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Old 09-29-2021, 09:17 AM
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im part of a university team that are doing a project, designing a model plane.

We are looking for advice on the general size this would be and recommended design help. We don’t know much about the electronic system on the models. We have the thought that it will be a Cessna 172 type of layout to achieve a stable flight characteristics.

the remit is as below any help would be appreciated.


The aircraft must be fixed wing but otherwise the configuration is free.
• There is no limit on wingspan.
• The power system will comprise one 4-Max PO-3541-1070 motor and 4MESC50A speed
controller and a 3 cell Lithium Polymer battery of 2200 mAh capacity.
• The electrical circuit must include the specified isolator wired such that the motor cannot be
run with the isolator removed.
• The aircraft undercarriage must enable operation from a grass runway.
• The motor must be used as direct drive (i.e. no gearboxes) and propellers must be of fixed
• The specified “isolator” (fuse unit) must be fitted in order that the motor and speed
controller can be isolated from the main power supply for the purpose of safe payload transfer, the “isolator” must be mounted in such a location as to be readily accessible by team members and also easily visible to marshals.
• Additionally, the Isolator unit must be located a minimum of 100mm from the propeller arc and orientated so as to promote removal of the fuse predominantly away from the direction of the propeller arc (25 degree minimum). It is important that the unit is affixed to a suitably sturdy area of the airframe in order to prevent damage when fitting or removing the fuse.
• A propeller spinner or rounded safety nut must be fitted on forward facing motors.
• The payload must be able to be removed/detached from the aircraft and cannot form part
of the structure.


Control of the aircraft will be by means of radio control operating on the 2.4 GHz waveband.
• The use of gyros and auto-stabilisation is permitted.
• The pilot must be able to return to manual control at any stage of the flight.
• The system must include an operating Failsafe facility.

Radio Restrictions

• Radio control will be used to fly and manoeuvre the aircraft.
• Radio installations will be scrutinised by the organisers and must be deemed fit for the
intended application. Contestants must ensure that servos and linkages are capable of
handling the anticipated air loads.
• Computer transmitters are permitted, however any extra functions (such as wheel brakes),
mixing or advanced programming must be explained and demonstrated during the
presentation to the judges.
• The use of gyros/auto stabilisation is permitted, however any aids to stable flight must be
able to be overridden by pilot command at any phase of flight.
• Equipment on the 2.4GHz band only.
• All radio equipment must be UK/Mauritius compliant.


Michaeld8933 is offline  
Old 09-29-2021, 06:26 PM
homo ludens modelisticus
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Join Date: Jul 2005
Location: near Nijmegen, Nederland
Posts: 1,343

Some well-structured reading for rainy/windy days, including e-flight_101 & 102, and some handy e-tools.
Will save you, and us a lot of questions. Notably the 'what went wrong?' kind of questions
Will also prevent you from burning up several controllers and/or motors and/or battery:
E-flight primer and tools

And pleasepleaseplease, do your RC equipment, wallet, ego, battery, controller, motor, house/garage/car a big favour ... get a watt-meter.
It will more than pay for itself, will save you at least one fried motor and one fried controller. Will also help you finding the best setup and help you troubleshooting. A must have.
ron_van_sommeren is offline  
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