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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)

BaldEagel 06-22-2014 02:44 AM

Didn't know that Kingtech made a gas start turbine, very retro ;)?

Mike

4ptroll 06-22-2014 03:49 AM

Nice job ! I have well over 100 flights on my falcon with the same turbine. She doesn't look as good as she used too :) but it is old faithful and the plane I fly the most. I'm getting ready to build my 3rd one.

ticketec 06-22-2014 04:27 AM

5 Attachment(s)
Quote:

Originally Posted by SeaHawk-RCU (Post 11827462)
Here are some pics of the "Sea Falcon" on first assembly.
Everything went together well and all is on track for certification inspection and flight on Tuesday at Tingalpa Model Aero Club.
My old Falcon has been repainted by new owner Richard and hopefully should fly the same day.


The blue is darker than it looks in these flash affected pics.
Canopy from Ken at KMRC Jets, Cockpit tub from Ed edwarda 10pilot finished brilliantly by my son Michael.
Retracts and struts are hobbyking. Turbine is gas start Kingtech K80.
Electric power is two x 3 cell 1800mah LiFe batteries through a regulator (RCCSKJ black). A 2 cell 3000mah LiFe runs the turbine.and accessories.
Servos are Corona metal geared digital except for ailerons which are slimline Turnigy.
Blue paint is, ironically, Ford Falcon blue. Heh heh. Wings are fully sheeted and covered in film.
Two sets of nav lights are installed with a controller in each wing. All I need to run to the wings for the lights is 5v.

I will take some more pics on Tuesday.

Col

Hey Col,

I kept an eye out for you at Maryborough Jet's but didn't see your falcon 120??

It was a cracking weekend! the weather was perfect. I finished the repairs but not the final colour scheme for mine, But seeing as I didn't run into you I'll show you how far I got ;) you'll see why I was careful, Mine is going into the other sides colours :p:D The scheme, even it was blue and grey was pretty visible. I've got to go to Melbourne tomorrow and then in Sydney all of the following week, but now as the rush is over, I'll finish the wings, and then do the fuse and booms in the final colours.

I did have my top and bottom strobes working and I've had a landing light on the nose gear for the last few years. How many watt's are you lights? mine a 1w LED's and the falcon was just too quick to see the strobes for most of the day.

Managed about 5 flights with her over the weekend, so it was all good!

Thanks

dave

toolmaker7341 06-22-2014 09:03 AM

How many degrees down thrust are you using and any down elevator needed with flap deployment?

edwarda10pilot 06-22-2014 01:21 PM

Quote:

Originally Posted by toolmaker7341 (Post 11827649)
How many degrees down thrust are you using and any down elevator needed with flap deployment?

I am not sure what the other folks are using but in my NavyCat (nee falcon) I am using 6 deg. of down thrust. I am flying mine with an 18 lb. thrust motor and there is no pitch trim change with the 6 deg. of down thrust at any of the throttle positions. With 45 deg. of flaps for landing I am programming a little more than 1/8" (more like 5/32") of down elevator.

Ed

SeaHawk-RCU 06-22-2014 02:49 PM

Dave:

Ahaa,

A Suckhoy SU120 Falconovitch.

I look forward to intercepting it over the North Sea (Logan River??) soon. :)

That scheme looks great Dave.

Didn't get finished in time for Maryborough :(.

toolmaker:

I used 3 degrees of tailpipe down on my old one and 5 degrees on this one. Same elevator to flap setting as yours Ed. I think that they are all pretty similar.

Mike:

I think the original K80's were gas start. K80E ??
I like the gas start, very reliable starting each time but means you have to carry extra gear.

4ptroll:

Thanks, I like the airframe, very versatile. :)

Col

BaldEagel 06-23-2014 12:51 AM

Just to throw this into the mix, I did not use any down thrust on my Mk I Falcon and it flew fine, no pitch changes with speed or any bad habits, The first Falcon builders put the down thrust in to get the efflux away from the tail and its seems to have become folk law now.

