your own 1/12th Scale Sport Hydro.
Itís easy and inexpensive.
recruited Larry to write this article for Rum Runner Racing following his
successes at the 1999 NAMBA Fast Electric Nationals. Larry raced his 1/12th
scale sport hydro and set a new 4 lap speed record of 50:47 seconds. Larry built
his boat from RCBM plans. Larry constructed his boat from balsa and plywood. The
boat looked marvelous and performed even better.
bottom line is, anyone can enter Fast Electric Boat racing. Even if you are on a
tight budget or prefer to build your boats from scratch. Rum Runner recommends
the Dave Frank Design. We are
convinced that anyone can build this 1/12th scale hydro for under $50.00US (not
including hardware, motor and electronics') and be a winner. Thanks
Larry for contributing.
Dave Frank O Boy Oberto 1/12th sport scale hydro is one of the fastest P Sport
boat designs available today. The interesting thing about this hull is that it
is not available from any manufacturer. You have to scratch build it yourself.
Perhaps in the future someone will build this hull from epoxy or carbon fiber.
boat is constructed of balsa and light ply and is a fairly simple hull to
construct. I recommend that you purchase the construction video along with the
plans. The designer will show you step by step how to build your own winning
hull is the brain child of Dave Frank. Dave is a gentleman who was prominent in
fast electric racing in the early 90ís. He has since retired from fast
electric racing and I believe still lives in the Washington State area. His hull
designs were on the cutting edge at the time and as I can attest are still a
winning combination today. The basic design of the 1/12 sport scale O Boy Oberto
was pulled from his own 1/16 scale design. From this he made it larger, made
some modifications to the sponsons and with a lot of research and development it
evolved into the hull I use today. The boat is 28 1/4 inches long and 13 3/4
inches wide. This hull is very stable and extremely good in the corners. The
hull held many records in the APBA and if compared to the NAMBA records some of
them would still stand today.
construction of the boat is easy. The building plans are full size and has full
size part templates that you cut out. These templates are then positioned on
each piece of wood. You simply cut them out with a blade. This makes the part
construction virtually error free. The rest of the pre-construction is simply a
matter of cutting out predetermined sizes of light ply. What really makes the
construction of this hull easy is that Dave made a wonderful construction video
in which he takes you step by step through the construction process. The plans
are very detailed and if followed through completely, you will have a fail safe
method for construction.
will see that the sponsons are each different. So you must follow the plans,
exactly. The right side and left side are completely different and if the plans
are not followed it will give you less than desired results and performance.
materials cost was roughly $50.00 and the time to construct is variable
depending on how much time you have to donate to the project. I constructed mine
over the winter months at my leisure. The Dave Frank O Boy Oberto design is
definitely designed for speed with 12.5 second lap times and a 4 lap time at 50
seconds. Combined with minimal cost of construction this a hard combination to
and hardware. The Plans show the boat set-up with a dual motor Hughey Gear drive
and Hughey Hardware. This is a very successful combination and no doubt a fast
way to go. I decided to vary from the plans and use an Aveox 1412 1 1/2y for my
boat. I just like the Aveox motor and use them in most of my boats that are 12
cells or above. Then I choose Fuller Fast Electricís hydro hardware for my
boat. I followed the set-up and rigging instructions exactly as Dave Frank
suggests. Be careful to get the balance points correct. This will make a big
difference with your boats performance.
Set-up and Hardware used
Radio Control Boat Modeler Magazine. https://www.rcstore.com/storeindex.asp
Balsa, Plywood, CA and Epoxy. Under $50.00
Fullerís Hydro Running Hardware Kit. Price: $90.00.
Aveox 1412 1 1/2y. Price: $170.00
Aveox M160CM. Price: $225.00
Octura M447. Price: $12.00
Hi Tec FM. From: $99.00
HiTec 225 MG. Price: $50.00
Ordering supplies on-line
for your 1/12th Scale Sport Hydro.
1. Balsa and plywood. http://www.midwestproducts.com/woods.htm
2. Running Hardware. Rum Runner
recommends you contact Fullerís Fast Electricís. Fuller sells
the complete line of Fuller and Hughey hardware. Another very reliable
source is Superior Hobbies, They also represent both lines.
3. Power. The Dual Hughey gear
drive can be purchased from Fullerís Fast Electricís. In the event you
are seeking the Aveox motor and controller, Rum Runner recommends; Rogell
R/C Marine or Fullerís.
4. Radio and Servoís. Rum
Runner purchases our FM HiTec Radioís and Servoís from Superior
Hobbies. Contact them directly for pricing.
5. Batteries. For racing, you
will want professionally matched batteries. Rum Runner uses select
batteries from Fullerís Fast Electric, Superior Hobbies, or Fine Design
Manufacturing. Fine will soon be on-line for ordering.
you like to race Larry and his homemade 1/12th Scale Hydro? Larry will be at the
Spring Splash race in Seattle, Washington. The race will be held on June 9, 10
and 11, 2000. Register today. Click Here.
invites you to join a Fast Electric R/C boating organization. Why be left out.
Join in the fun. Larry is a member of NAMBA (The North American Model
Boat Association). The leading organization for oval fast electric racing.
article was written exclusively for Rum Runner Racing by Larry Larson. Use of
this article is strictly prohibited without the prior written permission of Rum