MrRcFanatik's Apache boat build! :)

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MrRcFanatik's Apache boat build! :)

Post by MrRcFanatik on Wed May 22, 2013 8:15 am

Hey hey everyone!! I've made some other boats before this one... but this is the LARGEST and most ambitious build I've ever attempted!

So, let me catch you all up to speed!

I started this build in June of 2011.

So I wanted a fiberglass boat. Not wood. Even though I had never fiberglassed in my life, I did my research and thought I'd give it a go! I wanted a boat around 32-36in long and powered by a 2300-3200kv brushless system. The motor/esc of my choice was going to cost about $100 which is perfectly resonable, but I wondered if I could spend that $100 on anything better...

I speculated about using a gas engine of some sorts, but I knew I'd have to make the boat MUCH larger than 32in long... I had no idea until I started modeling HOW BIG this would turn out! It may not be the largest rc boat in the world, but it's almost too big for me to store! And although a brushless system would make the boat faster.. I liked the idea of a gas engine!

I chose to model my boat in 3D... using a program called Google Sketchup. I drew this boat, and scaled it to what I though would be a good size for a gas engine - 42in long.



I was basing the design on two boats in particular... the Aquacraft Rio 51, and the Apache style boats.

WELL! This was a rather rash decision on my part, but I've never looked back... I was searching online when I finally decided to power my boat with an engine from a yard trimmer. I wanted something unique and tough, and a 23cc from an actual "Weed Eater" brand trimmer was NOT going to cut it for me (no pun intended LOL).

Introducing the ultimate reason behind this project: cheers



This my friends, is a 40cc, 4-stroke, 8000RPM, 2hp, 4lb/ft, of torque MONSTER. Yes, you read that correctly, this is a 4-stroke... not 2 as normal. Again, I wanted something unique, and after searching online, I was only able to find TWO other RC boats that used a 4-stroke GAS engine. (As in not nitro... there are some of those)

It's a Briggs and Stratton 21100 series yard trimmer engine that comes on some Sears brand trimmers. I was very lucky and found this one practically brand new (as far as I'm concerned, it WAS brand new) from a Princess Auto near me. $50. Yup. That's half of what I would have paid for the brushless system!

Ok, now, because this is such a massive engine, I had to make the hull even BIGGER! It now rings in at a neat 54in long.

Modeled the engine and stuffed it into my hull model to see how fitment would work... fit like a glove.





(You can see a second style of boat that I was considering in the picture above!)

So next up, I made the plans, and transferred them to masonite wood.




I then started to assemble the parts!




I screwed the panels to some inner blocks of 1/2in plywood, making sure that there were no waves in the them. Then hot-glued along the joining edges.

And I made the top!




I then used more blocks of wood to screw the top on!



And I filled the joining edges with cardboard and hot glue to act as a base for autobody filler.





I then filled the gap around the top.



After working many hours trying to make the sides straight, it was time to prime and paint the hull!






Yes... that's three different colours! lol! I used some old paint that had been in our basement for years... so it was a mis-matched paint job!

I then made fiberglass molds from the wooden boat!




And then the parts from the molds!







Then I joined the top and bottom with more fiberglass, and began fixing some problems in the gelcoat.




And painted!



Polished!



AND NOW!!! The drive components!!!!!




I made some steel engine mounts, and also some Oak stringers.

The brass drive tube was cut to length and bent to fit the hull, and the flex shaft was shortened.





I then spent some time polishing some parts to a mirror-like finish for the extra blingbling factor! Smile



And here is all the radio gear! Most of it was bought from HobbyKing!



First off! I got the metal geared, high-torque TGY1501 analog servo. 0.16s/60°, and makes 15.5kg/cm at 4.8v... will be used for the throttle! Should be more than enough torque to pull the cable!



For steering....... well, I went maybe a tad overkill!!!!

This is the Turnigy 1270HV Digital (MEGA!!!) torque 1/5 scale servo! It makes a whopping 40kg/cm of torque at 7.2v!!!!!!! And still only takes 0.18s/60°!!! Rings in at a sweet 170g! LOL!!



Beside a standard sized servo!



Also got a waterpump, and a BEC for the steering servo.





I found a box to put the radio gear in, and I did some more polishing!




I then started on making the top canopy!

This is a template to make sure I will clear the engine!




I used this foam to make the canopy!






AND ON THE BOAT!!!!





