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Bob Cat Copy Falcon 120 Jet

Old 05-18-2010, 04:53 PM
  #3426
fireblade5437
 
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Default RE: Bob Cat Copy Falcon 120 Jet

Mike

When I looked into the box at Long Marston the fuz definitely looked the same as my 120 and I think you are right the canopy just needs cutting down.

Alan
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Old 05-18-2010, 04:57 PM
  #3427
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Default RE: Bob Cat Copy Falcon 120 Jet

I agree that's why I brought a clear canopy of NORAY (on RCU) very clear and much stronger well worth the $15.00

Alan
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Old 05-18-2010, 05:18 PM
  #3428
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Default RE: Bob Cat Copy Falcon 120 Jet

$15 to the UK, who are you kidding I bought six of those and after post packaging and cost they worked out to £22.00 each, I would certainly like to know how you did it for $15.00.

Mike
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Old 05-19-2010, 04:53 PM
  #3429
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Default RE: Bob Cat Copy Falcon 120 Jet

Just got my orange/black Falcon and have to say it was packaged extremely well. I haven't gone through everything with a fine tooth comb yet, but did notice that the tube inside the wing appears to be folded paper. Can you say paper towel tube? I will be opening the bottom skins of the wings to see if the tubes make it through all the formers as discussed earlier.

The formers in the fuse appear to be glued in fairly well from first glance. I'm thinking that they will be fine for EDF. All other reinforcements will be Hysol.
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Old 05-21-2010, 02:56 PM
  #3430
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Default RE: Bob Cat Copy Falcon 120 Jet

Just a quick update of my build. I'd day my struts are 90-95% done with the exception of the main strut upper mount area (overall length) which I will determine when I start installing the gear.

Here are some pics of the finished struts. I made my own grooved pins for use with E clips and as an experiment I bought these "jet wheels" from hobby king which worked out to be great wheels/tires. I have some BVM wheels/tires and these are at least equal in quality. They are a bit heavy but nothing more than a few grams compared to BVM wheels of the same size, probably due to the dish style wheel with no cavities milled out. The rubber feels like top quality hard rubber like everyone elses and I believe they were about 7 bucks a piece which is amazing.

I will machine my own brakes for the main wheels. I am still deciding on whether to go with the o-ring pushing to the side like a disk setup or with the o-ring expanding out like BVM brakes. the latter will require that I make a shallow drum and bolt it to the inside of the rim (I left space for a brake) the o-ring pushing to the side does not require a drum but I am worried about how exactly it will retract once it brakes and if it will cause un-needed drag.

Any opinions?

I also worked a bit on the formers...pretty soon...

Best regards,

Chris
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Old 05-21-2010, 03:02 PM
  #3431
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Default RE: Bob Cat Copy Falcon 120 Jet

Plus postage sorry should have said that
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Old 05-21-2010, 06:12 PM
  #3432
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Default RE: Bob Cat Copy Falcon 120 Jet

Having used both types of brake expanding O ring from a couple of pistons and the expanding bladder inside a housing to bear on the hub like a disc brake, I can vouch for the disc brake set up, the O ring type are either on or off the disc type are proportional and far better in my estemation.

Intairco wheels and brakes are very heavy and not very effective, the Digitech/Behotec wheels and disc brakes are much lighter and work very well.

Mike
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Old 05-23-2010, 01:06 PM
  #3433
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Default RE: Bob Cat Copy Falcon 120 Jet

Anyone know where i can get a set of engine mounts made up in the uk?

I had a look at using the originals with the 6mm spacer the height is perfect, however the thermocouple on the engine means id have to cut a chunk out, think id feel safer with some stand off posts with a flange on the end.
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Old 05-23-2010, 03:18 PM
  #3434
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Default RE: Bob Cat Copy Falcon 120 Jet

Hi Chris, when i made my brakes i used an o ring expanding and pushing outwards againt the wheels hub. I did get leakage around the O ring sometimes, so used a new stanley blade and carefully cut the O ring all the way round, from the inside diameter, approx 1/2 way through. The air pushes the o ring outwards and the cut lips, seal perfectly against the walls of their o ring cut outs, simple and very effective. I use just one air tank for U/C retraction, (spring down/air up) , nose gear extension mechanism (for take off) and also for braking, and have no probs at all with volume of air required for these operations.I have no experience of the disc brake style pnematic brakes. Mine are full on or full off, have the o rings lightly greased with vasaline and work very well, really pleased with them, cheers tim
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Old 05-23-2010, 03:35 PM
  #3435
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Default RE: Bob Cat Copy Falcon 120 Jet

Engine mount There is a template for one that you can bend yourself in on this forum post # 561 this page http://www.rcuniverse.com/forum/m_59...23/key_/tm.htm
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Old 05-26-2010, 06:04 PM
  #3436
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Default RE: Bob Cat Copy Falcon 120 Jet

Hi,
I just bought one of these Falcon 120 kits and found this thread.

