Berkut canopy hinge (Cad Drawing)

[tonyslongez]

Here

 

Berkut canopy hinge drawing was provided by --D--. I could not verify what version this hinge is from the drawing, by that I mean. It "LOOKS" different than the one my buddy John A. has on his Berkut. that is not to say that this hinge isn't a berkut hinge, only that John's hinges, I thought, where slightly easier to build. John and Dave R. are very close. John mentioned to me that "Dave R. had given him a new hinge that he had been working on" or something like that. If I remember correctly:scared: the geometry of the hinge is the same it just seemed a little more square than radiused. I'll try to get the hinge from John this week and see what the difference is. I believe it had something to do with allowing the canopy to open up more. email me for the Cad file. I still have to install my Adobe creator as I'm recovering my computer from a failed hard drive.

 

Tony

[tonyslongez]

I talked to John about his canopy hinges. I explained that the hinge that I drew was more rounded than his. John tells me that the hinge that I drew was the more recent hinge for the Berkut canopy. With that, this hinge can be built for use with the Berkut style canopy. John tells me that this hinge is a cast piece. I'm going to draw a hinge that I think may be used for the berkut style canopys, that'll be a bit easier to make.What I think is important here is the geometry of the hinge. I might be able to make this hinge out of 2 or 3 pieces that will be easy to machine.

 

Tony

[tonyslongez]

This may work as a two part hinge should be very easy to build as well. May have to be modified a bit but I think it's close.

 

Tony

[mak790]

"two part hinge" great idea

I did a little bit changes.

 

Short assembly video on youtube

[tonyslongez]

YES YES YES YES !!!!!!!!

 

That's it. great job Mac. that, we can make easily. Love it.

 

Tony

[mak790]

Thanks Tony

I decided to compare the weight of these hinges, solid version should weight about 2,030lb, solid version with hole 1,789 lb and my version 1,309 lb. But because I was using this option in Inventor for the first time so I'm not 100% sure.

I did it for 6061 alloy, I don't have 6061 casting option in Inventor so I believe solid casting should be slightly lighter.

[TMann]

I did it for 6061 alloy, I don't have 6061 casting option in Inventor so I believe solid casting should be slightly lighter.

Foundries cast in alloy 356 (which is indicated on the Berkut drawings.)

 

I can't find any info on that alloy but I'm betting the 6061 is a lot stronger.

I just picked up my chunk of 6061 for my next attempt.

Can't start on it until tomorrow at the earliest.

[mak790]

Foundries cast in alloy 356 (which is indicated on the Berkut drawings.).

I've never heard about that alloy as well. I know only one thing about 6061 it's fu... strong thats it (I did stress test for solid billet hinge in 6061 it's almost impossible to bend it). In europe we have different markings for example AlSi6Cu4 (AK64) or AlSi10Mg (Din 239A) all of them are common in foundries.

Btw I have only one alloy available in Inventor (6061).

[tonyslongez]

I don't have 6061 casting option in Inventor so I believe solid casting should be slightly lighter.

Mac that seems plausible. If you have the DXF file I can put it in solid works and tell you exactly what they are going to weigh. The solid hinge may be lighter that's fine but it's hard to make. I will take the weight penalty for the two piece hinge that I can machine on my mill not to mention it looks cool.

BTW.. if you ever need to know about metals. I use these guys to set up my metals in Cosmo.

http://www.aerospacemetals.com/

 

Tony

[tonyslongez]

Mac

 

this may be a little easier to machine.

 

Tony

[argoldman]

Mac

 

this may be a little easier to machine.

 

Tony

 

These renderings look great. I do have a question about the concept.

 

Do you intend to use just one of these in the middle of the canopy???

 

If so, you might want to think again.

 

The canopy-- na-- the whole plane is flexible and it is a good idea to separate your hinges as much as possible and relegate them to the most outside position possible, on each side, to prevent flexion and rotation both with the canopy open and closed. Remember that in the closed position, the hinges act as the forward most hold downs.

 

Additionally, affixing it to the middle of f28 is going to require a huge amount of reenforcement of that very thin bulkhead. When attached as far outside of the bulkhead as possible, reenforcement is a snap since you can tie the reenforcement to the fuselage sides.

 

If you are going to use two of these, one on each side.....never mind:rolleyes:

[mak790]

Do you intend to use just one of these in the middle of the canopy???