I now have some more autobody filler on this top!




And I just got a new order... my Carbon/Kevlar!!!!!



The colour looks perfect! This will go on the inside of the hull, to hold the oak stringers in place, and make sure the engine is secure!



AND THAT IS ALL! You are now up to date, and I will update this thread as I continue the build!!

Cheers all!

cheers


Last edited by MrRcFanatik on Wed May 22, 2013 10:24 am; edited 1 time in total
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Re: MrRcFanatik's Apache boat build! :)

Post by milemaster on Wed May 22, 2013 8:39 am

hey michael thats a very clever boat construction!!!! cheap motor !!! nice desing !!! i like the red carbon cevlar!!!!!

i realy enjoy it!!!!! i hope soon will see a special video with this boat!!!!!
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Re: MrRcFanatik's Apache boat build! :)

Post by MrRcFanatik on Wed May 22, 2013 10:15 am

milemaster wrote:hey michael thats a very clever boat construction!!!! cheap motor !!! nice desing !!! i like the red carbon cevlar!!!!!

i realy enjoy it!!!!! i hope soon will see a special video with this boat!!!!!

Thanks very much my friend! Yeah, the motor was VERY cheap!! Smile Unfortunately everything else has made up for that though... I've got $1500 invested in her so far Shocked

And yes! I'm sorry, I forgot to put a link to my video build series on YouTube!

This is part 16... the most recent!

The rest of the build videos can be seen on my channel!

Take care! Very Happy

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Re: MrRcFanatik's Apache boat build! :)

Post by MrRcFanatik on Tue May 28, 2013 5:11 pm

Got the stringers fiberglassed in recently! I've tidied it up a bit, and soon I need to sand it back nice and smooth, and then I can laminate the carbon/kevlar in!! Which by the way, is VERY difficult to cut!!!!!! I spent an hour just trying to cut up my pieces to size... and that's with some sharp titanium bladed scissors!



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Re: MrRcFanatik's Apache boat build! :)

Post by MrRcFanatik on Mon Jun 03, 2013 1:43 pm

So I managed to find some time to work on the boat recently, and I cleaned up the fiberglass job I did on the stringers!

I also laminated in the Carbon/Kevlar hybrid!!!!

This pic is just of the cloth lying in the hull (no resin yet)



This is a technic I found helpful! I used wax paper and clothes-pegs to hold the cloth close to the stringers.



Here it is almost fully cured.




I need to put another thin layer of resin on this to help strengthen it, and then it will be good! Smile

I also attached the fitting for the water pump!

I drilled and tapped the hole, and tonight I'll start the engine for the first time this year to make sure the pump works properly!




Cheers!! cheers

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Re: MrRcFanatik's Apache boat build! :)

Post by milemaster on Mon Jun 03, 2013 4:35 pm

great job!!! i love the red carbon !!!!!very clean job!!!!cheers!!!!
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Re: MrRcFanatik's Apache boat build! :)

Post by MrRcFanatik on Mon Jun 03, 2013 4:39 pm

milemaster wrote:great job!!! i love the red carbon !!!!!very clean job!!!!cheers!!!!

Thank you!! I really love it too!!! You wouldn't believe how hard it was to cut to size though... it took an hour just to cut up the pieces to do this lamination Shocked

I just tested the engine and water pump!! IT WORKS!! Very cool too! I'll get a picture up sometime! Smile

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Re: MrRcFanatik's Apache boat build! :)

Post by milemaster on Mon Jun 03, 2013 4:51 pm

i hope very soon we hve agreat video from you to see!!!
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Re: MrRcFanatik's Apache boat build! :)

Post by MrRcFanatik on Mon Jun 03, 2013 7:10 pm

Thanks man!

Here is a video I just posted on how to install a water pump! Smile

The video of the boat running... sadly, won't be for a little while longer!

https://www.youtube.com/v/yfqMoxiy8ps

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Re: MrRcFanatik's Apache boat build! :)

Post by MrRcFanatik on Wed Jun 26, 2013 7:17 am

So, I've missed a fair bit up updates here! Sorry!!!

Let's get you caught up to speed!

Finished the Carbon/Kevlar!




And I made a steel liner for the radio box to help strengthen it up!



I hooked up the throttle cable!



And made a kill switch!





