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View Full Version : BL Mini-C w/2700KV ammo 11.1V Lipo



jfabcustom
12-17-2008, 09:13 PM
Built this with parts from my Mini Rio project that I abandoned.
http://i91.photobucket.com/albums/k301/jenai-84/PC170075.jpg

JimClark
12-17-2008, 09:18 PM
Ad some more pictures and specs that looks pretty interesting

Jim

jfabcustom
12-17-2008, 09:37 PM
http://i91.photobucket.com/albums/k301/jenai-84/PC170070.jpg
http://i91.photobucket.com/albums/k301/jenai-84/PC170077.jpg

The first picture is the plastic mount that I made for the speed control
The speed control is for an SV27
The motor is an Ammo 28-35-2700
The battery is a 3S1500 Mah 25C pack

The second picture is the hardware it's for the mini hydro from mini cat racing
The prop is an Octura X430

jfabcustom
12-17-2008, 09:47 PM
This is what happend today when the rudder hit some unkown object that is submerged in the local pond.

http://i91.photobucket.com/albums/k301/jenai-84/PC170065.jpg

jfabcustom
12-17-2008, 09:50 PM
I cut this hole so I could get to the crack from the inside
http://i91.photobucket.com/albums/k301/jenai-84/PC170074.jpg

jfabcustom
12-17-2008, 09:52 PM
Five Minute Epoxy to the rescue!! :buttrock: :rockon2:
http://i91.photobucket.com/albums/k301/jenai-84/PC170078.jpg

jfabcustom
12-17-2008, 10:04 PM
I used five minute epoxy on the crack. Once it set I decided to fill the rest of the hull with foam. I had already filled the bow.
http://i91.photobucket.com/albums/k301/jenai-84/PC170079.jpg
http://i91.photobucket.com/albums/k301/jenai-84/PC170080.jpg
http://i91.photobucket.com/albums/k301/jenai-84/PC170081.jpg
http://i91.photobucket.com/albums/k301/jenai-84/PC170083.jpg
:cursing::eek:.

jfabcustom
12-17-2008, 10:09 PM
That's it for now. I'll try to get video once it runs again, provided it's longer than 40 seconds.

jfabcustom
02-16-2009, 02:40 PM
This is a new hull with a new inline strut/rudder bracket that I designed and scratched out on my Dad's Bridgeport Mill. The blue anodized parts are from Mini Cat Racing and the raw aluminum part is what I designed. The component layout inside the hull will be different this time as well to accomadate a much lower C/G. Hull is ready to be tub tested. If she doesn't leak I'll just need to make a longer rudder pushrod and she'll be ready to run.
http://i91.photobucket.com/albums/k301/jenai-84/P2160087.jpg
http://i91.photobucket.com/albums/k301/jenai-84/P2160091.jpg

Meniscus
02-16-2009, 02:52 PM
Good looking build. I'm curious to find out what the transom weight is and how it sits in the water. Have you figured out where the COB is?

jfabcustom
02-16-2009, 03:52 PM
Not yet I just finnished the tub test. No leaks! It didn't seem to weigh the transom much more than the previous setup. None of the internal components had been installed at that point(speed control, reciever, batt, ETC.) So it was hard to tell. I'll get a pic in the tub when she's all together. maybee tonight.

jfabcustom
02-16-2009, 05:24 PM
Ok here are some pics. In the first two the hull is balanced at 4.5" from transom which is about 32% of the 14" Hull


http://i91.photobucket.com/albums/k301/jenai-84/P2160095.jpg
http://i91.photobucket.com/albums/k301/jenai-84/P2160097.jpg
Next is the layout inside the hull


http://i91.photobucket.com/albums/k301/jenai-84/P2160100.jpg
and these two are how it sits in the water. it doesn't sit much lower in the rear than it did with the previous setup.


http://i91.photobucket.com/albums/k301/jenai-84/P2160102.jpg
http://i91.photobucket.com/albums/k301/jenai-84/P2160103.jpg

jfabcustom
02-18-2009, 01:39 PM
Any thoughts/Comments?

Meniscus
02-18-2009, 03:57 PM
I'd say try it and see how it runs!

Also, wash the bathtub ;) LOL => you asked for thoughts/comments! Or put a mat down to cover it up next time ;) J/K

Make sure you get a video of the maiden voyage! We're looking forward to seeing how she runs.

jfabcustom
02-18-2009, 08:07 PM
Your right! I guess it is about time for a CLR treatment in the tub? LOL! The fact that I work with metal all day doesn't help the tub's situation either. I'll make sure to get a video next time I run the boat. I should be able to run it soon since the weather here just cleared up today. Although the pond may still be in pretty rough shape due to the storms we had. It's only knee deep and it fills with leaves and twigs sometimes.

