SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Jun 06, 2008, 04:03 PM
Registered User
Mango's Avatar
Stockholm, Sweden
Joined Dec 2005
76 Posts
Discussion
Maximum

Hi.

Just wanted to show you my new autogyro that I call the Maximum .
It is a double size version of Jochens Micromum.
I'm not sure if it is going to fly because it is a bit heavy 1275grams
I will be back later with a report after the maiden flight.

/Magnus
Mango is offline Find More Posts by Mango
Last edited by Mango; Jun 08, 2008 at 04:39 AM.
Reply With Quote
Sign up now
to remove ads between posts
Old Jun 06, 2008, 04:51 PM
Registered User
PeterO_UK's Avatar
Joined Aug 2006
1,462 Posts
Quote:
Originally Posted by Mango
Hi.

Just wanted to show you my new autogyro that I call the Maximum .
It is a double size version of Jochens Micromum.
I'm not sure if it is going to fly because it is a bit heavy 1275grams
I will be back later with a report after the maiden flight.

/Magnus
God Luck ! But the motor and prop look a bit small to me.
PeterO_UK
PeterO_UK is offline Find More Posts by PeterO_UK
Reply With Quote
Old Jun 13, 2008, 03:57 AM
Registered User
Mango's Avatar
Stockholm, Sweden
Joined Dec 2005
76 Posts
It's working

Hi all.

The first four attempts resulted in crashes the gyro was rolling to the left
but after moving the mast back about 30mm and moving the motor to the center of the mast I was able to do two flights yesterday.
I also changed the prop from a 9x6 to a 10x6 and that seems to do the difference needed.
The motor now draws a bit too much power so I will try with a 10x5 or 10x4 later.
The motor is a bit weak though and it not even close to the performance of my Micromum.
But there is a big difference in weight the Micromum is 300grams and the
Maximum 1275grams, It will however handle stronger winds better.
I attach a picture of my son Olle and the gyro and a link to a short clip
taken by him with my telephone.
Video


/Magnus
Mango is offline Find More Posts by Mango
Reply With Quote
Old Jun 13, 2008, 04:18 AM
Registered User
PeterO_UK's Avatar
Joined Aug 2006
1,462 Posts
Jochen's advice to be when I was planning my BE-Shape was that the motor thrust line should be just above the CofG to give a bit of down thrust. Did you have to move your motor up or down ? Mine was a little bit too high on the mast to start with which caused it to pitch up and down as it flew along.

The link to the video doesn't seem to work

PeterO_UK
PeterO_UK is offline Find More Posts by PeterO_UK
Reply With Quote
Old Jun 13, 2008, 04:57 AM
Registered User
Mango's Avatar
Stockholm, Sweden
Joined Dec 2005
76 Posts
Motor adj

Hi Peter

I did'nt move the motor up or down but sideways
at first I offset the motor as I have on my Micromum
having read & watched Jochens thead Offset
But I guess I did offset it a bit too much so now it is at center of the mast but
the gyro still wants to go to the left but I can trim this so it's ok.
I'm thinking of making a new hub to make it a threeblader looking more like the original and also loose the weight of 1blade.
Strange about the videolink it works for me both with IE and Firefox.
here's the address:http://media.putfile.com/Maximum-80

/Magnus
Mango is offline Find More Posts by Mango
Reply With Quote
Old Jun 13, 2008, 06:12 AM
Registered User
South Korea
Joined Sep 2003
113 Posts
Mangus,

Thanks for sharing your video.
I needed to tilt my head 90 degree counterclockwise but still enjoyable.^^
What size of rotor blades and servos did you use?

Junhee
tnt2000 is offline Find More Posts by tnt2000
Reply With Quote
Old Jun 13, 2008, 07:02 AM
Registered User
Mango's Avatar
Stockholm, Sweden
Joined Dec 2005
76 Posts
Rotorblades

Hi Junhee

The rotorblade are 685x50mm and was made here in Sweden in the 80s
by a company that does'nt exist anymore.
They where made for another gyro called the HA-8
So if any of them breaks I will be in trouble finding new ones
The servors I am using are these:Servos
and I also use this BEC
to supply power to them.
The motor I am using is this:Motor
and this battery:Lipo

