboat, and 2 bigger airboat with power>200HP. And I am not very confidence with my design, it depends on the final perforamce for this mini airboat. But if more friends and people interesting in airboat, maybe I will produce more, and I am not experienced airboat designer, so I will try to contact some USA airboat manufacture as an agent or joint bussiness. Anyway China market is huge, and until now, there is no airboat in the market.

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Re: Sanshandaobojue's airboat building 2017

Postby sanshandaobojue » Fri Feb 09, 2018 11:15 pm

Gary S wrote:you could ride it round the shop on the table under it. First rule of starting airboat is to make sure everything is clear.

It's cold here, but there is no snow on the road. There is no water in the lake,only ice, and I don't have a trailer for a distance between workshop to the lake. So I am waiting for a big snow. Today I am plan to design and make a trailer for the airboat.
Last edited by sanshandaobojue on Sun Feb 11, 2018 11:47 pm, edited 1 time in total.

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Re: Sanshandaobojue's airboat building 2017

Postby Gary S » Sat Feb 10, 2018 7:42 am

Judging by what you have posted, I'm sure it will be first class.

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Re: Sanshandaobojue's airboat building 2017

Postby sanshandaobojue » Sun Feb 11, 2018 11:48 pm

Gary S wrote:Judging by what you have posted, I'm sure it will be first class.

I hope so, and thanks to all the buddy helps me.

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Re: Sanshandaobojue's airboat building 2017

Postby pipedog » Tue Feb 13, 2018 7:53 pm

Looks good!! you putting a seat stand for one person or two?
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Re: Sanshandaobojue's airboat building 2017

Postby sanshandaobojue » Fri Feb 16, 2018 7:49 am

2 seats, position not fix yet, will fix after seatrial, because the position of human body will affect the pitch of airboat, I hope the boat runs at horizontally.


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