Meniscus
02-19-2009, 08:27 AM
That must make rescue fairly easy!

jfabcustom
02-19-2009, 11:46 AM
That's the primary reason it has become my test pond. No rescue boat required!:rockon2::buttrock:

jfabcustom
02-19-2009, 11:53 AM
We're looking forward to seeing how she runs.

Who's we?

jfabcustom
02-21-2009, 10:04 PM
Ok here's the video. The new setup seemed to work well! I think with a little tuning it will run even better. There is a little play in the steering pushrod and I think eliminating the play will also help. Big thanks to my Dad for everything he's tought me on his mill. He's the man when it comes to making brackets. Thanks Dad!


Click play all videos
http://www.youtube.com/view_play_list?p=36598D4690290161



by the way Meniscus, this was not the shallow pond where I normally run, as it was full of moss.

jfabcustom
02-28-2009, 11:25 AM
Anyone have any Ideas on why she's hopping out of the water? I've tried several tuning adjustments: strut height, strut angle, C/G. Nothing seems to help. This thing just want's to shoot right out of the water. I'm thinking that, due to the size of the boat, the tunnel may be too shallow, and when it airs out, the boat takes flight.

Here's the funny part. There is a video on you tube called Ballistic Proboat Mini C. This boat still has the steerable drive on it and it seems rock solid at almost top speed? crazy!:confused2: I feel like giving up. It may be time for a new build. A larger size hull that's meant for some speed. This little boat certainly got me hooked though.

thegreat1
02-28-2009, 11:40 AM
if you are done with it you should sell it arr i would buy it if the price was right. let me know.

jfabcustom
02-28-2009, 03:09 PM
It's not worth selling. I'd never get my money back. I sorta lost my ass on this one. But it wasn't a waste. I've learned a lot from building this little thing, mainly not to go overboard with a hull that will not perform how you want it to. I may try running the stock out drive like this guy http://www.youtube.com/watch?v=XEMWA1U6IEQ Though everything I've read states how unstable the steerable out drive is, this is the most stable Mini C I've seen.

jfabcustom
03-01-2009, 09:36 PM
I'll try again. Anyone have any ideas on why this thing is porpoising? Here's a video http://www.youtube.com/watch?v=kXPCxrI_d4I any input is appreciated! Thanks!

jfabcustom
03-03-2009, 11:14 AM
Either no one is interested in the Mini C anymore, or I'm just gettin' no love from you guys. Am I doing something wrong? What's the deal, how can I get some help? I see the views going up on my thread but I get no responses, No help.

Anyway, I'm going to try lifting the strut. I'll need to change the angle of the stuffing tube so that it exits the transom a little higher. This will allow me to raise the strut without binding the flex cable.

Anyone, anyone, Bueller, Bueller, Bueller????:confused1:

Meniscus
03-03-2009, 12:25 PM
It looks like too much air in the tunnel section. Try changing the angle of the strut so that the prop is slightly lower than the front of the strut. This will push the nose down while running.

:smile:

jfabcustom
03-04-2009, 03:26 PM
Thanks for the response! I believe my main problem is limited strut adjustability. I can only adjust so far in any direction before the flex shaft binds. This is because of how close the strut is in relation to the stuffing tube. If I lift the exit location I will be able to lift the strut up without binding the flex cable.

From my research I 've found that most people like to set the bottom of their strut housing even with the bottom of the boat and then adjust up from there. IE - Boat sitting flat on the table -- strut sitting flat on the table. Mine seems to be alot lower than this ''standard''. So I will try to achieve this first by moving the stuffing tube up, and from there I'll make small angle and hieght adjustments to the strut to get her dialed in.

Man, it sure helps to get input from people with experience, but one sure does learn alot when forced to dig for the answer. I just get side tracked so easily when searching through the forums.

Thanks again, James :buttrock:

Jesse J
03-05-2009, 06:01 PM
Great looking mods! I am working on a scratch build modeled after this, so I have been following to see what I can learn. I like the sound of these last two responses. I think Meniscus hit it and you identified the limitation. How about this: extend the length of exposed stuffing tube.

My thread (scratch build micro cat), I will be updating soon shows probably 3" of exposed stuffing tube; I think you could use more exposure... My recommendations:

1) trim off the plastic housing that accompanies the stuffing tube to the exit point at the transom so that there is an oval hole in the tunnel.

2) fill this hole with JB or Epoxy.

3) now you have potentially inches more stuffing tube that you can bend up or down with the strut adjustments that are being recommended.

jfabcustom
03-06-2009, 12:58 PM
Moving my stuffing tube freed up all kinds of adjustment. but no matter where I placed the strut the boat would still jump out of the water. I even tried some extreme downward angles but no luck (though I got better launches with these angles).

