Posts: 571
Joined: 2/18/2003 From: London,
ON, CANADA Status: offline
quote:
ORIGINAL: Kmot
I was going to ask what the top cylinder does. Then Strykass claimed it helps lock the gear. I still don't understand. How does the top cylinder lock the gear? I can't see any movement in the CAD video.
The CL-215 landing gear is a head scratcher for sure.
I think Giacomo's cad video is excellent. I think the confusion is coming from the fact the top cylinder is his video is placed too far up on the pivot and should placed lower to actually pull the top leg in to lock it in place.
Posts: 571
Joined: 2/18/2003 From: London,
ON, CANADA Status: offline
Martin Closterman has made up for plans of a CL-415 160"ws for me. The plans came out to 90' of rolled paper. I have a couple other projects to finish first before i get started on my CL-415. I would like to use a couple of these for powerplants if i come into some extra money. By the way how much $$$$ can you get for a kidney...........
Posts: 571
Joined: 2/18/2003 From: London,
ON, CANADA Status: offline
quote:
ORIGINAL: Closterman
Hello Grinder, when you will start on you CL-415, don't search for your laser cut parts, I have buy my own laser and I wil be able to cut your kit !!
I work now to cut a 160" WS kit for a guys in Québec. I will put G-45 engine on his 415 !! But, if you put turbine, your the winner !!!
Yes i saw on your web site you do your laser cutting now. Cool. I for sure will use you for cutting my kit. Your are a good guy to deal with. Yes G-45's sound about right for CL-415. If i ever come into some money turbines will be the way to go but for now G-45's will have to do. Maybe later this year i will have you cut my kit for me. Giacomo's build is interesting to me, I'm following along with great interest.
Grinder.
< Message edited by grinder-RCU -- 1/18/2007 7:40:22 AM >
In the days preceding the surgery I got the time to build the fuse mock-up where I'll test the main gear installation and operation.
Basically it is the same MAIN GEAR BOX (MGB) I built for the fuse but with upgraded plywood (birch instead of lite poplar) an a different C31 bulkhead (the -mask-). It allows me to:
- easily install all the pieces (installation in the fuse is possible but is a PIA and requires time and patience);
- inspect them as they move (some of them will be hidden in the finished fuse) for -diagnostical- purposes.
I didn't glue the forward -mask- in place: I used a large number of screws to allow its removal.
I think Giacomo's cadvideo is excellent. I think the confusion is coming from the fact the top cylinder is his video is placed too far up on the pivot and should placed lower to actually pull the top leg in to lock it in place.
Thank you grinder. 1st things 1st though: CAD aknowlegement goes to Bernard who did it first and provided the info and drawings I used to model mine in SW... I simply re-did his work to double-check everything and to get a better understanding of the whole cynematics. Re-designing helps understanding...
About Mr. Closterman design: it is almost the same but for the locking arm hinge position with respect to the actuator attachment point:
- Closterman's hinge is above actuator attachment point ==> actuator pushes to lock
- Bernard's hinge is below actuator a-p ==> actuator pulls to lock
Same result, two different ways... Bernard's setup requires a single actuator but Closterman's could employ one as well...
IMHO everything works fine, or put it in another way, everything represents a very good trade-off between opposing needs.
I did my homework with my left hand in these last few days... here it is what I came up with.
I was looking for air cylinders to operate the gear: I was looking @ the units made by Robart (3/8" bore), Skymaster, Ultra-Precision, Jet-1A, BVM and similars, when I came across 2 companies that make professional cyls of almost any size...
These are totally different animals than those listed above: 304 stainless steel body, 303 ss piston and rod, alu end-caps, bore sizes starting @ 5/16" , 7/16" , 1/2" and custom stroke lenghts, double or single effect, with or without failsafe springs... I think you got it!
It took me yesterday to browse through the many possible solutions and the CAD files provided by both the mfg.s surely helped me making up my mind: I actually integrated the selected cylinders into the model and tested if they worked as I expected.
LOWER Cylinders
Both Bimba and Clippard work fine: Bimba's are 7/16" bore while Clippard are 1/2", they share the same length and the same 1" stroke; identical, Bimba being polished on the outside.
UPPER Cylinder
Here 1/2" stroke is needed PLUS some extra rod length (around 0.36'') that is more easily tuned with Bimbas than with Clippards. Same bore as above, 7/16".
Attached pics show setup with Clippards (first 2 on the left) and Bimbas (right, darker cyls)... not many differences at all!
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RE: Bernard Dumas' Canadair CL-215 - 
