Hub Bars and Starter Motors

[asra]

Don't see any way to edit a post. Should have been 90º-270º.

[NiqueNaque]

So what happens when you go to five blades?

[asra]

Use as many blades as you like as long as they have separate flap/drag hinges.The use of tilt head cyclic control requires that flap hinges be on the center of rotation or as near as possible. Several tons of centrifugal force acting on each rotorblade resists tilt input with offset flap hinges.With 3 blades, the flap hinges can be arranged as a 3 legged star with doglegs of each hub link to properly locate the drag hinge on a radial line 90 degrees to its flap hinge axis.The hub would get pretty busy with 5 such hinges and links.Another factor to consider with multiple blades is not to go too low with blade loading. Rotor tip speed depends upon blade loading and top speed is limited to 35% or so of rotor tip speed.

[asra]

Those are a fascinating couple of posts Chuck, it all keeps bringing you back to what a great thing the teetering rotor is!By the way, you can edit by clicking on the icon in the top line with the pad and pencil - I have to use it a lot.John EvansThink logically and do things well, think laterally and do things better.

[NiqueNaque]

Chuck,No doubt you've seen delta heads, how do they compare or work in comparison to a conventional head in say a three bladed rotor?Cheers,Nick.

[pocky]

Just a dumb questionIn the thread of AN someone mentioned soft start I presume preroters.With all the talk of fatigue of the hub bar and torque twisting of the mast has anyone tried HYDRAULIC as a means of prerotating.Weight savings may be possible as well.Me thinks that if you used a power steering unit out of a vehicle preferably a small vehicle,attach air/con electric clutch to the pump which could be belt driven off the moter or maybe direct coupled and fitting a hydraulic moter to the mast head with either a overun clutch or some other means of disengagement.If you running a four stroke you could tap into the sump for an oil supply.The benefits is that you could run up the roters in the same manner as the friction drives without the heavy drive tube.If a pump with an inbuilt adjustable Relief valve was used it would be possible to make prerotating as soft or hard as you likeJust my thoughtsboundry rider

[pocky]

Thanks WozWouldn,t mind seeing his set up one dayboundry rider

[asra]

Here you go Pocky...Image Insert: 76.84

[pocky]

Thanks LloydVery interesting set up ,is the motor on the rotor head in constant engagement,also he has a fitted one hell of a hair dryer there(what HP)is he getting out of the sub.So we have options rather than electric for prerotors,boundry rider

[asra]

Looks great Lloyd, by the look of the colour, the seat frame, front mast support tube, and twin tails, is your gyro the converted Edge X trike ?How about a full photo of your machine ?In the above photo, it seems you have only one control rod attached to your torque tube, please explain ?Regards Sam. []

[pocky]

Thanks Woz,Had a closer look, it was the bypass pipes that made me ask,awesome looking unit and as sam asked more pleaseboundry rider

[asra]

Hey Sam,Its not my machine. It belongs to my instructor, Jeff Henley-Smith. As well as making gyros (See gyro news) he manufactures Advanced Kinetic rotors, a single solid extrusion, very tough. (dont think even Birdy could bust them). The front pod and seats are off a trike, but pretty much all else is custom.If I were to get a full photo of my machine, I would have to pile all the bits over to one side of the workshop. I still have at least 6 months to finish.As for the controls. The primary control is via flexible cable from the front seat. Jeff has made another control on the right-hand side of the rear seat so he can instruct. It uses a single push rod up the back, and another on the right-hand side near each of the flex cable ends. See second pic in previous post.Here is a shot of Jeff and me after my first flight.Image Insert: 67.26

[pocky]

Turn the outlet around and he woulnd,need the propboundry rider

[asra]

G,day.Where do I " See gyro news "Tar.Robert DunnMackay. Qld.Growing old is good while it lasts.

[asra]

Hi Robert,If you want to join ASRA you will receive the quarterly magazine "Gyro News" as part of your membership. If you want to subscribe to the "Gyro News" only that is possible too. Email me if you are interested in either option.RegistrarLlewellaA sceptic is a person who, when he sees the handwriting on the wall, claims it is a forgery.