But 138 pages to read!!!!!!!!
Anyone got an edited highlights version?
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Old 05-26-2010, 06:13 PM
  #3437
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Default RE: Bob Cat Copy Falcon 120 Jet

I hear ya. It's a LOT of reading. You'll probably have the thing built before you finish.

Try reading around post 3215 (page 129) for some ideas of where to make corrections to the frame, also page 126 & 136. Good luck!
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Old 05-26-2010, 09:50 PM
  #3438
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Default RE: Bob Cat Copy Falcon 120 Jet


Quote:
ORIGINAL: alasdair

Hi,
I just bought one of these Falcon 120 kits and found this thread.

But 138 pages to read!!!!!!!!
Anyone got an edited highlights version?
It goes MUCH faster than you think.
I got my model at page 120, and it took 3 evenings of skimming, with some occasional cut-and-paste to a WORD file.
IMHO, it is WELL worth your time to skim and copy. There is a tremendous amount of fantastic information ... much of it "hard-won".
Greg
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Old 05-26-2010, 10:02 PM
  #3439
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Default RE: Bob Cat Copy Falcon 120 Jet

I couldn't agree more with jetflyr. I selected important sections and printed it out. It's been a better guide than the instructions. (no lie there). It's a quick build.
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Old 05-27-2010, 07:41 AM
  #3440
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Default RE: Bob Cat Copy Falcon 120 Jet

Quote:
ORIGINAL: madfreestyler

RCPI,

Heres what i have done so far, im not saying this is the defacto standard but ive been through this forum more times than i can count and this is what ive done so far :-

Fuselage
-Formers modified to accept 50oz dubro tank sits above the wing tube (found it actually holds 1.8 litres and i had spare ones so a bonus)
-Going to stregnthen the formers and fill gaps with microballons and epoxy
-Engine mount raised 15mm and cut to allow 6 degrees of downthrust

Booms
-Stab underside plated with alu tape
-Servo bays modded to accept Hitec 225MG servos (inner ones had to be raised slightly as there isn't enough depth)
-Stregnthened the captive nut mountings with epoxy
-Made custom extension leads with mpx connectors
-Going to change to use cap hex bolts rather than the plastic ones in the kit.

Wings
-All formers around the u/c mount sandwiched with carbon cloth and epoxy
-Ran PVA with a hyperdermic down all seems as they look a little dry
-Changed flap hinges to the barbed type as the slots were to thick for the mylar ones supplied
-Again made custom extension leads with MPX connectors
-Im going to use hex bolts permannently in the wing with wing nuts for ease of rigging
-Hitec 5845's used on each aileron and flap

Control Rods
M3 high tensile stud sleeved with carbon and a 2mm ball link either side = 0 slop
Control horns are from pete tindall in the uk

Still hacking away at it, ive got too many projects on the go so just doing a bit at a time. Hope to get in ready in the next month or so ready for when the weather breaks.
Alasdair this is what i have done so far, slight ammendment to the above ive changed the turbine mount. In the end ive fabricated a mount out of square tube ally with 10mm posts. Will post some pictures when its done.

Also went with the digitech retract package with the trailing links and valves. Need to modify the fairings though to suit.

I had a few issues with the engine but it is now sorted so hopefully ill get the build finished in the next couple of weeks.
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Old 05-27-2010, 09:33 AM
  #3441
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Default RE: Bob Cat Copy Falcon 120 Jet

Also, you can use the spots where the elev servos would go and put the rudder servos there so they're less visible. Then place blocks in the horizontal stab center section to beef it up and put the servo on that instead of having 2 servos drive the elevator like the manual wants. That makes more sense and will look better. I'm making mine come out the top like some other guys just so it won't get in the way of the nacelle. Here's a pic of what I'm talking about. I used balsa to make the template. Then I'll cut out the shapes in hardwood and install.
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Old 05-27-2010, 12:50 PM
  #3442
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Default RE: Bob Cat Copy Falcon 120 Jet

So many questions, so much to read. JetCatJimmy is right, it might be quicker to build than read 138 pages.

