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(Pages B-30 (revised 1998) and B-31 (revised 1996)) and are the copyright of IMPBA. These rules are for informational purposes only for boaters who are interested in building a 1/8 scale hydroplane for competition. For more information and the latest updates of these rules, click the link and go to the IMPBA website. Join the IMPBA today! 
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Section 2 - Scale Unlimited Hydro Rules
The purpose is to realistically duplicate the Unlimited class of Hydroplanes
A. Function of District Chairman
1. Responsibilities
a. Coordinates
registrations for his district
b. Has the
power to appoint a committee to resolve protests
c. Overseas
the operation of scale hydros in his district and assists IMPBA
in scale hydro matters
d. Keeps
point record for district high point trophy
When vacancies occur, this position will be appointed by the current District
Director
and the National Scale Hydro Chairman.
B. Registration Procedures
1. All boats must be registered with the District Chairman
2. The District Chairman will require the following
information in writing:
a. Name,
address, and phone number
b. IMPBA
number
c. Unlimited
name, year raced, and number
d. Length
and beam of unlimited prototype boat and model
e. Prototype
designer and boat colors
f. Must submit
a photo of prototype boat
g. $5.00
initial registration fee and a $3.00 annual renewal fee due by March 1.
The
registrant will receive a District Chairman approved form verifying current
registration.
Approved form must be brought to all contests. Purpose of fee-monies will
be used for
high point district trophy, postage, printing costs, and other expenses
incurred.
3. Boat must compete at a racing event within one year
from registration.
C. Engine and Boat Specifications
1. All boats to be modeled after
Unlimited hydroplanes from the past or present.
2. All boats to be built to a scale
of 1 1/2" to 1'0" (1/8 scale) plus or minus 10% of the beam
and 5% of
the length.
3. Boats will look as scale as possible
and meet the following requirements for racing and scale judging.
a. Cockpit
with driver.
b. Complete
all major lettering and paint schemes
c. Effort
must be made to conceal glow engine with fake engine or cowling as per
prototype boats
4. Hull bottom and running hardware
will not be judged or checked. However, hull must not deviate
from conventional
3 point hydro (unless prototype was a different design).
a. Hull bottom
must be scale appearing.
b. Belly
pans are acceptable to clear engine and/or flywheel.
c. Secondary
front sponson running surfaces are optional.
d. Air traps
are optional.
5. Engine must correspond with I.M.P.B.A.Class
"E".
6. Boat shall use same number of
propellers as the prototype.
7. The drive dog must not extend
beyond the transom unless the boat did so.
8. No twin rudder assemblies allowed.
9. Boats should have the ability
to change frequency.
D. Rules for Optional Scale Judging (Concours)
1. Boat must accumulate 50 points
in racing to qualify for scale judging.
2. Judging points to be separate
from racing points.
3. All boats are to be judged no
closer than 10 feet.
4. A picture must be submitted for
the scale judging.
5. Points as follows:
1 to 10 overall
scale appearance
1 to 10 for
detail, engine, cowl, driver, etc.
1 to 10 for
paint job, markings, etc.
1 to 10 for
construction
E. Racing Rules
1. Normal IMPBA driving rules will be followed.
2. Only the registered owner can
race his unlimited.
3. All boats shall run 3 qualification
heats. There shall be no more than 6 boats to a heat.
4. At the conclusion of the qualification
heats, the top 5 boats, based on point total,
shall go
into the final.
5. To get the 6th boat for the final,
the next 6 boats, based on qualification heat points,
shall compete
in a consolation race with the winner going into the final. In the event
that the
boats that have a tie are in 5th place, both boats go into the final and
the
final field
of 6 boats is established.
6. Heat races will be 6 laps in length
and will follow standard IMPBA starting procedures.
The last
boat running rule may be used, except at the International Regatta.
7. Frequency choice will be made
in the point system. If a frequency conflict appears,
the boat
with the higher points will have preference. If the conflicting boat does
not wish
to change
frequency, it will be put in the consolation race and all other boats moved
up.
8. Main Event and Consolation race
points do not count toward the seasonal high point awards.
9. Season points accumulated in racing
will go to registered owner at the time of competition.
10. Cutting a buoy on the inside
before and during the race shall incur a one-lap penalty.
Hitting
a buoy on the outside at any time shall incur a 50-point penalty.
Cutting
a buoy after the race is over will incur a 50-point penalty.
F. Records
1. Records shall be established in
the Scale Unlimited class as per rule G-5.
2. Only boats properly registered
will be eligible to establish records.
3. Only the registered owner can
attempt to set a record with the
registered
Scale Unlimited.
Join the IMPBA today!
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