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Bob Cat Copy Falcon 120 Jet

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Old 08-05-2008, 06:28 AM
  #1476  
tim777jet
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Default RE: Bob Cat Copy Falcon 120 Jet

Well i made up an adjustable length nose gear mechanism. The idea was to lengthen the nose leg to increase wing angle of attack for an easier take off and reduce it again for landing to hold the nose down on the rough grass. Tried it out yesterday and worked well, take off was lighter on the elevator and on landing the nose stuck to the ground. It operates from a double acting pheumatic cylinder and when pressurized up, the mechanism goes over center to take all load off it, and when down ithe mechanism stops on itself again taking the load off.
I did find that the last time i flew, my hydrulic damper i made and fitted inside the leg, had in fact leaked, which was why there was a nose gear bounce in my last video. I repaired the unit and changed the oil to a lighter oil and it performed brilliantly yesterday. I think this helped a great deal as well.
With the leg in shortened mode, the mechanism still allows full use of the suspension. I did find that due to the geometry, the front of the apex links almost touch the ground when the suspension is fully bottomed out, so i restricted its movement for the test flight slightly to prevent it digging in. Will need a slight rethink
Wind was full on 90 degrees and really rough, a credit to plane yet again.
Nose gear light was great in the not so bright sky, but smoke system was not impressive, i think due to the strong winds disipating it really quickly.

www.youtube.com/watch?v=dtVwtlhCXrE

Internet just crashed so lost the upload to youtube to see the landing, will post later, cheers Tim

here you go www.youtube.com/v/Na5KCel94yg

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Old 08-05-2008, 09:57 AM
  #1477  
BillS
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Default RE: Bob Cat Copy Falcon 120 Jet

I have the smaller Bob Cat with fixed gear at a location I like and it takes 12 oz. of weight on the stabilizer to rotate. I measured a friend’s 120 and it takes over 50 oz. on the stabilizer to rotate. 50 oz. seems like too much and I think the mains should be closer to the CG.

Bill
Old 08-05-2008, 12:50 PM
  #1478  
B58
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Default RE: Bob Cat Copy Falcon 120 Jet

On the nose gear length, this may not be relavent, but the B-58 used an oleo nose strut of course. It also had a lever that hit a stop on retraction and bled the strut pressure off to 150 psi, down from about 500 if I remember right. It made for landing on a soft strut instead of a solid one when the weight was much lower. Wonder if someone will come up with a simple deal like that for models? Bob
Old 08-05-2008, 03:57 PM
  #1479  
new2jets
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Default RE: Bob Cat Copy Falcon 120 Jet

just a few photos
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Old 08-07-2008, 12:23 AM
  #1480  
scalejet
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Default RE: Bob Cat Copy Falcon 120 Jet

Hello jet fellow i have been follow this thread for a while until i have finish building the falcon -120 with the brand new jetcat p-70 and all the elec gear and retract were new .i am now thinking of selling it ,due to no time and the flying field is too far for me to go for regular test flight and everyday flying ,so i am looking to sell it .the jet was nicely build and reinforce and everything is ready to test flight need nonthing at all.
Old 08-07-2008, 08:50 AM
  #1481  
mardio
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Default RE: Bob Cat Copy Falcon 120 Jet

Hi

As i am new to this plane got mine today i was looking for retracts and found these http://www.hobbycity.com/hobbycity/s...idProduct=5324
Any good

mardio
Old 08-07-2008, 03:25 PM
  #1482  
sweetpea01
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Default RE: Bob Cat Copy Falcon 120 Jet

recheck your link. You may have to put spaces between the letters as it appears RCU is banning that word
Old 08-07-2008, 10:57 PM
  #1483  
454
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Default RE: Bob Cat Copy Falcon 120 Jet

I would put money on the fact that a wren t wheel would work

check out altecarerc.com
that cs retract are the shisnit they have a full set up for the falcon
Old 08-08-2008, 12:40 AM
  #1484  
topgun600
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Default RE: Bob Cat Copy Falcon 120 Jet

couple of questions I was wondering if you all might help ??

first, I found kerosene fairly cheap to buy at Oil dist, but they offer regular kerosene and odorless its a few cents more has anyone used it???

second, Im building the nitromodels Falcon 120 and the main gear legs are 8 in long and the nose is 6 in. Robart Robo strutts are barely 6.8in, what struts are you recomending for the mains??or can you modify the wing and use the shorter Robart struts and make all three 6 in long??

third, Im useing a JJ1400 turbine the mounts supply'd in the kit are hardwood blocks, are wood sqreews to fasten the engine ok or bolts through the block and fuse? andif your not gonna use the wood, who's mount works best?

and last Im told that brakes are needed so which brakes do you all recomend?