/Magnus
Mango is offline Find More Posts by Mango
Reply With Quote
Old Jun 13, 2008, 07:22 AM
Registered User
PeterO_UK's Avatar
Joined Aug 2006
1,462 Posts
Quote:
Originally Posted by Mango
Hi Peter
I did'nt move the motor up or down but sideways
Ah, Ok. I looked at the position of the motor relative to the pilots head in the two pictures you have posted and it looks like the motor has been moved down, but maybe the pilot's position has changed ?
Quote:
at first I offset the motor as I have on my Micromum having read & watched Jochens thead Offset
But I guess I did offset it a bit too much so now it is at center of the mast but
the gyro still wants to go to the left but I can trim this so it's ok.
Which side was the motor mounted on before ? I think it is better to try and get the motor position correct rather than using trim because the required trim will change with throttle and airspeed.
Quote:
I'm thinking of making a new hub to make it a threeblader looking more like the original and also loose the weight of 1blade.
Strange about the videolink it works for me both with IE and Firefox.
here's the address:http://media.putfile.com/Maximum-80
/Magnus
I get a box saying the requested video isn't avaiable at the moment. I could be a firewall problem so I'll try again from home this evening.
PeterO_UK
PeterO_UK is offline Find More Posts by PeterO_UK
Reply With Quote
Old Jun 13, 2008, 09:21 AM
Registered User
South Korea
Joined Sep 2003
113 Posts
Hi Mangus,

Thanks for equipments information.
that site is one of my favorite site..
Servos seems strong enough..
I hope I can make one of those in small scale soon..

Thanks,
Junhee.
tnt2000 is offline Find More Posts by tnt2000
Reply With Quote
Old Jun 14, 2008, 12:44 AM
Registered User
imsofaman's Avatar
Nowhere
Joined Aug 2003
6,178 Posts
Magnus....once again....great job. I am NEVER disapointed when looking at your cool copters.

Keep up the fantastic work....


Dave
imsofaman is offline Find More Posts by imsofaman
Reply With Quote
Old Jun 28, 2008, 04:06 AM
Registered User
Mango's Avatar
Stockholm, Sweden
Joined Dec 2005
76 Posts
Maximum #2

Hi

Here's a video & some pictures of my new gyro Maximum 2.0
The first version had an airframe made out of aluminium and had a 3mm swingshaft that was too weak, this one broke due to a sudden windgust
I have now replaced it with a 5mm swingshaft from a monstertruck.
Anyway I decided to build a new airframe made out of balsa & carbonfibre
I also replaced the tail with 3mm depron instead of 6mm
and made a new 3 blade hub.
I made the hub out of a cutting board I found in the kitchen.
All this to make the gyro lighter, it now weighs about 1100grams.
I also made the mast and the bottom of the airframe about 30mm longer
and moved the stab down 20mm because the rotor was hitting it.
Yesterday we were out and filmed it and I decided to try a 'rog'
and it worked out very well have a look at the Video
Thanks again Jochen for your lovley design.

/Magnus
Mango is offline Find More Posts by Mango
Last edited by Mango; Jun 29, 2008 at 03:53 AM.
Reply With Quote
Old Jun 28, 2008, 04:48 AM
Registered User
PeterO_UK's Avatar
Joined Aug 2006
1,462 Posts
WOW ! That's something to be proud of ! Congratulations.
PeterO_UK
PeterO_UK is offline Find More Posts by PeterO_UK
Reply With Quote
Old Jun 28, 2008, 06:43 PM
Registered User
JochenK's Avatar
Joined Jan 2005
1,286 Posts
Magnus,

just great! Though, by now, this is more your design than mine.

Please tell me what you used for the red and yellow bands on the tail and what exactly went wrong with the 3 mm swingshaft.

Jochen
JochenK is offline Find More Posts by JochenK
Reply With Quote
Old Jun 28, 2008, 07:00 PM
Registered User
imsofaman's Avatar
Nowhere
Joined Aug 2003
6,178 Posts
Hey....you both do awesome work!!!

Never sell yourself short Jochen....


Dave
imsofaman is offline Find More Posts by imsofaman
Reply With Quote
Old Jun 29, 2008, 03:48 AM
Registered User
Mango's Avatar
Stockholm, Sweden
Joined Dec 2005
76 Posts
Thanks

Thanks Peter, Jochen & Dave.

I am very happy that it works so well but this would never be possible without the help from people at this forum.
Jochen the tape used is solarfilm and underneath it is 3x0.5mm carbonfibre to stiffen the depron, you have to be careful when ironing the film though not to have too much heat because the depron will twist (& shout)
I have also used this to cover the blades using different colors for the upper and bottom side makes it easier to see the position.
The 3mm swingshaft was too weak the wind just pulled it apart.
I also got help from Lars Dücker a Swedish guy who designed several autogiros and also invented & patented the rotorhub back in the 80's.
The rubberbands closest to the center allows the blades to move slightly back and forth and is also a safety if the blades hit something (but this never happens )
As you might noticed the blades have no angle of attack this makes it steadier in flight (at least that's how it feels) but would also produce less drag.

Thanks again for your support.

/Magnus
Mango is offline Find More Posts by Mango
Last edited by Mango; Jun 29, 2008 at 04:11 AM.
Reply With Quote
Reply


Thread Tools