Oh well, I was hoping I could get her dialed. I think since this hull is so small and weak and cheap and warped and ETC. It's just not worth tying to make it go fast.

not sure what's next? I like cats, always have.:smile:

Meniscus
03-06-2009, 05:13 PM
Try moving the CG forward. Always remember that it may not just be a strut issue if you can't resolve that way. Sure, it will run a little wetter, but it will be more stable.

Meniscus
03-06-2009, 05:17 PM
After looking back at your pictures, your last option would be to skeletonize your custom bracket for the rudder. If you don't like the looks of straight holes, try going with triangle shapes. This will help reduce the amount of weight you have in the back with the removal of excess material.

Finally, you could try putting some weights in the front, just to see how she responds to the CG difference.

Hope this helps :thumbup1:

Meniscus
03-11-2009, 09:35 AM
So what did you decide? What is you plan of attack?

jfabcustom
03-13-2009, 11:30 AM
Good call. I think lightening the bracket will help for sure. I also want to stiffen up the transom. It has some flex to it and I think that may be a contributing factor as well. I'll keep you guys posted.

Also, I have experimented with weights in multiple locations, and it seems that any addition of weight seems to make the problem worse.

I think the next build will be a Blackjack 26. I'm gunna keep the Mini-C in the fleet though for sure! Thanks for all your help Meniscus! It is much appreciated!

:rockon2::buttrock::thumbup1::smile:

Meniscus
03-13-2009, 01:12 PM
Well I'm not sure I was much help, but it's no problem, anytime.

jfabcustom
03-14-2009, 02:08 PM
It's always a big help to me when someone else puts their ideas out there. It seems to either confirm ideas that I've already had, or start new ones that, as a newbie, I wouldn't even think of. So keep em coming man, and Thanks.

:rockon2::buttrock:

BigJay
03-24-2009, 03:14 PM
I also Have a Mini-c and an ammo 4040kv to put in it just to see how fast it will actually go beofre flight is accomplished...lol I like what you've done so far and it has giving me a ton of ideas. Keep up the good work man. Good to see guys cutting up metal and fabbing up own parts. Me like.

Keep it up, Jay

jfabcustom
03-24-2009, 05:07 PM
Thanks man.

I think I have almost reached the point of taking flight with the Ammo2700Kv. I'm not sure what else it could be. I have tried so many things to keep this thing from hopping, and It just won't stay in the water. I've tried shifting C/G forward and backward with various weights. I drilled lightening holes in the bracket to lighten the transom weight(Meniscus' Idea). I even taped my tool kit on the bow to where the tips of the sponsons were in the water. Damn thing was still hoppin' out of the water once it got up on plane. I've tried different rudder angles by adding shims behind the bracket. I also tried adding hatch tape to the steps in the hull to kinda eliminate them. I started with one strip just to cover the vents. No change. Then I added several layers to the rear step bringing it up flush with the second one. No change. I think I just have too much power for this size hull. Although the boat want's to porpoise even at 1/4 throttle so I'm not 100% sure that overpowering is the issue.

jfabcustom
03-24-2009, 05:26 PM
Big Jay, how many volts will you run to your 4040Kv Ammo?
What kind of cells?
2s Lipo would yeild a similar RPM to my setup (Just under 30,000 RPM).
3s Lipo would be 44,844RPM!!!!!! Flight for sure!!! LOL:rockon2::buttrock:

BigJay
03-25-2009, 08:24 PM
was thinkin 3s cause pops has those he runs in his planes and heli's think i'm gonna put my stock BJ 26 prop on it too. I don't think its gonna work real well but it could be FUN!!

jfabcustom
03-26-2009, 11:10 AM
Don't forget your hatch tape when it comes time to run it. LOL:laugh:
I think you may be in for some blow overs. My boat torque rolls quite a bit even with an X427 spinning at 29,970 RPM.
But hey, you never know until you try it. That's my motto, that and -- Everybody Wang Chung tonight!!!:unsure:

Meniscus
03-26-2009, 04:24 PM
Have you tried different props with the same results?

jfabcustom
03-26-2009, 08:34 PM
Just the X427 and X430. I heard somewhere that having less rake on the prop would help. I may try to modify a 27mm plastic prop that I have to see if it helps. Any thoughts?

Jesse J
04-01-2009, 10:35 AM
Dang, sounds like a battle with this guy. What is your weight? Have you tried 2S? I had a similar problem with my miniscat that I put a 12S motor and after batteries it weight nearly 2lbs. Unless you have some hull warping issues, you may have too much weight. I would try 2S and then a really light 3S if the problem seems to subside. Then if all else fails, have you tried trim tabs? It is sounding pretty hull related.

jfabcustom
04-01-2009, 05:21 PM
I'm not sure what it weighs, as I do not have a scale. I'll let you know in a few days. My Dad has a nice scale I can use.