I also made a mount for the 1/5 scale servo!  It's steel! Smile






Also, MHZUSA used to sell a bearing holder for the flexshaft... but after emailing with them, I found out they don't make it any more...
No worries!  I made one myself!






I finished the exhaust!




And made a plate from 1/8th in aluminum to strengthen the transom!




Got the bearings in the mail!




And there is more to come!  I just need to get some photos together and upload them to photobucket!

Very Happy

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Re: MrRcFanatik's Apache boat build! :)

Post by milemaster on Thu Jun 27, 2013 8:14 am

wowowow!!!!!! very nice my friend!!!!! i hope i see it soon in water!!!!
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Re: MrRcFanatik's Apache boat build! :)

Post by MrRcFanatik on Thu Jun 27, 2013 8:55 am

Thanks Nikos!! Two of my brothers are coming over tonight for the very fist float in out above ground swimming pool!!!!! I can't drive her because the pool is only 15ft in diameter, but I will start her up and make sure everything is working properly!!!

We are sooo close to the maiden voyage! Very Happy Very Happy Very Happy Very Happy

milemaster wrote:wowowow!!!!!! very nice  my friend!!!!! i hope i see it soon in water!!!!

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Re: MrRcFanatik's Apache boat build! :)

Post by MrRcFanatik on Thu Jun 27, 2013 6:24 pm

Ok I have a few updates...

Firstly, I welded a bung onto the exhaust for watercooling... tested it, and it works amazingly!!

I also finished the kill switch.  I used a spring, so that if the battery in the RX or TX dies, the engine will be killed.  Also, any radio communication loss will kill the engine.  And, if the radio isn't turned on, the boat won't start!

Pretty awesome!

I sealed up all the drive components, and loctited them on!  Got the brass drive tub resin'd in too!  So she's all sealed up!

AND!!!  We floated her!!

But...

She sits REALLY low... I mean REALLY REALLY low... The exhaust was almost fully underwater.

So we need to do a LOT of weight reductions... A start is the radio box... it weighs 3.5lbs!

So I've got my work cut out for me, but she is going to be insane when she's finished!  And you only learn by trying, so hopefully the next go will be good!

Wish me luck, and I'll try to keep you updated!

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Re: MrRcFanatik's Apache boat build! :)

Post by MrRcFanatik on Tue Aug 20, 2013 6:03 am

So it's been a while since I updated this thread.... so sorry!  Been quite busy lately!

But!!

....

....


The boat is basically done!!  Smile  I've got a few last little things to do, but she's up and running and I've managed to get just over 20mph from her!  Not a lot compared to you guys, but the speed suits her really well, and the purpose of her wasn't to get a lot of speed anyway....

The sounds of the 4-stroke and smells and the looks of her are most of what I care about.. speed wasn't as much!

The NEXT boat will be for some more speeeeeeeeeeed though!!!  Very Happy

Here's a link to a new video on the boat.... it's easier than uploading a bunch of pictures on here!


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Re: MrRcFanatik's Apache boat build! :)

Post by milemaster on Tue Aug 20, 2013 11:01 am

AS ALWAYS GREAT JOB MY FRIEND LETS SEE IT IN WATER!!!!!!!!!
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Re: MrRcFanatik's Apache boat build! :)

Post by MrRcFanatik on Tue Aug 20, 2013 11:29 am

milemaster wrote:AS ALWAYS GREAT JOB MY FRIEND LETS SEE IT IN WATER!!!!!!!!!
Thanks my friend!  I hope to show you her in the water very soon! Smile

Hope you are well!

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Re: MrRcFanatik's Apache boat build! :)

Post by Cataman on Wed Oct 16, 2013 5:23 am

Hey buddy. I'm glad that you share your amazing build with us.
Keep it up.

Kosmas.
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Re: MrRcFanatik's Apache boat build! :)

Post by MrRcFanatik on Wed Oct 16, 2013 11:55 am

Cataman wrote:Hey buddy. I'm glad that you share your amazing build with us.
Keep it up.

Kosmas.
Thanks very much my friend!  Good to hear from you!

To anyone who has not seen anything to do with the boat recently........

SO sorry for the lack of updates on here!

I have mostly finished the boat now, but there will be some more modifications that I will do to it next spring (2014)

In the meanwhile I am doing a custom Land Rover build for a client in the UK... I won't post pictures on here, seeing as this is a Boat forum though!

Here is a link to part 20 of the boat build for anyone who hasn't seen it!


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