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Composite ARF Mig29

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Old 11-08-2018, 06:49 AM
  #476  
hemi
 
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Craig
two migs has got to be better than one. I’d love it.
John
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Old 11-08-2018, 09:24 PM
  #477  
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OK guys I just got my CG to be 25 mm forward of the front main spar but now I have another issue my nose gear is collapsing completely practically my nose of the airplane is touching the ground how can I get the nose Strut to be more stiff. Levi can you please check the picture and tell me if my CG is good
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Old 11-08-2018, 09:30 PM
  #478  
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I had to install all my batteries in the nose cone so I can get this CG,by the way my Mig is weighing in to 25 kg/55 pounds dry does that sound OK.
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Old 11-09-2018, 02:26 AM
  #479  
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Nick your cg is ok. Mine is 5 mil further back but yours should be ok for maiden. I had the same issue with my nose leg. If you try to fly it like that TO will be ok as the weight is at the rear but it will collapse on landing. With the Mig 29 there is a massive amount of weight on the nose leg as itís very far back. Is your strut compressing or is the leg actually retracting on its own?
i pulled my strut apart and added some tygon inside the spring to stiffen it up. If the leg itself is starting to fold back Iím guessing you must only have one ram on the nose gear. Mine would not work with just the one ram. I needed the upper and lower rams to have enough holding and retraction power, as did Graig.
Dont fly it if itís borderline mate.

PS You weight is on the heavy side of ok. Mine is 24.5kg dry with all the options.
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Old 11-09-2018, 04:26 AM
  #480  
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Levi thanks for the response, both things are happening as you mentioned what do you mean by the upper and lower ram can you let me know thank you Nick.
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Old 11-09-2018, 05:16 AM
  #481  
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Nick
You’ve done some fine work so take your time and get it right. The weather probably won’t cooperate anyway.
John
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Old 11-09-2018, 05:58 AM
  #482  
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Thank you John I just saw what you meant there is snow on the ground as Iím taking my kids to school .
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Old 11-09-2018, 05:59 AM
  #483  
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Chicago weather !
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Old 11-09-2018, 06:08 AM
  #484  
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We are getting it today as well. Have a great weekend
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Old 11-09-2018, 06:10 AM
  #485  
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You too John
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Old 11-09-2018, 06:46 AM
  #486  
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Originally Posted by spaceman 01 View Post
Levi thanks for the response, both things are happening as you mentioned what do you mean by the upper and lower ram can you let me know thank you Nick.
Hi Nick,

the later version of the nose gear had a modified upper frame that allowed for connection of a separate hydraulic ram that ran along the floor of the fuse under the cockpit area. If you look carefully at my fit out picture you may see it. Levi and I are using both rams on our nose legs. That is why our nose legs move with authority (check out my vid above). The upper ram has better geometry for fully retracting the nose gear; the original scale ram that attaches to the front of the nose leg has better power for holding the nose leg in the down position.

I inserted a delrin spacer inside my nose leg to compress the spring inside the strut. This made it feel stiffer and also limited the compression that could take place by providing a hard stop that limited the compression. Levi stiffened his nose leg up by putting tygon fuel tubing inside his spring.

Hope that helps.

Last edited by Craig B.; 11-09-2018 at 07:20 AM.
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Old 11-09-2018, 07:01 AM
  #487  
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Thank you Craig are you referring to two different cylinders I have the big one the main one which is a lucking type in there,I cannot see where you have install the second one in your picture .
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Old 11-09-2018, 07:13 AM
  #488  
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Originally Posted by spaceman 01 View Post
Thank you Craig are you referring to two different cylinders I have the big one the main one which is a lucking type in there,I cannot see where you have install the second one in your picture .
Hi Nick,

the cylinder is housed within the wooden box in the centre of the picture....do you have that cylinder?
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Old 11-09-2018, 07:19 AM
  #489  
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Nick,

see attached pic.....

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Old 11-09-2018, 07:19 AM
  #490  
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Yes Craig,thatís the one that I have and from my understanding when it travels to the down position it locks but still I have lots of play with in the whole system. Thank you Nick
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Old 11-09-2018, 07:24 AM
  #491  
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Originally Posted by spaceman 01 View Post
Yes Craig,thatís the one that I have and from my understanding when it travels to the down position it locks but still I have lots of play with in the whole system. Thank you Nick
Yeah ok, that ram does not lock the nose gear in the down position very well. It is good on the retraction end but not so great on the down lock end. We are also using the scale cylinder that runs down to the front of the nose leg that you can see in my youtube vid posted above....that one really helps lock the nose leg in the down position well....better geometry than the top ram. Are you using that ram?
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Old 11-09-2018, 07:30 AM
  #492  
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Mine is set up with a static type one just for looks. Where can I get a cylinder that travelers that long ?
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Old 11-09-2018, 07:31 AM
  #493  
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Tonight I will post how mine looks.
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Old 11-09-2018, 07:37 AM
  #494  
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Originally Posted by spaceman 01 View Post
Mine is set up with a static type one just for looks. Where can I get a cylinder that travelers that long ?
I thought that might be the case. I would take some measurements and speak to Peter Hausl...he used to be able to make locking cylinders of custom length. Tell him what it is for. Gotta have that nose leg reliable...don't want to dig that nose into the dirt on landing!

Let us know how you get on.
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Old 11-09-2018, 07:41 AM
  #495  
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Craig is this the same Peter that makes that hydraulic system for it. thank you Nick
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Old 11-09-2018, 07:53 AM
  #496  
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Yes Nick
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Old 11-09-2018, 08:30 AM
  #497  
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thank you, Craig
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Old 11-09-2018, 04:37 PM
  #498  
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Here is my setup for the nose gear, I just saw where the problem is I need to incorporate one more cylinder or something to hold the strut from backing up under force.
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Old 11-09-2018, 05:01 PM
  #499  
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Also I needed to put all the batteries and most of the controls right in the cone of the Mig

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Old 11-10-2018, 02:59 AM
  #500  
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Nick Craig covered it. That bottom 45 deg ram needs to be active. It’s the only thing stopping you from eating dirt
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