I haven't tried 2s yet. I thought about it. Good idea:thumbup1: that may be the next test after I try this plastic prop I modified. it's the first prop Iv'e played with. I figured I'd mess up the plastic one before ruining a nice metal one.

The hull is slightly warped. It came that way from the factory. I'm sure it doesn't help my situation.

I'll keep you posted.

Jesse J
04-02-2009, 01:35 PM
I just weighed mine, a 13 inch scratch built, just under 13 oz loaded up with hatch on. I am using a 29mm prop on 2s with a mystery outrunner.

illz302
10-04-2009, 10:18 AM
wow this is an amazing mini c nice work!

jfabcustom
10-04-2009, 01:13 PM
Thanks man! I spent some time experimenting with this thing. It was a blast!:buttrock:

illz302
10-04-2009, 02:43 PM
Can you send me any info needed for the swap to the mini hydro parts? And did you need to make a custom bracket or could you just mount the rudder separate?

jfabcustom
10-05-2009, 11:02 AM
I designed and built the bracket myself. The blue annodized stuff is all from mini cat racing they sell it here on OSE.

This is the thread where I got alot of info on stuffing tube, flex cable, strut/rudder, ETC. http://forums.offshoreelectrics.com/showthread.php?t=2245

You can mount your rudder wherever you want. I was just experimenting when I made that bracket. It's actually better to have your rudder to one side of the prop so it's in clean water. Just make sure the rudder pivot point is either even with or behind the prop. Hope this helps. Good luck and happy boating:buttrock:

illz302
10-05-2009, 03:23 PM
I designed and built the bracket myself. The blue annodized stuff is all from mini cat racing they sell it here on OSE.

This is the thread where I got alot of info on stuffing tube, flex cable, strut/rudder, ETC. http://forums.offshoreelectrics.com/showthread.php?t=2245

You can mount your rudder wherever you want. I was just experimenting when I made that bracket. It's actually better to have your rudder to one side of the prop so it's in clean water. Just make sure the rudder pivot point is either even with or behind the prop. Hope this helps. Good luck and happy boating:buttrock:

wow thank you very much for all the info I just ordered a turnigy 2700kv brushless motor from hobbycity and I will be using it with my sidewinder micro esc. This will really help me get everything working properly.

sorry for another dumb question but is there any particular reason why the rudder should be mounted at lease even with the prop or further back?

jfabcustom
10-05-2009, 07:40 PM
It makes the boat pivot about the prop instead of a point in front of the prop. This keeps the prop from sliding sideways through the water in a turn.

illz302
10-05-2009, 08:21 PM
It makes the boat pivot about the prop instead of a point in front of the prop. This keeps the prop from sliding sideways through the water in a turn.

Oh ok that makes sense thanks again for all the info!:bowdown:

jfabcustom
06-23-2010, 03:08 AM
Ok, I just finnished helping my buddy get his 1973 Sleekcraft Daycruiser Jetboat back on the water. It's been like a side job for me since I've been out of work. Anyway, we had it out at Anderson lake in Morgan Hill, Ca over this past weekend. We installed a new crate 454 with new Edelbrock Marine carb it was a major improvement over the tired old 454 and quadrajet. We also rebuilt the Panther jet drive with all new seals and bearings and we installed a Jetovator wich gives the driver up and down trimming of the jet.

First run we tried a rebuilt Quadrajet carburetor from JET performance but it was defective. We bolted on the new Eldelbrock and it ran better than ever! Last summer with the old 454/Qjet setup we got about 38-40mph out of her on the GPS but we could never get past the bog when the secondaries would start to open. This summer with the Edelbrock We broke 50mph and with some trimming of the jetovator on the Panther Jet we rebuilt we got 52mph! Not to mension the acceleration felt nearly twice as fast. He punched it when he came out of the 5mph zone, he went straight into the secondaries to see what would happen and that 454 just lit up and popped us right out of the water. I was so happy.:biggrin:

Anyway:blah:, while we were anchored in a cove basquing in our glory and praising Vic Edelbrock, I couldn't help think about how cool it would be to have my Mini C running again so I could rip it around while we're at the lake. So it inspired me to get it going again.

Unfortunately it got bumped off the shelf where it's been sitting. The rudder broke and the transom cracked. So last night I ordered a new hull and rudder. Im going with the same strut but a side mounted rudder this time instead of my wierd inline bracket. here it is http://www.offshoreelectrics.com/proddetail.php?prod=ose-80048

I'll probably experiment some with the layout inside the boat to get my COG where I want it.

I'll be posting progress.:beerchug:

jekaio
01-09-2012, 04:46 PM
update?