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2nd Build: Outrigger Airboat

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Old 04-05-2014, 07:52 AM
  #126
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Making more progress. Just a few bits left and it's fiberglass time.
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Old 04-05-2014, 12:50 PM
  #127
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Looking good. Keep at it.
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Old 04-07-2014, 07:27 PM
  #128
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Nicely done, looking good, eager to see the end result and ultimately the water test. I was planning on posting my build soon but there doesn't seem to be a lot of interest in what we're doing or is it just the dead time of year?
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Old 04-07-2014, 10:37 PM
  #129
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Nicely done, looking good, eager to see the end result and ultimately the water test. I was planning on posting my build soon but there doesn't seem to be a lot of interest in what we're doing or is it just the dead time of year?
It's the time of year, and I think the usage of RCU Is down since the software upgrade happened.
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Old 04-13-2014, 10:04 AM
  #130
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How's the fiberglass coming along? What oz cloth have you used on the boat?
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Old 04-13-2014, 12:58 PM
  #131
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How's the fiberglass coming along? What oz cloth have you used on the boat?
I am hoping to get some resin down tonight. I have had a lot of trim to do which I just finished this morning. I have to sand the nose of both sponsons a little otherwise they're ready. To save weight I think I'll just use 3/4oz cloth and 2 coats of epoxy resin. On top of that will be a water based polyurethane which dries to a really slick surface. I didn't fiberglass the tub originally, but I did put a fair bit of resin on the inside of the tub though. I ended up with about 15 coats of polyurethane on the tub and that held up well in my failed voyages. I'll get some new pics of the before and after resin coat to show why it took so long to make these things.

RTR weight finished of old sponsons is 510g, new sponsons sans epoxy and cloth is 387g. I'm quite happy with that, although the final finished weight of the new ones will be roughly 100g lighter. That's a good 20% weight savings.
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Old 04-13-2014, 02:14 PM
  #132
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20 % is a good saving for sure, every once counts in the end! 15 coats of polyurethane that probably added some weight, did you happen to get a before and after weight during the process? I still haven't decided on what finish to use on mine so just curious.
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Old 04-13-2014, 03:55 PM
  #133
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20 % is a good saving for sure, every once counts in the end! 15 coats of polyurethane that probably added some weight, did you happen to get a before and after weight during the process? I still haven't decided on what finish to use on mine so just curious.
Epoxy will add a significant amount of strength as well as fuel/water resistance. That's my first choice, and do 2 coats minimum. Second choice would be oil based polyurethane or varnish. The epoxy and oil based poly will penetrate the wood deep and seal it better than any water based product can do. My outrigger was originally oil stain and water based poly on top.
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Old 04-14-2014, 03:09 AM
  #134
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Here's some before and after photos.
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Old 04-14-2014, 03:01 PM
  #135
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I'll have to see what products are available here in Canada now it is very difficult to get anything oil based these days. Those are looking pretty good, you must be getting close to a water test?
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Old 04-14-2014, 04:16 PM
  #136
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I'll have to see what products are available here in Canada now it is very difficult to get anything oil based these days. Those are looking pretty good, you must be getting close to a water test?
As soon as I get 2 coats of resin on I will test it in the bath tub. I still have to rig the servos and linkages back up, shorten the boom tubes, and get the engine mount fixed. I would like to have as much gear on the hull as possible for the water test so it's accurate enough to know if it's gonna sit high enough or not.

You should be able to get Epoxy. I use Pacer Z-Poxy finishing resin PT-40. It's thin, spreads well, and sets hard as all get out. I use this resin by itself and with cloth. Works well for me.
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Old 04-15-2014, 07:00 PM
  #137
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Thanks 1QwkSport2.5r looking forward to how it sits in the water now with the new sponsons. The Pacer Z-Poxy finishing resin is what I use for all my fiberglassing on anything rc related and I have some models over ten years old and not so much as a crack, fantastic product to work with. The Z-Poxy is only available in select locations now so it looks like more trips across the border may become a necessity in the future.
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Old 04-16-2014, 03:48 AM
  #138
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Quote:
Originally Posted by arcdude View Post
Thanks 1QwkSport2.5r looking forward to how it sits in the water now with the new sponsons. The Pacer Z-Poxy finishing resin is what I use for all my fiberglassing on anything rc related and I have some models over ten years old and not so much as a crack, fantastic product to work with. The Z-Poxy is only available in select locations now so it looks like more trips across the border may become a necessity in the future.
I have a feeling I'll need to use a launch ramp to get it on plane but once on plane it should stay up. I think I'll either use a TT .46 on a tuned muffler or a Super Tigre G51 on the same muffler. It will depend on what engine turns the prop faster. My Jett .35 is as strong or stronger than the TT, so if I need that much more power another Jett will be needed. But time will tell.


Is it much of a hassle to just have it shipped to your door? I know parcels going internationally have to go through customs, but epoxy isn't hazardous as packaged.

