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"Oldschool Excalibur 40 Hawk Acomms"

Old 05-25-2007, 08:34 PM
  #1  
jcplinux42008
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Default "Oldschool Excalibur 40 Hawk Acomms"

recently recived an old Excalibur 40 hawk r/c boat circa 1988. Im wondering what i can do aside from going brushless too make this thing zoom just for the hell of it not trying to get extreme speed , im buying a supervee 27 or a blackjack nitro for my fast boat. So far i have removed the transmission which was a 3:1 reduction and made it direct shft drive. Added an electronic speed control and a 19t double wound motor , the battery is a cheap radioshack 7.2 volt i think im going to get a 7 cell. Any input or maybe just others interested learning more. This boat holds sort of a special nostalgiac value to me , because my grandpaw got it when i was around 5 and we always ran it with his big boats and around the marina thank yo in advance.
Jcplinux
Old 05-26-2007, 09:34 AM
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Wheelnut
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Default RE: "Oldschool Excalibur 40 Hawk Acomms"

That sounds like a cool boat. Is it 40"? the name is a clue I don't think taking out the gear reduction was the best idea. You may need it. Especially if you are going to run a 540 motor. I think you should be looking at a 700 size motor. Can you post some pics of the outside and inside of the boat for us?
Old 05-26-2007, 03:27 PM
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Default RE: "Oldschool Excalibur 40 Hawk Acomms"

I took out the gear reduction and put in a 19t modified , and an electronic speed control. It is not a 40' boat it is 29' but the model it is based on is a 40 foot boat. It is a racing boat from back in the day that they made into an r/c model. It is very cool indeed. The gear reduction was meant for the old motor to give it some more torque but it would burn up a modified motor very quikly and the direct drive gave me much more speed. I am thinking about going brushless with it and see if i can get it too plane out , right now it wont plane out at all. I have painted it black and i dont have pictures of everything to post yet but there are some of befre i put the little side pieces on then one after i put the windshield and other stuff on. I want some advice from everyone on how to get this thing to fly without changing the outdrive i know a surface drive would be much faster but i dont want to mod this thing too much , i want to run about 16 cells and a brushless setup any suggestions. Also check out the pics i posted
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Old 05-26-2007, 03:33 PM
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Default RE: "Oldschool Excalibur 40 Hawk Acomms"

Here are some better pics. I had duplicates on the last post , The one thing im missing still is a picture of the direct drive completed , this boat is actually already on the water , almost everyday , i have a different battery than in the pictures. Ok thank you all again in advance for your input.

Jcplinux
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Old 05-26-2007, 03:52 PM
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Default RE: "Oldschool Excalibur 40 Hawk Acomms"

Hey Jcllinux,
I saw you over at Delco the other day. Looks like you've gone to see the wizzard. I was wondering if that interior plastic could be removed to make room for some cooling. (that motor was hot). Good to see you on here. See you on the water some time.
Old 05-26-2007, 04:27 PM
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Default RE: "Oldschool Excalibur 40 Hawk Acomms"

That is too weird. Two years ago I was hanging out at the local hobby shop and one of my buddies heard I was getting interested in RC boats and he brought that same boat in. This guy has all kind of old rc stuff stored all over the place. He even used the attic at the LHS to store some of his stuff. Anyway he asked if I was interested, I took one look at it and said no way. Especially when I saw that rudder that went straight through the bottom of the hull. That was a long time ago. I knew it could turn out to be a pretty good boat but I also knew I did not have the experience to get it done.
Old 05-26-2007, 09:39 PM
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jcplinux42008
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Default RE: "Oldschool Excalibur 40 Hawk Acomms"

What would be a good inexpensive brushless setup for this boat , im shooting for 20-30 mph nothing more than that , i dont want to make it too fast and wreck it. I need a new radio and the main parts will all be new , the radio however for as old as it is does the job very well. gimme some good feedback
Jcplinux
Old 05-26-2007, 10:26 PM
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Default RE: "Oldschool Excalibur 40 Hawk Acomms"