Thanks Guys TOPGUN
Old 08-08-2008, 08:22 AM
  #1485  
mardio
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Default RE: Bob Cat Copy Falcon 120 Jet

http://www.hobbycity.com/hobbycity/s...idProduct=5324

Should be (hobby city .com) were the 4 * are no spacers but
Old 08-08-2008, 03:02 PM
  #1486  
Jetpilot24
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Default RE: Bob Cat Copy Falcon 120 Jet

Here is a shot of my Falcon at Liberty Bell Jet Rally this past weekend.

Power is a Wren MW54 MK4.

Joe L.
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Old 08-08-2008, 06:30 PM
  #1487  
sweetpea01
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Default RE: Bob Cat Copy Falcon 120 Jet

nice corn in the background
Old 08-09-2008, 12:14 AM
  #1488  
erazz
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Default RE: Bob Cat Copy Falcon 120 Jet

And her's some of mine from this Friday


Sorry, no video yet []
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Old 08-09-2008, 12:31 AM
  #1489  
sweetpea01
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Default RE: Bob Cat Copy Falcon 120 Jet

That is just too cool.

You should sell the float system as a kit or sell the plans for it!
Old 08-09-2008, 01:22 AM
  #1490  
rcjets_63
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Default RE: Bob Cat Copy Falcon 120 Jet


ORIGINAL: erazz

And her's some of mine from this Friday


Sorry, no video yet []
That's great; I can't wait for the video. What was your inspiration.....

[link=http://www.youtube.com/watch?v=W1iJV4qgW9s]http://www.youtube.com/watch?v=W1iJV4qgW9s[/link]

Jim
Old 08-09-2008, 02:56 AM
  #1491  
Woketman
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Default RE: Bob Cat Copy Falcon 120 Jet

Who da man? Erazz da MAN!!!!
Old 08-09-2008, 09:23 AM
  #1492  
Nickosfly
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Default RE: Bob Cat Copy Falcon 120 Jet

COOL

Very COOL


Old 08-09-2008, 10:10 AM
  #1493  
erazz
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Default RE: Bob Cat Copy Falcon 120 Jet

Hi Guys and thanks for the compliments...

I'd like to thank Ravivos for the excellent pictures.

There was no inspiration other than the severe lack of runway at my local field. I must admit that being able to cool-off between flights is a very big plus. 35 degrees C + 90% humidity is hot! But returning the plane is both fun and a good exercise

When I started the conversion I thought about leaving an option for the landing gear. I've since removed and taped over all the bays. This one is a keeper as a float plane.
Sorry but I'm not the kit producing person. I'd be happy to share the design and lessons learned with anyone who wishes to.
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Old 08-09-2008, 12:49 PM
  #1494  
erazz
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Default RE: Bob Cat Copy Falcon 120 Jet

Did I say no vid??

I meant no vid yet!

[link=http://www.youtube.com/watch?v=YAS6q9dwHxE]http://www.youtube.com/watch?v=YAS6q9dwHxE[/link]
(yes I know it's not good quality but in the absence of a pro cameraman I'll take what I can get)
Old 08-09-2008, 12:58 PM
  #1495  
Nickosfly
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Default RE: Bob Cat Copy Falcon 120 Jet

YEAH....it is COOL...Absolute....
You can fly in your swimsuite

Nickos
Old 08-09-2008, 03:21 PM
  #1496  
Speny
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Default RE: Bob Cat Copy Falcon 120 Jet

ORIGINAL: erazz

Hi Guys and thanks for the compliments...

I'd like to thank Ravivos for the excellent pictures.

There was no inspiration other than the severe lack of runway at my local field. I must admit that being able to cool-off between flights is a very big plus. 35 degrees C + 90% humidity is hot! But returning the plane is both fun and a good exercise

When I started the conversion I thought about leaving an option for the landing gear. I've since removed and taped over all the bays. This one is a keeper as a float plane.
Sorry but I'm not the kit producing person. I'd be happy to share the design and lessons learned with anyone who wishes to.
I like your bath toys!!!

Im only allowed to have a rubber ducky in my bath. LOL

Spen

Old 08-09-2008, 03:57 PM
  #1497  
Strykaas
 
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Default RE: Bob Cat Copy Falcon 120 Jet

One of the coolest jet thing for a long time on RCU.
Old 08-09-2008, 07:59 PM
  #1498  
mongo
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Default RE: Bob Cat Copy Falcon 120 Jet

could have much prettier bath mates, if ya ask me.
Old 08-10-2008, 01:01 AM
  #1499  
Ravivos
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Default RE: Bob Cat Copy Falcon 120 Jet

No doubt Erez did an exellent work on his water falcon, it was absolutely exilirating to see this falcon take off over the "kineret" lake.
erez, thank you for your compliments but the credit is all yours...

Raviv.
Old 08-11-2008, 07:18 PM
  #1500  
hooker53
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Default RE: Bob Cat Copy Falcon 120 Jet

erazz, thats just off the hinges. NOWI'v seen it all and here I am still working on my first jet!!!! Ha. Hooker53


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