The first time I used the Pacer finish resin I mixed up like 2 ounces or something (1oz each) and the mixture exothermed in the cup and almost caught it on fire.. I learned to keep it moving (roll the cup every so often) or in larger quantities I dump it on a stiff paper plate.
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Old 04-16-2014, 07:06 PM
  #139
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Quote:
Originally Posted by 1QwkSport2.5r View Post
I have a feeling I'll need to use a launch ramp to get it on plane but once on plane it should stay up. I think I'll either use a TT .46 on a tuned muffler or a Super Tigre G51 on the same muffler. It will depend on what engine turns the prop faster. My Jett .35 is as strong or stronger than the TT, so if I need that much more power another Jett will be needed. But time will tell.


Is it much of a hassle to just have it shipped to your door? I know parcels going internationally have to go through customs, but epoxy isn't hazardous as packaged.

The first time I used the Pacer finish resin I mixed up like 2 ounces or something (1oz each) and the mixture exothermed in the cup and almost caught it on fire.. I learned to keep it moving (roll the cup every so often) or in larger quantities I dump it on a stiff paper plate.
The shipping is doable as I do order a lot from the states however the shipping costs are absurd, recently I ordered an item for $70. and it cost me $40. shipping. The shipping options aren't always made available. Fortunately I live only an hour drive to the border so if several items are needed it's cheaper to go and get them.

Guess you have a decision to make on the engine choice, might I suggest the lightest with the highest rpm, I can't offer an opinion on the difference between the ST and TT I've only had a TT 46 and was very impressed with it's performance.

I had similar issues with the Z-Poxy going off especially if it is a tight sort of enclosed container so I tend to go a little light on the harder rather than exact equal parts, it just takes a little longer to set up.
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Old 04-17-2014, 02:36 AM
  #140
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Always mix the epoxy at equal parts, just pour it out after mixing onto a paper plate. If the mixture is spread out, the heat buildup dissipates much better and gets you good working time.

I think the ST is the faster engine but it's gonna probably be heavier. The TT is a great engine, I just have to get it to run inverted better.
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Old 04-27-2014, 09:16 AM
  #141
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Adding more photos. Sponsons are done. Started rigging.

New sponsons ended up with 2 coats of Pacer finishing resin (3/4oz cloth on the bottoms) and 6-7 coats of polyurethane to fill in the remaining weave of the cloth. The new ones are 15% lighter than the old ones and should provide much better lift. I hope.
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Old 04-27-2014, 03:49 PM
  #142
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Thought you fell asleep at the helm, looking good, what is the finished weight for the new ones?
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Old 04-27-2014, 05:41 PM
  #143
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Quote:
Originally Posted by arcdude View Post
Thought you fell asleep at the helm, looking good, what is the finished weight for the new ones?
I've been really busy with a sick kid and I've been working a lot lately, so I'd been sneaking a coat in usually when everyone went to bed. I have to get of my test stand and run a couple engines to determine which one I'm going to use. I'll test float it this week sometime I think. Old sponsons were about 250g each, new ones are 214g or so.

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Old 04-29-2014, 12:29 PM
  #144
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Hope the young one is feeling a little better. As you mentioned earlier you may need a launch ramp afterall so even if one engine is a little heavier I don't think it'll matter. Good work on the sponsons.
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Old 04-29-2014, 03:46 PM
  #145
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Hope the young one is feeling a little better. As you mentioned earlier you may need a launch ramp afterall so even if one engine is a little heavier I don't think it'll matter. Good work on the sponsons.
I might get lucky because I positioned the sponsons in such a way so the keels of the sponsons are deeper so hopefully the tub will sit high enough idle that it may plane on its own though I'm not holding my breath. Airboats seem to be faster when they're on the edge of floatation sitting idle. I'll be test floating the boat in the next few days and there will be pictures afterward.
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Old 05-29-2014, 06:26 PM
  #146
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How did the float test go?
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Old 06-07-2014, 05:25 AM
  #147
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How did the float test go?
Never got time, too busy working 50+hrs a week and having a 14mo old toddler running amuck. I may not get time to mess with it until July or any model for that matter. I did get a chance to run the engine on the test bench and all went well so I just need to find time to mount the engine and fuel tank and adjust linkages and bind the receiver. Someday...
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Old 10-02-2014, 07:42 PM
  #148
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She's a chunky pig, but she floats. Still will need to hand launch it or use a ramp.
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Old 10-02-2014, 08:11 PM
  #149
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It appears the back sponson tube is completely under water and the front one is just touching the surface if I'm not mistaken from what I can tell. It does sit a tad low and with the rear tube under water that may be a little too much drag for it to climb up and plane for you. As you state all is not lost and from what I've read hand launching seems to be common practice. Let us know how the water test turns out.
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Old 10-02-2014, 08:53 PM
  #150
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Yeah, I planned on using a ramp anyway. It sits pretty low, but better than the old sponsons. I can shed some weight with some engine stand modifications. I just mocked it up as it was setup originally. If I could get a pound less weight up front it would have a better shot. I'm not very optimistic it's gonna get on plane even with a ramp. I think this thing will end up being all show and no go.
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