No, we are going to use them at the of the canopies.

[mak790]

this may be a little easier to machine.

Nice Tony

But do you read my mind? I thought about this same yesterday but I was tired and went to bed, next I was busy in the morning and finally when I found time I see that you were faster than me:sad:

 

One question about solidworks.

Do you have full version with cosmos, motion and etc. if yes is that possible to make stress analysis of the entire hinge because in Inventor I'm only able to test one part at once.

Because I'm going to buy solidworks student edition soon 99$ for solidworks 2006/2007 and 199$ for solidworks with cosmos, motion and etc (real bargain).

btw I did that stress analysis for 100lb

 

Mak

[tonyslongez]

Do you intend to use just one of these in the middle of the canopy???

Argoldman

 

NO the idea here is to replace the existing hinge that Dave has on the Berkut, not because the hinge is inadequate. Because they don't make them anylonger and alot of people want the Berkut hinge to use on the long Ez. This hinge is easy to make.

 

Do you have full version with cosmos, motion and etc. if yes is that possible to make stress analysis of the entire hinge

Mak

 

Yes I have the full version of Solid works with cosmo. I have class today until 5:00pm PST

I'll do the analysis tonight when I get home. If it looks good I'll start machining them, send them out to be anodized and it will look just like the rendering.

 

Tony

[tonyslongez]

MaK

 

I finally got around to putting the hinge in cosmos however it didn't like the hinge as a whole piece. Unfortunately I got the same results you did on the last stress Jpeg you posted, my looked identical to yours. I think I know why it wouldn't let me do the entire hinge because it was imported from autocad. I draw much faster in Autocad than I do in solidworks. I will have to redraw the hinge in solidworks and assemble it in solid works then I can get cosmos to stress it. sorry for the delay. Are we still interested in this setup? I think I am! It looks cool and I think it will be easy to make.

 

Tony

[tonyslongez]

lets tap these.

 

Tony

[Marc Zeitlin]

I'll do the analysis tonight when I get home. If it looks good I'll start machining them, send them out to be anodized and it will look just like the rendering.

1) When you guys do your stress analysis, to what tolerance are you performing your mesh sensitivity analysis to?

 

2) What's your mesh size?

 

3) How are you applying boundary conditions and loads?

 

4) You do realize that anodizing can significantly reduce the fatigue life of aluminum?

[TMann]

Just a note:

In the original Berkut hinge there is a cutout in the piece that mounts to the turtleback/rollover structure. This allows for the installation of 2 AN4 bolts from the outside.

I'm under the impression that this is due to the limited clearances you have in that area. In your drawing you indicate a long bolt at bothe ends of the hinge but I don't think you have the clearance to install it.

[tonyslongez]

T-Mann

 

Yep that is true. I can redraw the hinge to refelct that with no problem.

 

Tony

[mak790]

I'm under the impression that this is due to the limited clearances you have in that area. In your drawing you indicate a long bolt at bothe ends of the hinge but I don't think you have the clearance to install it.

TMann

The problem is I don't have berkut plans so I dont know how these hinges are fitted. I not going to buy them till summer so I cant give you the answer right now. Because unfortunately I have much more important things to do at the moment (then building Long). Anyway I did a little bit improvments on them. I hope it will be helpful. (but like I said I dont have these plans at the moment so it's hard ).

[mak790]

1) When you guys do your stress analysis, to what tolerance are you performing your mesh sensitivity analysis to?

 

2) What's your mesh size?

 

3) How are you applying boundary conditions and loads?

 

4) You do realize that anodizing can significantly reduce the fatigue life of aluminum?

I wrote in another post that I will have stress analysis next month in my school (UNI) and I'm not 100% sure about them that first and second even worse my technical english at the moment doesn't exist but I will be more then happy to give you all answers let's say in the next 1-1,5 month.

Mak

[TMann]

Here's a picture of the notch I'm talking about.

[tonyslongez]

Mak

 

Get rid of that top piece you added, so it looks more like the drawing that

T-mann posted

 

Tony

[TMann]

See attachment:

Area B is fine.

Area A is where you will have a problem with a long bolt. Thats the area in the pic I posted.

 

I should have a finished hinge to post later in the week.

[tonyslongez]

T-mann

 

Has area B been modified at all from the original drawings? I only ask because I thought that my buddy John's hinge looked different than that. I'll check on Sunday during our Bar-B-Q.

 

Tony