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CanoMod . Futaba-RC . A Main Hobbies

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Blitz Helicopters Avro 90 > Got my new Avro over the weekend
 
 
ratititat
Heliman
Location: denver, co.

Stet,
Ok well I loosened the motor and did find there is very little play maybe a 1/64 that you can move the motor up and down were it mounts to the motor mount but were the mount hooks to the frame there is not any play at all so I did move the motor on the mount up as high as I could and re-installed. The belt still rides just about the thickness of the edge of an X-Acto blade from the top of the pulley. I also checked the timing pulley you can only move it backwards and forwards to set the gear mesh you can not tip it up or down any. I did not flip the belt just because it is looking like it is tracking good and does not creep up or down when turned in ether direction and the instructions does say it rides the top of the pulley. And also if you look at the photo I got from the link that Bond007 gave me http://www.real-kbase.co.uk/arvo.html there belt looks like its riding in the same spot. Can someone that has one flying let us know if this is normal or not or if they are getting any excessive belt wear.
Thanks Stet I really appreciate the feed back and will for sure keep a good eye on this when I test fly it and report back with my findings.




03-06-2008 02:12 AM
 
 
ratititat
Heliman
Location: denver, co.

one thing working on servo set up tonight I did find a miss print on page 51 in the instructions they call out for a 520mm rod for the servo to tail transfer bell crank they sent a 350mm I will only glue one end on them to make sure they fit right first they looks like they do.

03-06-2008 04:21 AM
 
 
Stet
Elite Veteran
Location: Long Beach CA

on the belt, drive the system by rotating the clutch bell in the driven direction. If the belt walks away from the upper lip, that's good. Note in the instructions, they talk about rocking the motor in the mount to adjust tension and belt issues. If you can get it lined up so the belt comes just off the upper lip, you are in good shape.

Really, the best way to check is to spool it up under power, at low speed and observe the belt. In a perfect world it will float in the middle. These systems are well proven and reliable, unless not lined up. Once lined up, they don't have problems, except in the case of the gasoline motors which would cause the mount to sag under the weight of the motor.

IF the belt runs off track, this is what you get, notice the frames cut by the steel wire in the belt.




Enjoy your new heli. Looks nice.

keepin' it real
03-06-2008 06:11 AM
 
 
ratititat
Heliman
Location: denver, co.

Look how nice the servos installed they are real nice I'm very impressed and the way the dampening works for servo vibration I think is second to none. The head looks sweet. going to work on set up tomorrow I should have my tail blades and paddles by then so Saturday is looking good for the test flight.

Still looking into the belt there is no rocking the motor every thing is very solid just the little play in the bolts that mount the motor if you look at the timing pulley the belt is not riding right at the bottom so if I flip the belt and it starts to ride down it would ride on the bottom of that lip. I have tried to realigned the timing pulley and motor pulley but there is just no give any place. I will have time tomorrow I will flip the belt just to see it all comes apart real easy and I don't have the pulleys loc-tight yet.

03-06-2008 11:03 AM
 
 
Bond007
Senior Heliman
Location: Leicestershire UK

ratititat

My belt is exactly the same as yours in the photo's and I have run nearly 3 gallons through mine without any belt wear or running train issues

Dave did tell me the belt would run high on one pulley and low another.

This is normal

HTH

Sean

Blitz Avro, Trex 500
03-06-2008 03:42 PM
 
 
ANDYC
Heliman
Location: BICESTER/OXON england

Drive Belt

Ditto my belt looks exactly the same 2 gallons in no problems, finish the set up and go enjoy
03-06-2008 06:52 PM
 
 
rsalazar
Key Veteran
Location: Florida, USA

ratititat

It is looking good
03-06-2008 07:22 PM
 
 
delhezi18
Senior Heliman
Location: jakarta,indonesia

ratitita.

what are the max collective pitch and the max cyclic pich?. what is the length of the flybar? how does the swasplate travel like when you input +- pitch? eg. like trex 600 or like avant head?
03-07-2008 03:38 AM
 
 
delhezi18
Senior Heliman
Location: jakarta,indonesia

what is the length of the mainshaft rotor head?
03-07-2008 04:16 AM
 
 
kirk
Veteran
Location: Thornton, Colorado

I got a chance today to look at ratitita heli and it looks really nice!! The online pics of these machines do not do them justice

I played a bit with the belt on his and it looks fine. The accuracy in which everything is machined really makes assembly of the transmission/belt/motor mount alignment a no brainer. His belt tracks just like it should and did not require adjustment.

We also played with the linkages a bit and got all of the servo, head, and tail linkages set. All of the tail pushrods are cut to the correct length from Blitz so if the long tail pushrod from the tail belcrank to the tail pitch slider belcrank seems too long its because the boom is up too far (As depicted in the manual the end of the boom should be even with the front of the forward boom support).

One other area that is worth noting is getting the Ball link end flush in the elevator/anti rotation arm. The fit of the link in the arm is so precise that if you try to tighten it down without having the link seated in the metal arm the link expands when the bolt is threaded thru the link and that little bit of expansion will not allow the link to seat correctly into the arm. On ratitita's machine this happened which caused the length of the elevator arm to be too long. It only took a few minutes to fix but it is something to note when you build. Seat the link first then screw the bolt into the link... Also note that if you do not get that link seated correctly you are relying on that link to act as an anti-rotation bracket with very little support. That link needs to be fully seated or it could fail... All the linkages are the correct length in the manual so if the swash does not sit flat with the arms at 90 degrees the link in the antirotation/elevator arm is not seated correctly…

Ratitita is correct, there is a misprint on page 51 of the manual (says rod length should be 520mm but it should be 350mm) but the rod is cut to the correct length so if you know that all the rods are the correct length it should not be a major issue. The team at Blitz is aware of this typo and will correct future manuals...

I also wanted to pass along that if there is an assembly issue with the helicopter chances are that something is not assembled correctly. Everything on the heli is machined to very high tolerances and rods are precut so it will all fit together with no cutting, shimming, or filing. If you are putting one together and have any problems you can easily contact Motion Unlimited USA (sales@motionunlimitedUSA.com) or Blitz helicopters (sales@blitz-helicopters.com) and you will quickly get any support that is needed.

Thanks!!
Kirk
03-07-2008 05:51 AM
 
 
The Old Guy
Senior Heliman
Location: UK Surrey

My belt is also the same, not a problem.
03-07-2008 06:28 AM
HOMEPAGE  
 
 
ratititat
Heliman
Location: denver, co.

I just want to thank Buzz from http://www.motionunlimitedusa.com/ he has always been right there with any questions I have had on the heli and did a real nice job on the canopy for me. And Kirk ( MAN ) without ever having an Avro in your hands before you were right on with pointing out many things I over looked. That’s what I love about this hobby getting to know new people with the same interests it’s nice to have someone with lot of experience look over your model.
Thanks for all your help.
03-07-2008 06:46 AM
 
 
delhezi18
Senior Heliman
Location: jakarta,indonesia

kirk,

Can this heli do hard 3d besides f3c?
03-07-2008 04:00 PM
 
 
Real Raptors
Senior Heliman
Location: UK

Quote 
IF the belt runs off track, this is what you get, notice the frames cut by the steel wire in the belt.




We have had a couple of emails regarding the above statement posted by Stet, just to let you know this image is not a Blitz Avro, but it looks like a Robbe heli.

Installation of the drive belt into the Avro has been designed for simplicity and ease of engine removal. The running position/height between the pulleys and tension of the drive belt is pre-set by design and only a small amount of angular adjustment is provided to alleviate the natural bias of the drive belt. This system does not allow the drive belt to be over adjusted to the point that damage could occur to any aspect of the drive line. Again just to reassure you guys this has never happened to any Avro over the many hours of testing that Blitz Helicopters did, we have about 4 gallons of fuel through our Avro and again it shows no sign of wear, hope this puts your minds at rest.

Andy
03-07-2008 11:42 PM
 
 
kirk
Veteran
Location: Thornton, Colorado

delhezi18

I am not the best person to ask as I have yet to fly one but with the experience I have with the machined parts and the design of the heli I am confident that this machine will hold up just fine…

As I am sure you know most if not all modern day helis are capable of hard 3D in the right hands, and this one is no exception (There are some videos running around of some pilots throwing the machine around pretty good).

I do know that the team at Blitz did not set out to design an all out 3D only heli. Is what they set out to do was offer a world class heli that was high quality, had great support, joy to build, and was adjustable for different flight disciplines. If you have not seen one in person its hard to understand the attention to detail that has gone into making this machine something special…
03-08-2008 06:11 AM
 
 
e-copter
Senior Heliman
Location: Nice, France

HI,

for the belt height adjustment, it is possible simply to use some metal shims between the internal cage of the motor output bearing and the copper insert on which the cluch / can assembly seats.
Just make sure to use thin but strong shims that will not rip on the bearing flanges
Then, if your belt is abnormaly touching the upper side of the main motor pulley, just double check the transmission alignment and especially the back pulley and the way it's support is fitted on it, sometimes it's just a small fitting issue

Everything else fits perfectly and this heli is just a great pleasure to build and fly


Best regards,

Fabien
03-09-2008 01:23 AM
 
 
ratititat
Heliman
Location: denver, co.

Well on my way to the field see what she will do. The lines on the canopy make it solid no flex.

03-09-2008 09:15 AM
 
 
ratititat
Heliman
Location: denver, co.

We did the test fight today I will let Kirk do the post fight report I need to get on a plane to San Diego for work he should have some killer video also it did good in the mile high at 5,800 above sea level talk to you all Tuesday when I get back.

03-09-2008 11:38 PM
 
 
rsalazar
Key Veteran
Location: Florida, USA

ratititat


It is a very nice heli!!

I really like the canopy, I can see it

Thanks for sharing this photos
03-10-2008 04:40 AM
 
 
kirk
Veteran
Location: Thornton, Colorado

I did not get a chance to fly ratititat's heli but I did see it fly and it looked good. He put 4 flights on it and the belt did not show any signs of rubbing or wear. The heli appears to roll and flip really fast yet it is stable and easy to hover.

As soon as I can get the vids downloaded and edited I will post them...

Thanks!!
Kirk
03-10-2008 07:28 PM
 
 
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Blitz Helicopters Avro 90 > Got my new Avro over the weekend
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