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-   -   Bob Cat Copy Falcon 120 Jet (http://www.rcuniverse.com/forum/rc-jets-120/5913492-bob-cat-copy-falcon-120-jet.html)

rcguy! 09-26-2007 06:08 PM

RE: Bob Cat Copy Falcon 120 Jet



here is a nice trick i learned to get a geometric lock of the flap when it is in the up position - hope this might help you guys out with your setups.
Check out the angle of the servo arms of the flap servos.

Should have moved the flap control horn back away from the hinge line for better geometry!


i3dm 09-26-2007 06:12 PM

RE: Bob Cat Copy Falcon 120 Jet

im not the builder of that plane, but i always install control horns next to the hinge line also.

Woketman 09-26-2007 08:31 PM

RE: Bob Cat Copy Falcon 120 Jet
Didn't someone here say that they found some aluminum wing or boom bolts? Thanks.

tim777jet 09-27-2007 04:47 AM

RE: Bob Cat Copy Falcon 120 Jet
Ally bolts, i used were, M6 x 25 AL/ALLOY SKT/HD capscrew 7075 oai sc5 and M6 x 70mm AL/ALLOY SKT/HD capscrew 7075 oai sc5

Price was £12.40 for 10 of the first number and 20 of the second.

Nylon and Alloys LTD 0208 579 6986.

You will need to cut down one of bolts where it passes through the front boom mount hole.

Cheers Tim

bruce88123 09-27-2007 06:18 AM

RE: Bob Cat Copy Falcon 120 Jet
www.microfasteners.com for aluminum hardware

rcguy! 09-27-2007 06:31 AM

RE: Bob Cat Copy Falcon 120 Jet

ORIGINAL: bruce88123

www.microfasteners.com for aluminum hardware
Did I miss the M6 by 70 aluminum ones?


i3dm 09-27-2007 06:46 AM

RE: Bob Cat Copy Falcon 120 Jet
Why not use standard steel bolts ?

Woketman 09-27-2007 06:52 AM

RE: Bob Cat Copy Falcon 120 Jet

I can't find a lot of aluminum metric hardware at Microfasteners.

i3dm 09-27-2007 06:57 AM

RE: Bob Cat Copy Falcon 120 Jet
How much weight will you shave off using aluminum bolts instead of steel ?

bruce88123 09-27-2007 07:00 AM

RE: Bob Cat Copy Falcon 120 Jet
From their site:

If you are having problems finding a product or products, or have questions, please do not hesitate to give us a call at (800) 892-6917, fax us at (908) 236-8721, or send us an e-mail at info@microfasteners.com.

Companies don't always show their entire inventory in their online catalogs. Only their most popular items and new stuff.

Woketman 09-27-2007 12:34 PM

RE: Bob Cat Copy Falcon 120 Jet
More than zero ounces. Thanks Bruce.

i3dm 09-27-2007 12:50 PM

RE: Bob Cat Copy Falcon 120 Jet
1 Attachment(s)
The first Falcon in Israel, belongs to Ilan Zissu. Here it is with the happy owner. JJ1400 for power.

i3dm 09-27-2007 02:02 PM

RE: Bob Cat Copy Falcon 120 Jet

For Ilan, can anyone list the hardware that we need to change to steel \ aluminum bolts ?

SJN 09-27-2007 07:39 PM

RE: Bob Cat Copy Falcon 120 Jet
i3dm, where did you buy the Falcon ?

i3dm 09-27-2007 07:58 PM

RE: Bob Cat Copy Falcon 120 Jet
me and my friends made a shipment directly from China (Fly Model factory).

we paid for falcons with retracts (their own brand, look good in pics!) and so far the retracts are NOT here yet !! [:@]

Gary Travis 09-28-2007 05:08 PM

RE: Bob Cat Copy Falcon 120 Jet
Have any of you had any luck ordering from Nitro Models? I have tried the phone number quite a few times with no luck. The only thing I get is eternal hold!! Any suggestions on the best place to order a 120 in the US

Woketman 09-28-2007 05:25 PM

RE: Bob Cat Copy Falcon 120 Jet
The web site!

