cyberhoops's blog archive for January, 2009 - RC Groups
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Archive for January, 2009
Posted by cyberhoops | Jan 31, 2009 @ 10:03 PM | 3,883 Views
I am going to test out the Rigged Insanity color scheme on the sponsons before I commit paint to the entire model.

The general color scheme plan right now will be copper/orange flames over a blue background (with maybe some airbrush highlights on the flame edges). I applied the copper paint and a vinyl paint mask (the yellow), so next comes the blue.
Posted by cyberhoops | Jan 30, 2009 @ 07:13 PM | 3,787 Views
The ProBoat brushless Elam hull arrived today - just the bare hull that we plan to fit with a UL-1 motor and speed control along with various other bits of running gear from the now defunct 1982 Oberto. It certainly was well packaged as a box inside a box, inside a box, inside a bag, surrounded by foam.

The bare hull weighed in a 2lb 1oz, and included the radio box.

Step one will be to remove all of the decals since the plan is still to repaint the boat to be more like the 1991 American Spirit and race it as a limited spec hydro.

After that I am will be guessing a bit in how to fit other hardware, like a Speedmaster strut and rudder onto the hull. It should be interesting.

[Edit] On closer inspection it looks like the Speedmaster rudder will work, provided the direction of the control arm is flipped. The Speedmaster strut also looks like a fit, although a bit tight.

For the turn fin, I think I need to get the "original equipment" turn fin for the boat. The mounting plate is slanted and the Fuller's aluminum turn fin that was used on the Oberto would need some major tweaking to fit. I guess I will have to check into more options for the turn fin or go stock.

For the servo, I have been using the Traxxas waterproof servo, but that one is too big. Also the standard Spektrum Z270 is too big. Hmmm...

The decals all came off very cleanly, so that was a plus.

[EDIT] - it is now Feb 3rd and the basic paint job for the American Spirit look is complete except for some touchup painting. Next will be to add the decals and clearcoat.
Posted by cyberhoops | Jan 30, 2009 @ 01:46 AM | 3,984 Views
Here are some images of the initial rudder and servo linkage for the rigger. I added two 1/8" plywood plates epoxied to the bottom of the rigger to make a 1/4" thick mounting plate. The I used a JR aileron servo tray held by screws into the mounting plate. There is just enough room to get a screw driver into the 4 mounting screws, but it does make putting in the two rear screws a bit of a challenge.

The servo is a Traxxas waterproof servo. With a slight expansion of the hole in the radio compartment bulkhead made it a straight shot back to the control horn of the rudder.

It seems pretty solid.

And not surprising I guess that it is nearly the same layout that Hotwater posted as a reply to a blog entry.
Posted by cyberhoops | Jan 29, 2009 @ 07:20 PM | 3,995 Views
I have made a little progress on the Rigged Insanity - adding the 1/4 inch stuffing tube for the .150 flex drive with a teflon liner. The Speedmaster strut is also mounted now on the transom.

I did try annealing the brass tube this time, but since I don't have a propane torch I just set the brass tube on a burner of the electric stove and turned it on max. In just a couple minutes you could see the brass tube turn a bit of a gray color...not exactly red hot... but it worked.

Afterward it was much easier to bend the tube. The tube was secured with epoxy and Micro-Balloons filler. I am not sure if I am going to do something to reinforce the area with fiberglass and epoxy.

And, I have decided on a paint scheme now which will be light blue with gold metallic flames. I purchased a vinyl paint mask of flames made by Parma from the LHS, and the paint will be the Duplicolor automotive spray paint.
Posted by cyberhoops | Jan 27, 2009 @ 07:23 PM | 3,829 Views
I have been working on the sponsons for the Rigged Insanity. I must say that one sponson takes longer to do than the entire tub. I guess the sanding and shaping required is slowing things down a bit.

Attached are some pictures. It took a bit of time to make sure that the alignment was correct for the carbon fiber tubes, but with the laser cutting it all worked out without too much effort.

The left sponson will probably go a bit smoother now that I know a bit more about what I am doing.

I like it.

And... the second sponson was much easier, both because I knew more about what I was doing and because I did not have to set things up for the turn fin.
Posted by cyberhoops | Jan 27, 2009 @ 01:07 AM | 3,870 Views
Maybe the best boating investment we made was getting a rescue tug. In this case the tug is a Vac-u-Tug. More than once we have been able to send out the tug, hook up to a disabled boat and bring it back to shore.

This picture does not show the fishing line, but the spool in the back has about 25' of green fly fishing line wrapped around it. The fly fishing line floats so there is less chance of getting it caught in the prop. There is a swivel hook on the end of the fishing line that connects to a short leader off a tennis ball.

The Vac-u-Tug is not fast, but at least for hydroplanes it has more than enough power to bring back in the boat. We have since upgraded to the 4 bladed prop that is sold by the Vac-u-boat guys and that did make a noticable difference in the pulling power.
Posted by cyberhoops | Jan 26, 2009 @ 08:00 PM | 4,004 Views
Under the heading of "You can't have too many boats", I started a build of a Rigged Insanity from Osborne Models. My initial impression is very good. The directions are good, the laser cut parts fit together smoothly and in under an hour I have most of the tub complete.

