Yea thanks Andrew better send me a copy.
I won't have an electric ready for BOB but I'll sure get one ready for next meeting.(plus you already have plenty for hydros)
I've also attached an areial pic of our facillity in Sunny Yarrawonga /Mulwala.
I've also got a meeting with the race commitee to disscus you rule alterations.
DRAFT PROPOSAL
AUSTRALIAN MODEL POWER BOAT ASSOCIATION ELECTRIC SPECIFIC RULES
Italic text are explanatory notes and not part of the draft proposal
17.1 INTENT AND DEFINITION
To establish a national standard for electric motored model race boats.
17.2 POWER / MOTOR SPECIFICATIONS
17.2.1 POWER AND SAFETY (Rule changed to allow current cell technology and safe operation of same)
1. Allowable chemistries are
* Nickel Cadmium (Sub-C size ie 23mm diameter)
* Nickel Metal Hydride (Sub-C size ie 23mm diameter)
* Lithium Ion
* Lithium Polymer
2. Any charger used at a meeting of any sort must be specified by the manufacturer as suitable to be used with the cell chemistry being charged or discharged;
17.2.2 MOTOR CLASSIFICATIONS
1. 700 Class motors are Mabuchi 775 or Johnson 785 motors which have not been opened. Accomodates existing practice
2. An Open Class motor is any electric motor.
17.2.3 MOTOR CONTROL
1. A model must have a means of starting and stopping the motor via radio;
2. Models using lithium, cells must have a low voltage cutoff device to prevent over discharge of lithium cells (safety)
17.3.1 700 & 700 PRO CLASSES
(Lipo is imminent. 700 mainly offers improved acceleration and corner speeds and handling. Lipo packs of 4s (3700) and 5s (2500) will be on the market by XMAS for under $200 – these will be 20-30c packs, weigh half a nickel pack , capable of running a 700 or 700 pro.)
1. A class designed to promote equitable and inexpensive competition, based on a 15v power pack and Mabuchi 775 or Johnson 785 motors.
2. Table 1, (below) sets out the hull power and motor combinations allowable
TABLE 1 Volts and cells for 700 classes
MOTOR-> ...................700...........700 Pro
HULL...............Volt...Nickel/LiPo...Nickel/LiPo....MOTOR
Mono...............15........12/4............16/5..........Mab775/Joh785
Rigger.............15........12/4............16/5..........Mab775/Joh785
Tunnel.............15........12/4............16/5..........Mab775/Joh785
Hydro..............15........12/4............16/5..........Mab775/Joh785
17.3.2 POWER CLASSES FOR OPEN MOTORS
(Simple class structure to provide inexpensive entry level classes; improve fit with NAVIGA ie 15v = Mono/Hydro 2 and 26v=mono/hydro3 classes; and take advantage of higher power input of commerically available electronic speed controls.)
1. Table 2 (below) sets out the nominal voltage (taken from specifications published by the manufacturer) for each power class. Each class is benchmarked against an internal combustion engined class. This is not intended to indicate parity in 2005/2006 season but rather the situation reasonably considfered to prevail by the 2007/2008 season.
TABLE 2. Motor Class and voltage/cell count
CLASS........Nickel Cells.............Lithium Cells
..............(XseriesYparallel)........(XsYp)
700.............12s1p.......................4s1p
700 Pro.......18s1p.......................5s1p
15v.............12s1p.......................4s1p
26v.............20s1p.......................7s1p
48v.............40s1p......................12s1p
48v*2.........Up to 40s2p.............Up to 12s2p
17.4 HULL SPECIFICATIONS:
17.4.1 OPEN MOTOR CLASS
1. Hulls using open class motors will unless noted, conform to
the specifications of Sections 7 (ie hull shapes)
2. For Scale Hydros; with the exception of 1/8th Hydro which will
run up to 48v:
a. 15v class will be a minimum 28” long ie 1/12th
b. 26v class hulls will be a minimum 35” long ie GP7.5cc
c. Hydroplanes from any class of racing may be used as the
basis for these models;
d. In other respects the hull will conform with Section 19:
Grand Prix Hydro 7.5cc
e. 48v motored scale hydroplanes will conform with Section
13: 1/8 scale Unlimited Hydroplane
17.5 RACING:
17.5.1 OVAL RACING
1. Section 8 of the Official Rule Book applies with the following exceptions:
i. In addition to the 300 and 250 metre ovals described in Appendix 1 of the Official Rule Book Electric races may be run over 10 laps of a 150 meter oval.
17.5.2 HEAT LENGTH
1. The race length for all classes is 1.5 km
17.5.3 RACE STARTING PROCEDURES
1.it is recommended he be started under Section 8.3.2 Clock Time: 5, 6 & 7 of the AMPBA Competition Rules.
(Basically boats can do a half course mill after launch prior to end of pit time till 10 seconds prior to the start – this integrates starting with existing procedures)
3.Generally the race will proceed under Section 8.7.1 Regulation Courses parts 1-7 except where the shorter 150m course is used and the total and minimum laps will be increased to 10 and 6 respectively. .
(This means electrics run the same laps as nitro and petrol on the same sized course and there is a shorter course for smaller ponds – but races are same distance to minimize setup change between large and small courses)
In summary:
* 5 main rigger & mono classes 700/pro 15v 26v 41v and 2*41v
* 3 Scale hydro 700/pro, 20cells; 32 cells (1/8th)
* 2 Outboard Tunnel 700/pro 20cells;
* 2 Offshore/Inboard cat 700/pro 32 cells
* Allows current commercial cell chemistries
* You get entry classes which can be adapted to run in the 15v/12 cell open classes as is mooted for Mulwala in 12 cell mono ie you get an upgrade path for little money
* Main thrust is to migrate electrics toward similar hulls and performance levels already popular in RC marine competition
h34r:
