Where Do I Start wen building a VTOL

[Osprey WannaB]

I am Very interested with all the V-22 Osprey Projects that I have seen...
The only thing is i don't know where to start :confused: I realy want to make an electric osprey... SO can any1 help me by telling me where to start on this project?? :D :p
Regards,
Jamie

[Lewist]

i would suggest building a test rig to try different designs and setups until you find one that works, then start building the model.

If you read all the other V22 projects you should find enough information to start.

[Osprey WannaB]

Okay I have read all the other v-22 projects and have an idea of wat i want to atchieve. so my first thing I'm going to do now is... do some testing...
I have my engines i'm wanting to use and all i need is a material.. i'm thinking of foam or balsa wood..

[MustangAce17]

when i did my VTOL loosely based on an Osprey,i just bashed a GWS Islander and it seems to work since i can get frward flight,but still trying to takeoff vertically check out the thread for any info

[Lewist]

try using some balsa to bash tongether a test rig loosly based on the layout of the V22 then start testing. once you know where you are going with the overall design then you can start to make the proper version!

[v22chap]

Lewist or mustang are right ,,try to get a hover bird first and then start to work on the tilt conversion after that works. Don't try to do it all at once .. Most of us have been working with our birds for yrs.The more you do and read the more you will advance..The basic first step ,,,is to start ;) :D

[Osprey WannaB]

okay thanx guys...
I have start to Search around for the main parts i need, i should be able to start building in about 2 days.
Another thing...
I seem to be seeing is that no one can get there bird to do the conversion... wat are the main problems people have with this???

[Lewist]

As i understand it, one of the problems (please correct me if I am wrong) is that when you go to move the rotors, because of the overall forces involved with the spinning blades it tends to cause the body to move arround as well.

[rdresch]

Agreed, The only way I see around this is a low cg. That and enough forward speed so that aero forces on the tail help hold the model level. This is a bigger problem on scale models with large rotor diameters. The larger rotors increase the effect of gyroscopic precession dramatically. Everything is always a compromise. I hate compromise, just ask my wife. Maybe thats why she always ends up getting all she wants.
Rudy

[v22chap]

It does do that ,,but it is controlable in the larger cyclic controlled birds and even with Vtolmans airplane prop park flyer he was able to control it pretty good,,but like Rudy said the motor pod CG has to be keep low on the aiplane prop ones. The biggest problem in conversion is being able to see it happen when you are that far up and out and knowing when you have reached the right MPH to start it and the pilot being able to carry it out as it requires a lot of switch changes to shut off heli controls,, raise the flaps advance the throttle /collective ,and change rudder controls around for airplane mode ,,, and keep the bird level through all this .This is where Joe Orlandos (Model Tech Products ) TH-2GP is going to help out as it will be programable to help do all these things with less pilot work load.
The other big thing is keeping the heli / airplane's CG the same as it pivots into the other mode.This sometimes takes a lot of as Rudy puts it compromise ;) :rolleyes: :D
Larry

[Osprey WannaB]

Thanx For the info guys, it should help in the planing and construction.

i had on idea to stop the body from moving wen doing the conversion.
u could try having an extra wieght that slides forwards when changing flight mode.

[v22chap]

You don't really want to add any extra weight to these birds...as they are always to heavy already...now maybe move a battery pack ..something that has to be there already ...but I don't think this will work fast enough to do any good.You can get both CG's pretty close and live with the heli one hanging tail low a little,,,the real one does.

[rdresch]

Osprey Wanna Be,
The problem with the sliding weight is, first complexity. You will need sliding rails and mechanics, adds weight. Second, once you finish your transition where does that leave the cg? Normally as the rotor-pods move to the horizontal it will shift your cg to the nose. this is good for stability in airplane mode. I really think keeping the cg as low3 as possible below the center of rotation (the center of wing on a osprey) will have the biggest effect on stability. There is of course one caveat, if you get that mass swinging side to side you have a problem (oscillation).
Rudy

[Osprey WannaB]

Okay after saying that i did realise it would add more wieght, but.. it could work if u had it slide the batteries and after it does the conversions to slide back to even up the cg's.. i am starting my own dissusion of my own project very soon, it will explain wat i am doin and wat i have done... i will post a link here shortly...
thanx u for all ur surport

[rdresch]

Far as I am concered the only bad idea is one you you don't test. There have been more than one aproaches that I swore would never work, but they did. Go for it and have fun. Building it and overcoming all the problems is what it is all about.
Rudy

[v22chap]

Rudy ,,My exact sediments ,, you won't know until you try and all the figures will tell you no ,,but sometimes the figures don't know. ;) :censored:
Larry

[EyesOnly]

The figures are only as good as the one i makes them. As a well known fact about computers: craps in = crap out. Or so they say. :)