It is quite a bit bigger than I thought it would be, or at least the center section tub is wider than I imagined. The inside of the tub is about 3.75 inches wide, which will be plenty of room for the motor, speed control and so forth.

I am planning to make this is P-Spec powered rigger using the UL-1 motor and speed control.
Posted by cyberhoops | Jan 23, 2009 @ 11:56 AM | 3,674 Views
Given that the 1982 Oberto is toast the new plan is to get the bare hull for the Proboat brushless Miss Elam, and then outfit that boat with the UL-1 Motor/ESC combo and the drive hardware from the Oberto.

Along with the hull I think I will get the Elam radio box and motor mount since that will save some building time.

The plan is also to repaint the hull to be like the 1991 American Spirit, just to be different. (And because I already have graphics for the American Spirit decals)

Racing is now about 6 weeks away...
Posted by cyberhoops | Jan 22, 2009 @ 11:51 PM | 4,081 Views
The Pay-n-Pak does not have decals yet, but went out today for a first on water test - and it was successful.

We ran with a Proboat motor, ETTI 100 amp speed control and a 4s 4000mah MaxAmp battery pack. We used an X640 prop for the first test. According to the GPS the boat topped out at 39.4 mph. I think the boat had a nice ride and looked quite stable in the water. The tape down hatch worked ok and the inside of the boat was dry at the end of the runs. What more could you ask for in an initial test run.

The next test will be with the modified XM640 prop that we first tested with the 82 Oberto on the UL-1 motor. That prop was clocked at 39.7 mph with the Oberto so it will be interesting to see if the modified prop is an improvement or not over a stock X640. (The XM640 is my terminology for a X640 prop that has had the "ears" removed)
Posted by cyberhoops | Jan 22, 2009 @ 11:41 PM | 3,493 Views
The 1982 Oberto went out for another test run today using a larger M645 prop. The speed was up to 44.6mph, but with a bit of sponson hop. According to the Eagle Tree logger it was pulling right at 55 amps on average, which is right in line with the 60 amp rating for the motor and ESC.

We decided to lower the strut 1/8" and take it out for a second run to see if that would help the sponson hopping. After one lap at moderate throttle Kyle kicked it in gear ... and ... a loud thunk sound and she went dead.

Out comes the Rescue Tug (a Vac-u-Tug) to retrieve the boat and we found that the .130 drive cable was a twisted mess and the motor mount had been broken loose. This all looked pretty repairable until a closer examination of the hull revealed multiple cracks in the sponsons and in the nose. This wood boat is just not holding together at 45mph speeds.

So, we are going to finally retire the 1982 Oberto and come up with a different hull for LSSH racing.
Posted by cyberhoops | Jan 21, 2009 @ 12:13 PM | 3,493 Views
There is a build thread somewhere out there for the 1982 Oberto.

The boat was built pretty much exactly as designed in the plans from Dave Frank. The boat was initially powered by a Proboat brushless motor and speed control. We were out testing at Lake Wilderness, running a modified X640 prop and things were looking good - right up to the point where we ripped the sponson off the boat.

Since then the boat was rebuilt with two additional spars connecting the main hull to the sponson. One is an aluminum tube in the leading edge of the boat, and the other is a hardwood brace that links the turn fin support to the main hull. Also the balsa interface between the sponson and the hull is now 1/32" plywood.

The rebuilt boat is now powered by a Aquacraft UL-1 motor and initial testing shows that the boat hits 39.7 mph using the X640 prop. Now it is time to do some additional testing with different props and settings.
Posted by cyberhoops | Jan 21, 2009 @ 12:05 PM | 4,030 Views
Well, flying is fun but I have converted over to boats now. I used to race nitro powered sport 40 boats back in the early 1990's but stopped when they closed the only nearby test site. At that time my son was pretty young and used to come along to the races just to watch. One of his favorite memories is sitting up with the starter, watching the boats race and eating Oreo cookies.

Recently I found fast electric RC boats and I am hooked again. After checking out some of the local clubs, the E/RCU, Classic Thunder, and the Puget Sound Fast Electric Boat Club... I have decided to go with the PSFEBC. Now my son is also hooked on electric boats and we will both be racing together.

I have spent the past couple months building boats, testing them on local lakes, rebuilding boats and testing again.

Quick edit to add pictures of the other boats...

The current lineup of boats includes:

1982 Executone - 1/12th scale LSH (Dave Frank plans)
1982 O'Boy Oberto - 1/10th scale (Scaled up Dave Frank plans)
1983 Renault - 1/10th scale
1971 Hallmark Homes - 1/10th scale
Insane Fe30 - LSH
JAE21FE Rigger

The Atlas was initially build by another modeler and I did some rebuilding work. The 1990 Oberto was pretty much ready to run and just needed new hardware. The other 1/10th scale boats were all scratch built from plans.

The Elam/American Spirit sunk and was lost in testing and so a model of the 1993 Twin Wing Circus has been built from scaled down Roger Newton...Continue Reading