(Electric) Rotary wing

Sorry 1st. got Trashed about a Month after Finishing it.It only had a Thin Glider (Foam) wing. This 2nd. is Balsa Construction Much Stronger & Less prone to Warping!As soon as I have Funds for Rotor Head & Linkage I will get Busy putting it together.To much work to make it fixed again! Only to cut it in Half .When I get that part? The e.s.c.s are cheap enough, I have 2 New Typhoon 2W-23 motors! a Radio receiver and all 4 servos.I am putting a Battery in each wing.To limit the amount of Brushes from receiver in Cockpit to e.s.c.s Next to wing motors! I promise I will get a Video of it in Action Just give me some Time & a Winning scratch Ticket (I don't Play) Maybe you could locate some used parts? I have a couple of Hundred each Month to Spend.But, got Burnt by a Bank Teller Scary!

Rotor Head Tilts for Direction.No Torque, No anti torque!Control Sufaces Direct Axis! See Hiller Jet tip rotor blades on you tube. Bell & Hiller 1st video. About 3 seconds is dedicated to an Electric version with props. With just a Tail Fin for Axis control! Must see.It is a Very simple Machine & a Great lifter! I Hope to see it Built as a (Unit) that would use an E.V. as a Cockpit & Power supply.If you didn't notice? I changed direction of rotation.In my Haste to get it Built.I would up having to counter rotate motors & left handed props. To get correct Air flows.Air comes in & Slightly Over the Top of it's wing!The Hiller video will answer all your Questions! Mine is a New twist on an Old concept! That Worked like a Charm!!

"Rotor Head Tilts for Direction."

This isn't clear. The two main methods of directional control on single rotor machines are either by tilting the entire mast (which includes the rotor head) or by varying blade angle of attack through a swash plate. I can't tell in your pics which is the case.

"Control surfaces direct axis"

This is also confusing. Directing the axis is fine for forward flight, but how do you handle hovering or maneuvering in other than forward flight?

Also I don't see any stabilizer bars on the rotor head (those thingies that poke out 90 degrees from the main blades on two bladed rotor heads). How do you dynamically balance the rotor head at speed?

I guess I'm asking too many questions. I'll wait and see if you provide a video to try to understand your design better.

Hooker

Hooker

Do you mean a Problem with Brushes?

Yeah, dirt and corrosion problems. Helicopter flight environments tend to be on the harsh side, particularly in the Middle East.

I've seen aircraft literally taken apart, including the skin, to get that talcum powder grit out.

Hooker

If you look closely You can see Tilt servos I am going to Use a Real r/c Helicopter Head & Linkage on 2nd.1st also had Fixed pitch Wing.Lift was controlled by Wing motor r.p.m.s alone!Main rotor speed!I see you havn't been on you tube? Hillers had a Tail fin Which was Just a Control surface working off Downward Air flow! Bearing Drag is close to 0 A Good bearing will not Drag or Cars would not go straight! Tail fin was relatively small & worked Great for Axis control!Those rings are Bands of Copper Tape.Very little voltage goes threw those 3 brushes @ Hub Just volts from receiver to e.s.c.s Before it Splits to Both motors Battery wires to Motor are in Wing Battery for each motor is between 1&2 ribs!The Brushes are no Heavier than those for a Car Horn? Very light actually!

I don't need to be on youtube. In the last 50 years I've seen virtually every configuration of helicopter imaginable, including 12 years of rotor research at NASA and over 2000 hours of flight crew experience. (No, I'm not a helicopter pilot)

I have a lot of doubts regarding your design but I'm withholding judgement pending clarification of details. Also, nothing is proven until a rigorous flight test regime is completed, at scale. Reduced scale prototypes are nice, but often fail when scaled up to realistic proportions.

Best of luck. I'll follow your progress with interest.

Hooker

No The Batteries are Very close to the center of a 6' span! You shall see?I have some Dyeheadral Sorry about the Spelling.Which will also help Stabilize it.& There is More weight @ Center for c.g.I want to Limit the Amount of contacts @ Hub.Found Large scale Parts on Ebay should be Completed some.What is wrong with a Little inertia?

Just some ideas, if you don't mind. A "little inertia" is not a problem. But adding it to all the other dynamics affecting a rotor system and you'll soon find that a little can quickly get way out of hand.

Positive dihedral increases the stability of the of the rotor in the plane of the blades. But increased stability (along with inertia) also adds resistance to changing the rotor plane as you attempt directional control. And the added battery weight will probably not help. You need to maintain a rotor system that is as reactive as possible.