I started a cut'n'paste into a Word file. Then I thought - this has been done before.
Anyone happen to keep their Word file and could email it to me?
I'm thinking Spektrum 7 radio and Wren 44 or 54 (both in stock) maybe fixed gear - or is there a drop-in set of good retracts? Don't you need to shorten the legs for a jet to get rid of the "tall stalky" look, and then will the legs retract into the wells?
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Old 05-27-2010, 01:07 PM
  #3443
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Default RE: Bob Cat Copy Falcon 120 Jet

You're right about shortening the legs. It will look very strange in its current setup without a prop swinging in the back. I'm not sure how much to shorten though.

As for the retracts, ProEDF has a killer deal right now. They take a couple weeks to get to you but you can't beat the price. Spring Air are another option.
Here's the ProEDF link: http://proedf.com/index.php?p=6&id=6...fb5c9c&lang=en

You'll need to fill in the original wheel cutouts but that's no biggie. Also stiffen up the wingspars if your gear clears them.

MAKE SURE you seal the retract bays. Many of the issues people have with failures on this jet are when air gets into the wing or fuse and stuff blows apart. Seal it up good for a turbine and lay glue anywhere in the ribs you can get to. I dripped wood glue around all the ribs I could see and tilted the wing so it would flow into every corner.
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Old 05-27-2010, 01:09 PM
  #3444
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Default RE: Bob Cat Copy Falcon 120 Jet

alasdair

If you are thinking 44 and fixed gear then that would be more suited to the smaller bobcat, this one is for the 54 and retracts really.

Yes thought about asking has anyone already done a cut and paste of all the useful bits, and could post it as a pdf / word file etc ?
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Old 05-27-2010, 02:16 PM
  #3445
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Default RE: Bob Cat Copy Falcon 120 Jet

On the retract front the digitechs need a mod to the wings as the wells on the mk2 are shorter than the mk1 plus you would need to widen them for the oleos. The nose well will also need modding as it is too shallow. Easy mods but takes a little time. Other than that would recommend them based on quality plus they come with the trailing links as well.
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Old 05-27-2010, 02:37 PM
  #3446
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Default RE: Bob Cat Copy Falcon 120 Jet

Yeah, I agree if you can get trailing link gear do it. It will take SO much stress off the mounting blocks.
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Old 06-01-2010, 07:11 AM
  #3447
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Default RE: Bob Cat Copy Falcon 120 Jet

Just maidened my Falcon 120.

http://www.youtube.com/watch?v=E58aixWYtnM

Enjoy,

jim
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Old 06-01-2010, 07:53 AM
  #3448
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Default RE: Bob Cat Copy Falcon 120 Jet

I am having some custom retracts and trailing link oleos made up..
These will support upto 15kg, arent too big, come with the entire air kit including regulator valve.
They are two way operation and Spring down under pressure loss (or can be spring-air style if you want).
just waiting to here back the cnc work is complete, once the trail units arrive I'll post some pics..

Rob
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Old 06-01-2010, 04:28 PM
  #3449
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Default RE: Bob Cat Copy Falcon 120 Jet

Hi every one had a great day at merryfield somerset with the jma

http://www.youtube.com/watch?v=GsRotaPDrLg

http://www.youtube.com/watch?v=xHVi0...layer_embedded

Aileron servos futaba S3305

elevator servos futaba S3102
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Old 06-02-2010, 03:20 AM
  #3450
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Default RE: Bob Cat Copy Falcon 120 Jet

if anyone needs just trailing oleo,s for the falcon.
we have got about 50 sets left that are in "raw"state
this means the upper parts are none anodised , and have no holes drilled.
the lower parts are anodised and predrilled.
they are in full length (163MM)
these are the "old"oleo,s now we make them with shoulder bolts.
these "old"have m3 bolts

pickup will be always 6mm (pre drilled in full lenth)
axle size 6mm
this includes 2 mains and one front..

so what you get is :

2 upper main struts ( none anodised blank alluminium)
2 lower struts (ready anodised)
2 springs
all bolts needed
1 front oleo in parts full length
NO axles
NO warranty , self build


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