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I'M HAVING DRONE ENGINE TROUBLE!!!

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cdev:
Is there any reason you cannot build and use a conventional RC aircraft design? (not a rotorcraft based one) Fueled by gasoline or kerosine or whatever they use. Batteries powering the electronics. Reason, lots more energy for a given weight. Also, by using a regular winged aircraft design you'll immediately gain a great deal more range, flying time, etc. over a quadcopter, at the cost of needing a runway to take off and land and a lot less maneuverability. You'll also lose the ability to hover at a specific spot in the sky or take off or land vertically.

james_s:

--- Quote from: beanflying on January 10, 2019, 01:02:42 am ---I suspect long before death and dismemberment the $20-50k+ wallet shock to build it may ring some alarm bells before it gets to leaving the ground and if the CAA lets that happen either.

What Drones or are not to people is misshaped by the media and junk mail sub $100 ones in glossy colour.

--- End quote ---

I bet it could be done for a lot less than that, especially fixed wing. I know guys who fly 1/4 scale RC airplanes, both electric and gas and some of those could probably carry 80 lbs, especially if the craft was custom built for the job. Ignoring whether it's a good idea to try, I bet it could be done for less than $2k, possibly much less with enough ingenuity and a scratchbuilt airframe. Large wings with low wing loading, lightweight construction, sufficient structural strength to carry the load. Carrying much of the water in the wing as is done with fuel in full scale airplanes would greatly reduce the required structural strength although that comes with its own challenges.

beanflying:
Likely 100-150m long well prepared strip is the major problem. In particular if the plan is water for emergency supply at a goal point just simply not practical. Twin 60-100CC petrol engines 4-5m wingspan would be some very rough ideas on scale. Ground roll and speed on landing even with brakes loaded would be brutal likely to be over 100km/hr.

If you want time over a target or out and back to a particular prepared location fixed wing aircraft are the way to go.


--- Quote from: james_s on January 10, 2019, 01:50:49 am ---I bet it could be done for a lot less than that, especially fixed wing. I know guys who fly 1/4 scale RC airplanes, both electric and gas and some of those could probably carry 80 lbs, especially if the craft was custom built for the job. Ignoring whether it's a good idea to try, I bet it could be done for less than $2k, possibly much less with enough ingenuity and a scratchbuilt airframe. Large wings with low wing loading, lightweight construction, sufficient structural strength to carry the load. Carrying much of the water in the wing as is done with fuel in full scale airplanes would greatly reduce the required structural strength although that comes with its own challenges.

--- End quote ---

See above for some of the problems. 1/4 Scale WHAT? I bet you are wrong on your $2k too  ;)

Scale of 1/4 is 1/64 volume and weight so if you pick say a Piper Pawnee as it is used as a water/chemical carrier it will carry about 500kg of payload that works out to be under 8kg at a 1/4 scale.

Mckinney161107:
Do you have any recommendations on starting small scale

beanflying:

--- Quote from: Mckinney161107 on January 10, 2019, 04:24:32 am ---Do you have any recommendations on starting small scale

--- End quote ---

If you continue to ask vague questions you are going to get getting vague answers. Small scale what? Lifting thimbles of water or a general drone to learn to fly or to shoot video with? Indoor or Outdoor? Give a budget?

Happy to help but you need to provide something to work with.

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