Auto Gyro with pre-rotator - Page 2

Axbri · Nov 15, 2009, 03:23 PM

Gyroguru, the big friction drive wheel is made of a scraped Honey Bee King II drive wheel. I have removed the one way bearing and the cogs with a lathe. I have also fitted the wheel with a rubber seal to increase the friction. I have used a drilling-milling machine and a lathe to make the rest of the parts from scratch. The motor for the pre-rotator is a Speed 280.

/Axel

derk · Nov 18, 2009, 04:37 AM

do you have the pre rotator motor on a remote switch, or is it a mechanical switch on the model?

Axbri · Nov 18, 2009, 01:17 PM

Derk, no and no. The rotor is started in this way:

A PIC12F675 microcontroller measures the control signals of the servos that control the rotor. If one of the control signals is close to one millisecond, and the other is close to two milliseconds (both servo arms are in their upper most position) the microcontroller starts to send pulses with about 60% duty cycle at about 200Hz. These pulses are sent to the input of an IPS031 power switch, which is connected in serial with the Speed 280 motor that spins up the rotor. I have programmed the microcontroller with assembler in MPLAB IDE which can be downloaded for free from Microchip.

/Axel

appy2day · Nov 19, 2009, 03:33 PM

Very nice project Axbri.
When I first looked at the pre-rotator motor mount, I thought you had used a spring loaded mount and a micro switch. Just push the rotor assy aginst the motor and it would start. Your setup should inspire some more per-rotator setups.
Thanks for your posts.

spitfire_Doug · Nov 21, 2009, 03:11 AM

Hi,

Axel, Thats a pretty sophisticated Pre-rotator. I use an external held motor.

Great little gyro you've built there.

Doug

PS: Im only 17 as well.

Axbri · Nov 21, 2009, 07:00 AM

Hello appy2day and Doug,

It is obvious that the pre-rotator mechanism can be made in many different ways.

Doug, I suppose you have summer now? At my place the sun just barley rises above the horizon. Do you use the tail elevator? Does the flybar help to stabilise the autogyro?

Regards, Axel

spitfire_Doug · Nov 21, 2009, 07:42 AM

Axel,

Yeah its summer now here, But I live on the coast, making it windy neally all day, every day.

No, no tail elevator. My gyro features a full swash plate head like a helicopters meaning the flybar controls the rotors, giving roll and pitch control. It must give some increase in rotor stability but I dont know exactly how much it would be.

Doug

Nov 18, 2009, 01:17 PM	#18
Axbri Registered User Join Date: Nov 2009 Location: Norrköping, Sweden Posts: 11	Derk, no and no. The rotor is started in this way: A PIC12F675 microcontroller measures the control signals of the servos that control the rotor. If one of the control signals is close to one millisecond, and the other is close to two milliseconds (both servo arms are in their upper most position) the microcontroller starts to send pulses with about 60% duty cycle at about 200Hz. These pulses are sent to the input of an IPS031 power switch, which is connected in serial with the Speed 280 motor that spins up the rotor. I have programmed the microcontroller with assembler in MPLAB IDE which can be downloaded for free from Microchip. /Axel Last edited by Axbri; Nov 18, 2009 at 02:30 PM.

Nov 21, 2009, 03:11 AM	#20
spitfire_Doug Registered User Join Date: Jul 2008 Location: Australia Posts: 55	Hi, Axel, Thats a pretty sophisticated Pre-rotator. I use an external held motor. Great little gyro you've built there. Doug PS: Im only 17 as well. Attached Thumbnails How it engages with the head 55.7 KB · Views: 36 The Pre-rotator 62.8 KB · Views: 21 The Gyro I use it on 137.4 KB · Views: 34

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Nov 15, 2009, 03:23 PM	#16
Axbri Registered User Join Date: Nov 2009 Location: Norrköping, Sweden Posts: 11	Gyroguru, the big friction drive wheel is made of a scraped Honey Bee King II drive wheel. I have removed the one way bearing and the cogs with a lathe. I have also fitted the wheel with a rubber seal to increase the friction. I have used a drilling-milling machine and a lathe to make the rest of the parts from scratch. The motor for the pre-rotator is a Speed 280. /Axel

Nov 18, 2009, 04:37 AM	#17
derk TheyreComingToTakeMeAway! Join Date: Dec 2003 Location: cda, Idaho Posts: 2,324	do you have the pre rotator motor on a remote switch, or is it a mechanical switch on the model?

Nov 19, 2009, 03:33 PM	#19
appy2day Registered User Join Date: May 2002 Location: Lakes of NH off RT 16 Posts: 185	Very nice project Axbri. When I first looked at the pre-rotator motor mount, I thought you had used a spring loaded mount and a micro switch. Just push the rotor assy aginst the motor and it would start. Your setup should inspire some more per-rotator setups. Thanks for your posts.

Nov 21, 2009, 07:00 AM	#21
Axbri Registered User Join Date: Nov 2009 Location: Norrköping, Sweden Posts: 11	Hello appy2day and Doug, It is obvious that the pre-rotator mechanism can be made in many different ways. Doug, I suppose you have summer now? At my place the sun just barley rises above the horizon. Do you use the tail elevator? Does the flybar help to stabilise the autogyro? Regards, Axel

Nov 21, 2009, 07:42 AM	#22
spitfire_Doug Registered User Join Date: Jul 2008 Location: Australia Posts: 55	Axel, Yeah its summer now here, But I live on the coast, making it windy neally all day, every day. No, no tail elevator. My gyro features a full swash plate head like a helicopters meaning the flybar controls the rotors, giving roll and pitch control. It must give some increase in rotor stability but I dont know exactly how much it would be. Doug