I always say where theres a will theres a way so , i will get the water cooling once i get the new motor and esc , ive been looking att offshore electrics and found the sv27 esc and some inexpensive brushless motors for it , im going to hook it up with 14 cells and see how fast it goes. I have a question about the motors specifically , they give a rating at the top of 5,096rpm/volt , the cheapest motor has the highest of this rating and im trying to figure out why that would mean at 16.8 volts it would push close to 95,000 rpms , does that mena no load rpms and when i put it in the water its much less than that , or is that just actually what it is. I dont know much about brushless so input would be helpful , i will keep coming back as this moves along and get the handling issues tweaked out , right now im just trying to get the prop spinning faster and of course modding in a water jjacket , my plan with the water cooling is to heat the plastic and bend it in a little bit right there in case you were wondering removing it would put a hole in the hull and i dont want that. I also need a better way to mount the motor and space is very limited in the motor area ok thanks
Jcplinux
Old 05-27-2007, 07:09 AM
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Default RE: "Oldschool Excalibur 40 Hawk Acomms"

This is going to be a tough project. I think the SV27 brushless system is about the cheapest you are going to get. But it will be interesting to see how it performs with a subsurface drive system. You can buy a motor mount from OSE and epoxy it in the bottom of the boat, but I wouldn't do that till I found out how the brushless will perform with the subsurface drive. The idea of converting it to a surface drive has crossed my mind. I would also think about taking out the stock rudder and putting one of the transom. It is very rare to see a subsurface rudder.
You have plenty of space in that boat. Here is a pic of limited space.
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Old 05-27-2007, 08:04 AM
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Default RE: "Oldschool Excalibur 40 Hawk Acomms"

When he talks about limited space he's talking about the sub hull that surrounds the motor. I saw it. It's a problem, but it can be solved. I think it's going to be tough to get 20-30 out of it with the sub surf drive. SV's to that with a much more efficient system and are very sensitive to trim changes. Now point the strut down at a 10 deg angle and you wont be breaking any speed records. All the same I'd like to see what happens when you put more power behind it. But I daydream about putting a 700 hp small block in my brother inboard ski boat too.[:-]
Old 05-27-2007, 12:37 PM
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Default RE: "Oldschool Excalibur 40 Hawk Acomms"

Oh i will get it going 20-30 , the one thing that stands out to me is how light it weighs less than 5 pounds , of course when i add 14 cells and a new motor and esc , it will push at about 6 or so maybe , i may work out a system for a surface rudder but im trying to do as little plastic modification as possible. Trying to mod it for a surface drive is something im not even going to begin to attempt thats too much work and i might mess something up and that would be that. But my limit on space is going to be biggest challenge getting a new motor in there. I thouht also about a 700bb motor , but i still think the brushless is going to be way better and the sv27 speed control looks like it will handle what i need. I would think that the boat is doig at least 10mph right now , when i have two packs in the boat they will be mounted on either side of the motor on the two slanted parts. ok sv27 dayton when i get this worked out can you do whatever it is you doo to clock the speed of the boat , i want to know how fast i get it going , i may not get the aquacraft brushless motor and instead get something a little bit better , im not going for obvioulsy anything but personal amusement so im not worried whether im buying the highest quality , i dont want poor quality i just also dont need ultra high quailty and everthing i look at is on offshore electrics. Like i said too my goal is 20-30 so if that doesnt get me thieir i will go bigger , i will more than likely be pretty pleased after this brushless system and then work out the trim and i think with the batterries up front it may trim out better , ok so point me now in the direction of good cells i want to build the pack myself. i have thought about a possible solution to my motor space issue and that would be to use some sort of glue to glue it in place after i test run it a few times first to make sure its worth a final glue down and then attach the regular motor mount just for extra support. It will be about a month before i can even order the expensive parts so i may be able to work a few handling issues before i get the new motor , i plan on adding turn fins and trim tabs , i dont want to water cool the motor in it now just because im not going to be using it much longer , im going to use my old speed control and motor in a car im going to get sometime.on emore question and im done, would standard heat sink cooling keep the motor cool enough or is water cooling the way im going to have to go in regards to the brushless system. ok keep it coming guys oh and one other thing so i dont post again , what is a good prop too use i need one with a set screw and non threaded and i pretty sure its 4mm shaft diameter if not i already had to drill out a threaded prop to make it fit and that worked fine , jackass told me it wasnt threaded but it was , he is a plane guy so i forgive him.
Jcplinux
Old 05-31-2007, 11:31 PM
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Default RE: "Oldschool Excalibur 40 Hawk Acomms"

