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cyberhoops's blog
Posted by cyberhoops | Jan 23, 2009 @ 11:56 AM | 2,871 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 | 3,182 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 | 2,670 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 | 2,662 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 | 2,862 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
Posted by cyberhoops | Jun 26, 2006 @ 05:39 PM | 5,590 Views
With appropriate credit to Mirco Pecorari for the artwork of the design itself - I scratch built foam version of the GeeBee R3, which I labeled a GeeBeeX.

I was only working from the profile view of Mirco's GeeBee R3, so the wing shape and tail feathers are no doubt not what Mirco had in mind. Also - for weight considerations I made it a hand launch plane.

It is 30 inches long and has a 36" wing span. All up weight right now is 19.2 ounces.

It is built from EPS and Depron, powered by the Ultrafly Frio E/10/10 motor with a 2100mah 3 cell lipo, an Eflite 20amp speed control and a Berg-6 GIII receiver. It has a total of four HS-55 servos for the ailerons, rudder and elevator.

The body is a center section of 6mm Depron, cut to include the vertical stabilizer. The rest of the body is 0.5 inch EPS foam stacked into 2 layers on either side of the Depron and then sanded to shape. That made it slightly more than just a profile plane, but somewhat less that a full 3d body. The elevator and rudder are also 6mm Depron.

The battery, radio and speed controls are mounted into slots on the right side of the body and basically flush to the surface.

As for flight characteristics ... I am going through the trimming process now, but it will do all of the standard aerobatics and flies quite nicely.