poor first flight

[Rhondas]

anyones help :confused: , my first attemp,I tried to ROG maybe 3mph wind and almost but it just didn't lift, so I waited for some wind the next day to perform a hand launch at a 10mph wind and it went up and to the side and down ,the wheels broke and the front prop but the rotor had no damage, it seems it didn't have enough power or enough lift? I really felt better with the ROG, should I put a bigger motor and battery ,more weight not good, or make the blades wider at the trailing edge.

[mnowell129]

1) How much does it weigh?
2) What is the rotor diameter?
3) What is the disk loading?
4) How many watts is the engine?
5) What prop are you using?
6) What is the pitch setting of the main blades?
7) Are the blades weighted?
8) Are the blades free to flap or semi-rigid?
9) Where is the CG?

[JWarren]

Mickey,

Rhondas, is trying to fly one of your designs, I believe. The gyro looks good, with a few mods made (not the same hub/head). Maybe you can help.

John

[Rhondas]

1) How much does it weigh?
2) What is the rotor diameter?
3) What is the disk loading?
4) How many watts is the engine?
5) What prop are you using?
6) What is the pitch setting of the main blades?
7) Are the blades weighted?
8) Are the blades free to flap or semi-rigid?
9) Where is the CG?
18 oz weight
30 in DIA x3 blades
3.88sq ft
speed 400 brushed 8 cell 600AE battery
gunther push on 5x4
2 degree neg
weighted ends blades
semi rigid flapp
cg 2 degrees nose heavy

[mnowell129]

Before anything else can be done more power is needed.
18 ounces needs 150-175 watts in a brushed setup.
8 cell nicad is ~9 volts under load, yielding a current
requirement of 16 to 20 amps. Something neither the speed 400
nor the battery are capable of.
Second the 5x4 prop cannot generate enough thrust to
fly this model without turning 30K+ rpm. Please don't argue
that this motor works on your airplanes. Gyrocopters need large
amounts of thrust at low speeds to fly.
You need a power package capable of turning an APC 12x6 SF or
equivalent somewhere in the neighborhood of 6000-7000 rpm.
An 18 ounce model needs 18 ounces of thrust to fly/climb with
any kind of authority.
The RCU thread regarding my model of slightly smaller size lists many engine and battery combinations that work. See if you have one.
The L/D of the gyrocopter is about 1:1, this means you need thrust roughly equal to weight as a rule of thumb.
For electric I use 100 watts per pound (brushless) as a rule of thumb, 150 watts per pound (brushed). This also has to be matched with a large diameter propeller for low speed thrust. I am flying a 12inch prop on a 32 inch rotor.
Other problems will be addressed when you have sufficient power.

[Rhondas]

Before anything else can be done more power is needed.
18 ounces needs 150-175 watts in a brushed setup.
8 cell nicad is ~9 volts under load, yielding a current
requirement of 16 to 20 amps. Something neither the speed 400
nor the battery are capable of.
Second the 5x4 prop cannot generate enough thrust to
fly this model without turning 30K+ rpm. Please don't argue
that this motor works on your airplanes. Gyrocopters need large
amounts of thrust at low speeds to fly.
You need a power package capable of turning an APC 12x6 SF or
equivalent somewhere in the neighborhood of 6000-7000 rpm.
An 18 ounce model needs 18 ounces of thrust to fly/climb with
any kind of authority.
The RCU thread regarding my model of slightly smaller size lists many engine and battery combinations that work. See if you have one.
The L/D of the gyrocopter is about 1:1, this means you need thrust roughly equal to weight as a rule of thumb.
For electric I use 100 watts per pound (brushless) as a rule of thumb, 150 watts per pound (brushed). This also has to be matched with a large diameter propeller for low speed thrust. I am flying a 12inch prop on a 32 inch rotor.
Other problems will be addressed when you have sufficient power.

Thanks so much I kinda thought that was the problem,Ill check out your thread