Ok i havent been getting much more feedback but here are a couple more pictures to show the finished direct drive dogbone and universal joints , and also one to show the new paint job both are from my crappy cell phone camera because the batteries in my digital camera keep dying while im trying to transfer the pictures anyways , i am investing in a nitro blackjack 26 and working on that for a little while this project is going to take a little time to get everything i need and get it ready for the water again , im planning on actually putting some parts on layaway at the hobby shop in my area so i can get the parts i want instead of the cheapest parts , but as soon as i get something accomplished i will post on here.
Jcplinux
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Old 06-01-2007, 06:03 AM
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Default RE: "Oldschool Excalibur 40 Hawk Acomms"

Ohhh man. Black Jack huh? Well the Nito forum is that way! Just kidding. Maybe I'll see you out at Delco sometime and we can line up the SV and the Blackjack on the pond. I'll look for you.
Old 06-15-2007, 12:40 PM
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Default RE: "Oldschool Excalibur 40 Hawk Acomms"

Sorry i had my internet shut off for about a week , but im back online again , i am actually going to go ahead as planned with the blakcjack but im getting the brushless setup for the electric boat , an sv27 dayton you were right i chaged to a higer quality battery pack and my speed is much improved , now im ordering cells to build a packs for a brushless esc , im thinking 12 cells will be plenty , that thing is so light i dont think 20-30 mph is really out of reach , i may not go brushless and actually just run a 700bb SC on 12 cells see what that does , my take on that is to keep it oldschool , use a brushed motor since its older technology and an older boat , but i would like to see it fly with a brushless , im afraid it would flip over if i hit the wind wrong because its been starting to do that , i took it too Eastwood Lake in riverside and it was pretty rough and it handles very well on rough water , but the wind was blowing and it almost flipped over a bunch of times , so i had to keep it away from the wind as much as possible , yea and the thing ive noticed about the Sv27 is that it bounces alot at high speeds , and the black jack seems to handle pretty well , mostly i just want a nitro boat for the noise and all that good stuff. On a side note the new battery pack is good however i am replaceing the tamiya connector with a deans ultra because i melted the two tamyias on the speed control and battery packl together , while running the boat , and everything is getting very hot across the board still so i need my new motor damint , and i need to replace the brushes by now im sure. ok i will be on here more often now that my internet is back again.
Jcplinux
Old 06-15-2007, 01:08 PM
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Default RE: "Oldschool Excalibur 40 Hawk Acomms"

I don't know about 30 but It'l be fun to see what it can do with that drive. I have a GPS so if you want to know how fast you are going we could meet and see. As long as you tape the hatch while my GPS is in there.
Old 06-16-2007, 10:30 AM
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Default RE: "Oldschool Excalibur 40 Hawk Acomms"

Haha not a problem but might be a better idea to put the gps in something to keep it safe , that boat is real hard to seal up it has lots of open air space. I would like to know how fast its going currently just to see what im starting at. , Im going to get my deans connectors tomorrow and soldering them on , if i make enough money at work tonight i might be able to go aheasd and order my new parts as well. I can tell you its alot faster than when you saw it at delco too , that radio shack battery i was using blew a cell , and i dont thik it was supposed to be fast charged either. OK im outa here
Jcplinux

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