healthyboy.... i suggest you try and keep this project nice and simple. I don't know what your time frame is,but i agree with you professor, buy a ready-to-fly rc helicopter and alter it to suit your needs.

I you could use three motors and use servos to angle the whole motor to acheive a forward motion and so on.

I think you are trying to run before you can crawl.

Baby steps, baby steps.

There are people who spend years trying to perfect this type of stuff.

Also i think there is such a rc on the market but with four props insted of three.

Search around and again don't try and complicate things.

well .. i'm sure you're right .. but the whole point of the project is to build the model ourselves ...

the professor didn't tell us to buy a ready-to-fly .. and he surely wouldn't agree to that .. but he did tell us to buy a remote control system .. since our study doesn't concern electronic control systems ...

Well, you haven't defined the project sufficiently. So far we know you can buy the Tx/Rx, have a budget of $500 and it has to be something you construct. Any limitations in materials? Do you have to build the motor/engine and carve the props? Do you have to wind the motor from wire and a core you fashon from bar stock? Are you allowed to buy servos to actuate the control surfaces or do you have to fashion actuators yourselves? Can you purchase the batteries or do you have to make them from basic components? Just how much can be wallet vs. drawing board? Length of expected flight time? Does it have to lift weight or maneuver in some specified fashion? Is there a certain payload required?

Keep it simple - Occams Razor - the best solution is the simplest one.

You can use rubberbands to fly some pretty large and sophisticated designs and put the budget into smaller flight components if it just has to get up and down on an "X".
I have a friend that takes off and lands a profile electric that he places nose-up on a chair and lands in the same chair by hovering it down. Would that count?

actually we CAN buy the motors .. but we have to carve the props ourselves .. there will be a payload with a certain weight .. but we have to calculate the thrust first .. such calculations comes from 2 places .. the prop design which we can manipulate it the way we want .. and the motor effeciency .. and that's what i'm asking about ...


i need your advice about a high effeciency motors that can endure high maneuvers ...


flight time is not important at this time .. and we can buy the battery too ...

healthyboy....you seem to be going about this all wrong.....you need to know the approx. wieght before you buy the motors adn design your props.
Getting a bigger battery adds weight.

Your seem to be going around in circles and not really concentrating on the important issues.

Have fun. Because all this advice doesn't seem to make a difference for you. There are hundreds of motors on the market from $10 to $300 each have their own specs.

It's harder to learn from other people mistake than your own. and most people don't want to learn the hard way.

Sorry for being so blunt earlier. What is it the professor wants in the end result, to see if it works? To see if it flys or see if it works and flys? I have not offered any tips because there is nothing yet to offer on. No end result here. To ask a group to build an RC VTOL with absolutely no rc experience at all may have well asked a group of 3 year olds to do it. They don't have any more idea than your class. Your skipping over the entire rc process and going for the gold and its not going to happen.

From what I know up to this point my theory still stands. If my son who is also in the master program in engineering told me he was assigned to build and rc plane, i would not start him off in a Turbine.

you need someone who has RC airplane and heli experience to fly a VTOL

guys .. i really appreciate your concern .. but you still don't understand what i'm saying ...

in the aircraft industry a major airplanes manufacturer like Airbus makes its whole airplane .. starting from the wings to the fuselage and the tail, and the landing gears and so on .. but they never manufacture an engine .. instead they buy it from an engine manufacturer like rolls royce ...

it wouldn't matter for us even if we had to control it using wired control .. but rc controls seemed the type of controls that made sense for a plane ... i keep asking you guys about how to choose an engine but you still answer me about something else ..


just like rolls royce .. our main concern is the motor .. anything else is irrelevant ...


you've cleared up alot of things for me guys .. but my main question is still unanswered ...

If I had to do it I would take an overpowered 3d aircraft and build a light 3 or 4 legged landing legs that would fit around the tail. Take off would be easy and then you could hover it down for a landing. IF you want information about selecting motors and batteries you should go over too the electric flight forum, they know more about electric requirements then this forum. Electric is a tricky thing there are considerations for cooling loading and duration which are all interrelated. Durations need heavier batteries which cause loading to go up which creates more heat that has to be dissapated so things don't thermal overload. Flying will be a challenge on a trainer let alone a vtol. Those planes require fast sure responses with a lot of finesse. A basic Radio might not have the capabilities you need to operate an aircraft like this (4 channel is about $125) a cheap computer radio is nearer to 250 with reciever and servos and all. IF you make a 3d type aircraft you will need large control surfaces to control the plane at low speed in flight and direct prop thrust. you could link the motor section to tail and wings using light aluminum tubing since this plane is for concept you do not need large surface areas for lift during knife edge. this will save you weight. If you could slide the wing up and down the fuselage tube you could control the cg without having to add weight

http://www.moller.com

http://en.wikipedia.org/wiki/V-22_Osprey

just to stimulate the mind...

Healthyboy,
You are at the doctor's office and tell him you hurt, but cannot tell him where or when you hurt, you just hurt.

How can he fix you?
This is what you are doing to us.
I am not currently in a flight dynamics class, nor do I plan to be in the near future.

I know that plane manufacturers do not produce their own engines.
This is the case in model aircraft too.
If I contacted the manufacturer of model airplane engines, and stated that I needed to make a plane go vertical, they would ask the same questions as have been asked already in this forum.

You need to supply us with more information than you have.
Simply to recommend an electric motor for the sake of just having one, you can go to http://www.towerhobbies.com and just pick one.
If you want something to do the job correctly, you need to supply more information.

Weight -
How many motors -
Flight duration -

These are just a few of the things that we need in order to help you.

We are ALL here to offer opinions and assistance, but we cannot blindly say this is what you need without you stating what you are planning.

"I want to make a vtol" leaves it WIDE open.
Under $500.00 on electric, maybe not... unless you get a Helimax C/P and modify it to your liking...

Everyone that I have seen respond to your posts is willing to help you, but you have not provided enough information for them to do so...

If you can answer their questions, then you will get an answer...

Can you provide a link to your project requirements?
That may help a great deal.

Bob