In other words you're going to have more trouble maneuvering the aircraft. Extra work for maneuvering is just wasted power, no matter where the work comes from. I'm assuming you want to use muscle power.

Also, as blade flex increases as load increases, dihedral adds to the level of the blade tip above the blade root. This can drastically affect drag across the chord of the blade and rotor tip vortices which will result in higher drag and corresponding loss of efficiency. This will not likely show up on your scaled down prototype but will become more apparent as you scale up. There's no such thing as stiff blades at scale, unlike your prototype.

Sorry, that got way more verbose than I intended.

Hooker

Curious to Know if you watched that Hiller jet tip rotor blade video There are 2. 1 shows Full scale Helicopter with Pulse jet tips Quite Large for a Blade But they Worked! The other video shows him Developing his rotor craft! His 1st happened to be (Electric)?But had no type of Flight controls at all?Just a few degrees of dihedral would have helped a lot! That video is very Impressive Hope you watched it.I started with Control line planes @ the age of 10 I also have about 200 hrs. logged in! So I know the Basics of Flight?I'm sure there are a Few different ways to do this Push or pull props. Tail Fin or Above hub control surfaces? Or like Mine on sides? I have to go with what I can? No shop or $$ to do above hub type or Tail Fin So, I chose this style? It works well enough for Demonstration! I found some large scale Helicopter parts The ones I (Need) cheap.All I have to do is put some $$ on my brothers credit card to get them.One bill is taking priority over that. But I asure you I will have it Finished sooner than I thought! I will get someone who Knows computers to Make a Video of it in Flight & put it on youtube.I need about 1 month & you'll have Something Cool to watch! Again Thanks for the Support!

Don't know where I left off But I found parts on ebay for short Money Everything I need!I'll have to by a couple of e.s.c.s for those Typhoon 2W-23 motors.Thought about changing But they are pretty Beefy! Not to Heavy & cost about 100.00 bucks each if I remember correctly?I have prop. adapters. Changing props.I should be Finished by the end of Next Month! By finding those Helicopter parts so cheap It is a Large scale About 52 inch span Hub with mounting bracket & Linkages.Want to make upgrade there!Putting a Battery near c.g. in each wing to power it's motor! E.S.C.s will mount next to motor! Getting the Brushes down to 3 Low voltage contacts From receiver to e.s.c.s before split to each side!This will be My Birthday Gift to Myself! A Video of My Mill in action!Or as some refer to as that Hoopy Heli.Might experiment with different motors Later? Going to Cannibalize a Car steering wheel for contacts & Brushes & adapt it to my Hub! Not Mickey Mouse contacts on 1st. They worked But, that's about the extent of it.Nothing Pretty to look at.#2 will be a Refined version & an easier Build all around.No Homemade Gimbel? Thanks for All your input! I really do appreciate it! Like I said before & Talk is cheap But, I (Will) have a Video made & on youtube by the end of Next month! Thanks again to all of you Charlie

Thanks I'll keep that in Mind! But, Tracktor or Pusher? I'm Happy with the Air flows I have Now! Found parts I Need Super cheap on Ebay & I have a Few Bucks to spend on the 1st. Got to Pay 200.00 to Keep this Computer That I Barely know How to attach a Pic.? I think the Hiller Jet tip Sold him on Control surfaces for anti-torqe! Unless the Main Bearing has a Problem the Drag in Minimal at Most!I will be Hooking Hooker up with a Video Very soon Batteries in Wing are between 1&2 Ribs.Just to ManyBrushes & I would rather have the Battery to e.s.c.s Directly powerd.3 leads are going from receiver to e.s.c.s before Split threw Brushes Low voltage! I think they are close enough to c.g. to Help with some Diheadral? Thanks for the Support!

Nope, I'm far from sold on control surfaces for anti-torque. The Hiller has extremely low load carrying capability at hover with that methodology.

Hooker

Click here for good reference video for rotor blade tip propulsion.

The above link is to a video showing a live flight of the Swiss designed Dragonfly DF1 H202. I think it may be more instructive than the Hiller videos.

In particular note the anti-torque rotor being driven from the main rotor. IMO this is the right way to handle anti-torque in a full scale machine that needs to hover under load. Some people claim that rotor tip propulsion designs don't need to worry about torque. They are wrong.

The only problem I have is with the full mast directional control. This gets very tiring very quickly and the last thing needed in a rotorcraft is a tired pilot. Flying helicopters is tiring enough and the workload needs to be minimized.

Hooker

It's Come a Long Way Since Then!