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« Reply #25 on: July 16, 2015, 12:35:54 PM »
ashok baijal
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A coat of ncputty applied and sanded. Next would be a touchup with the putty on areas which are still rough.

I need advice on the paint to be used. Can fevicryl paint be used on an air boat or regular thinner based paint has to be used? Further can regular thinner based paint be sprayed using an airbrush or will it get clogged? Any suggestions for a colour scheme?

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Re: 6th Sweepstakes - Everglades Air Boat
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« Reply #26 on: July 16, 2015, 12:39:29 PM »
sundaram
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That's coming out real Nice sir.

How I wish I had one such boat in Jalandhar to try here.

https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-xat1/v/t1.0-9/11329787_485078478335405_8519942047195069150_n.jpg?oh=4fc26124394f62d27e50d902fe90aca6&oe=561878A1&__gda__=1448311678_b3b37c21283f76728e09e22f9ccc2581
6th Sweepstakes - Everglades Air Boat
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« Reply #27 on: July 16, 2015, 12:43:17 PM »
ashok baijal
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@Sundram.
Col I need your advice on a suitable paint for the boat. I would like to inaugurate my airbrush
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« Reply #28 on: July 16, 2015, 12:53:52 PM »
sanjayrai55
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As there is no fuel, go ahead and use auto refinish paint (NC Paint)

Keep good visibility in your colours: though boats generally don't go as far away as planes, water spray makes white difficult to see
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« Reply #29 on: July 16, 2015, 01:06:21 PM »
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Since it is going to be used on water I would suggest Automotive Urethanes / NC Lacquers to make paint water safe which can both be used in airbrush with thinner.

Care however should be taken to clean and rinse airbrush thoroughly immediately after use with thinner.

I would have recommended one more cheaper alternative of Craft fevicryl Ceramic Paints which also makes a hard water proof coat but only after a heat treatment with a heat gun. Since you have used Foam inside the structure before glassing I would not recommend it now. Fabric Acrylics are also not recommended for the same reason of requirement of heat treatment to make it water proof.

If use of airbrush is not compulsory I would recommend automotive paint spray cans available readily in all colours, even in metallic colours now a days for Rs 120-150 a can. which is a no fuss easy to use in this case. you may need not more than a can or a colour each to maintain the colour scheme.

All the best sir.
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« Reply #30 on: July 23, 2015, 04:31:12 PM »
ashok baijal
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After fibreglassing the hull gave a base coat of white paint. Bought two spray cans of yellow and red for final coat. Waiting for base coat to dry - next some filling of irregular spots, sanding and then final painting. And then, a taste of water.

1437632435709-31086282.jpg
Re: 6th Sweepstakes - Everglades Air Boat
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« Reply #31 on: July 26, 2015, 10:12:34 PM »
ashok baijal
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My son had come today and wanted to try his hand at the boat. So the maiden was done today.his first attempt video. Camera managed by my wife. Only a small part of the run was captured.

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« Reply #32 on: July 27, 2015, 05:28:46 AM »
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Very nice  Thumbs Up

Now for the next video - turn on the juice  >Cheesy
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« Reply #33 on: July 27, 2015, 10:27:15 AM »
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Awesome Sir.  Clap Clap  Cut some stencils and go for some crazy Graphics and Colour schemes.  Thumbs Up

PS: keel lines on the belly would have been great to maintain directional stability. May be five lines of Bamboo Kebab Skewers epoxied on the belly and sanded on the sides to give the lines on the belly would have done the trick.
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« Reply #34 on: July 27, 2015, 11:31:32 AM »
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Thanks Sanjayji and Col. I had thought of putting the keel lines but wanted to try it out before adding them. Will try to add them this week as final painting is still to be done. Scratching my head for a design.
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« Reply #35 on: August 09, 2015, 10:31:02 PM »
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Second Day - Short Clips



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« Reply #36 on: August 09, 2015, 10:56:02 PM »
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@ashok baijal,

An air craft to beat the rain!

Wondering about the following (besides paint scheme)
1. How deep does she ride?
2. Is the waterline parallel to the keel/deck? Should it be? Should she ride a bit nose up?
3. Will she nose down on full power?
4. What should be the attitude at low speed / high speed? Same? Different?
5. What's the relationship between the CG position and motor thrust line.
6. Is a small water rudder desirable? Should it be pivoted at the top, to provide full surface at low speed and less at high speed

Much easier to ask instead of doing the research myself  Grin
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« Reply #37 on: August 10, 2015, 10:43:36 AM »
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Super Nice  Thumbs Up  Clap Clap
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« Reply #38 on: August 10, 2015, 04:17:32 PM »
ashok baijal
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@ Iyer
Your questions - my responses
1. How deep does she ride?  About 1.5cm  Weight 2470 gms, width 31cm, length under water 59cm full length of boat 70cms
2. Is the waterline parallel to the keel/deck? Should it be? Should she ride a bit nose up? It is parallel. Battery can be shifted aft. Can be tried, but as of now she sits and runs parallel to the deck
3. Will she nose down on full power? No, she does not.
4. What should be the attitude at low speed / high speed? Same? Different? The attitude remains the same other than it creating a nice wave at the bow at higher speeds. You can clearly see water rising about 3cm at the bow.
5. What's the relationship between the CG position and motor thrust line. Do you mean that the thrust line should point a bit upwards so that the bow rises at higher power? Yes, this can easily be done by putting a few washers on the upper motor mounts. P
6. Is a small water rudder desirable? Should it be pivoted at the top, to provide full surface at low speed and less at high speed? The turns are smooth and no issue. I did not run it at full power as I was using a 25amp esc and because it was not placed in an open place it was prudent to run at half power to avoid a brownout in the middle of the lake. Will soon be replacing the esc with a car esc with reverse capability for ease in manuverability and heat management as they are supposed to work away from direct airflow.

BTW need your postal address for returning your ESC.
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« Reply #39 on: September 17, 2015, 12:41:47 PM »
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A coat of paint

1442473944404-1872327416.jpg
Re: 6th Sweepstakes - Everglades Air Boat
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« Reply #40 on: September 17, 2015, 02:09:14 PM »
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Re:

Super Sir. That's a beauty.
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« Reply #41 on: September 17, 2015, 03:47:20 PM »
ashok baijal
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Thanks Col. Wife has consented to make two dolls for the driver/pilot (?) and one passenger  Grin
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« Reply #42 on: September 17, 2015, 05:14:39 PM »
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Wow.
Even has non-slip floor mats!
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« Reply #43 on: September 18, 2015, 11:24:33 AM »
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....wow ! I thought this was still WIP. Very nice run  and so easy to turn....the waves look neat too  Grin

Edit: have you tried it at WOT, or is at WOT already?
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« Reply #44 on: September 18, 2015, 01:36:24 PM »
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Thanks Iyer and Bmblb. By the way what is WOT? Recently I have installed a car ESC as it has a small cooling fan and can move forward and reverse. I have still to go out to the lake to test the new setup. Will update once I go.

Edit. The throttle was around 50% most of the time.
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« Reply #45 on: September 18, 2015, 02:18:13 PM »
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Сумасшедший об авиации



WOT- Wide Open Throttle
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