Gary Travis 09-28-2007 06:12 PM

RE: Bob Cat Copy Falcon 120 Jet
I understand the website, however it will be an order for several units so I prefer to speak with someone directly.

jetflyrf86 09-28-2007 06:28 PM

RE: Bob Cat Copy Falcon 120 Jet
Regarding wing boom bolts, simply tap the blind nuts with an 8-32 tap. Easy to do as the metal is on the soft side. Therefore you can use 8-32 cap screws with no problem.
Hal Peters

Woketman 09-28-2007 08:09 PM

RE: Bob Cat Copy Falcon 120 Jet
Gary, the original canopy that came with mine was cracked. I called the number on the web site and had no problems speaking to someone. New canopy is on the way! Great service. They did have odd hours though. I think they did not open until 12 noon Pacific time, or something like that.

Gary Travis 09-28-2007 09:43 PM

RE: Bob Cat Copy Falcon 120 Jet
I called from about 1:00 to 4:00 pacific time and all I got was some not so great music and a message saying they were trying to connect the call. Maybe it was day off time. I placed the order anyqay over the web we'll see how it goes.

BiGToP 09-29-2007 06:37 PM

RE: Bob Cat Copy Falcon 120 Jet
Almost finished:;)[8D]



tim777jet 09-30-2007 05:46 AM

RE: Bob Cat Copy Falcon 120 Jet
Had three excellent flights yesterday, I made a few changes since my last flight. I fitted spring back struts on the mains, like the Jet-1A type. I saw someone on this site had fitted them but no info on what type. I also contacted Digitec to work out which ones would fit. No answer. I think they are crazy, because these models are going to be really popular. The field I am flying from is grass, so decided that to proplong the wing and fuse structure, I definatly needed better legs. I bought 2 legs from Motors and Rotors, they are made by AT, I had to mod them to fit. A lot of milling and cutting down.
They work great, they take a lot of punishment away from the undercarriage mounts, very impressed. Will post some pics later and try to upload some vid footage on youtube later.
My lipo batteries for ECU and radio are as far forward as possible, as my home made engine is heavier than your manufactured ones, to get the correct the CG. I had made up a rail system to hold them, but for ease of removal, I have now taped my carbon rail holders directly to the air tank, so I just pull the tank out, complete with batteries for charging and balancing. I also found a really easy way to hold the tank in, a simple spring and clip that clips around the air tank supply pipe. real easy.
Flights were @ 7.5 mins, so about 9 min run on the engine. I use just a 1320 ma lipo for the jet ( for weight reasons), so with starter motor giving the lipo a battering, I tried a different soloution. I soldered on another lead to the power lead just as it enters the ECU. When i start, I plug an old Nicad pack into this fly lead. I start the engine and as it acelerates through its idle rpm up to its calibrating speed, I quickly switch on the onboard lipo pack and imediatly unplug the nicad pack. After landing, after shut down , I plug the nicad in and imediatly switch off the lipo, so cooling runs are from the nicad. This way I fly many times without recharging.
My 1320 Lipo reciever pack was fine after 3 flights, the excellent Align regulator voltage LEDS had dropped just 1 indication, so hadly any consumption.

With the flaps, had a slight amount of up programed in with 20mm flap. This is not reqiuered and causes the model to ballon slightly. With no elevator input it is just right. Have to try the full 45 degrees yet.

For info, my Undercarriage and heavier wheels, have added a bit more weight. With a full UAT, dry weight is around 14.5 pounds. Engine puts out about 13 lbs thrust. Fuel is around 3.5 pounds. On the grass there is lots of drag. The model will accelerate to a set speed then will go no faster. Feed in a little up, and the model accelerates rapidly and smoothly lifts off on its own accord. On landing the stoping distance is really short due to the grass. No brakes required. Model is docile and rock steady, can be slowed up to unbelivablely slow speeds and yet you can throw it arouond. I am still getting aquanted with my model and love it.
Cheers Tim

figueroa 09-30-2007 07:27 AM

RE: Bob Cat Copy Falcon 120 Jet
Great review Tim and congratulations on your maiden.
Good luck.

tim777jet 10-01-2007 03:59 AM

RE: Bob Cat Copy Falcon 120 Jet
Hi guys Try this link. Will try to post another soon,


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