Mike

SeaHawk-RCU 06-23-2014 02:59 AM

2 Attachment(s)
Hello Mike,

I am increasing the mount angle in this latest Falcon to counter the angle of the engine mount deck. Both my Falcons were version one and the angle of the rear deck to the bottom of the fuselage was different between the two.
I have not flown a Falcon with no "downthrust" so I will take your word for it. :)

Down to the field this morning for engine run. For starting I have a piece of metal house downpipe with four angle aluminium legs riveted to it. I stick the legs into the ground and back the engine outlet up to it. Luckily I decided to use it today as each attempt to start resulted in a very wet start and much flame from the engine, through the downpipe and a foot or so out the back. Each attempted start ended with an overtemp and shutdown before the start cycle completed. After conversing with Phil the turbine man I will adjust the start ramp downwards and try again.

Cheers

Col

http://www.rcuniverse.com/forum/atta...mentid=2007962

Xairflyer 06-23-2014 04:25 AM

I would agree with mike I have no idea what I have on mine just angled the tailcone down slightly to protect tail

Dr Honda 06-23-2014 04:57 AM

Quote:

Originally Posted by BaldEagel (Post 11828110)
Just to throw this into the mix, I did not use any down thrust on my Mk I Falcon and it flew fine, no pitch changes with speed or any bad habits, The first Falcon builders put the down thrust in to get the efflux away from the tail and its seems to have become folk law now.

Mike


Yep... I run zero pitch on my mount... and she fly's great. There MAY be a pitch change at full throttle... but since the Falcon wasn't meant to go 200 mph... I've never held the throttle open long enough (in a straight line) to feel any issues.

edwarda10pilot 06-23-2014 08:19 AM

Quote:

Originally Posted by SeaHawk-RCU (Post 11828141)

Down to the field this morning for engine run. For starting I have a piece of metal house downpipe with for angle aluminium legs riveted to it. I stick the legs into the ground and back the engine outlet up to it. Luckily I decided to use it today as each attempt to start resulted in a very wet start and much flame from the engine, thought the downpipe and a foot or so out the back. Each attempted start ended with an overtemp and shutdown before the start cycle completed. After conversing with Phil the turbine man I will adjust the start ramp downwards and try again.

Cheers

Col

http://www.rcuniverse.com/forum/atta...mentid=2007962

Col:
I am sure you will get it figured out. I have an interesting story regarding my "exhaust pipe" for my Navy Cat. Last year I sold my turbine trainer and with it I sold my "exhaust pipe" similar to the one you and others have. Well, when I got the Navy Cat I needed a new pipe. SO off to the hardware store I went and I bought a nice shiny piece of 4" pipe. I mounted it to my base (as I had done with the previous 0ne) and off to the field I went. I proceeded to start my engine and after about 15 seconds parts of my "exhaust pipe" started melting. I quickly shut the engine down. After looking things over I discovered that I had accidentally bought an aluminum tube rather than the galvanized steel one I previously had. Anyway, my disintegrating exhaust pipe is still talked about and I am duly "criticized" and teased about my aluminum exhaust pipe. Moral of the story, DO NOT buy aluminum tube for your tail pipe. :)

Ed

SeaHawk-RCU 06-25-2014 01:17 AM

That would have been an interesting sight Ed. :) The flamethrower problem has been sorted. The culprit was a remote "switch" I was using in the +ive line to the pump. The switch was feeding receiver power to the pump as soon as fuel ramp started resulting in a spectacular show. Bypassed the switch and all worked normally. It will be replaced with a proper relay ASAP. Latest estimate for inspection and first flight is on Saturday morning.

Col

ticketec 06-25-2014 02:26 AM

Quote:

Originally Posted by SeaHawk-RCU (Post 11827857)
Dave:

Ahaa,

A Suckhoy SU120 Falconovitch.

I look forward to intercepting it over the North Sea (Logan River??) soon. :)

That scheme looks great Dave.

Didn't get finished in time for Maryborough :(.

Col

;);):D I was chuckling for ages.

Whatdayamean SUCKhoy?? :D

It was actually more visible than what I expected. She's still at my mates house because he had the fuse and wings in his car, but I have 5 weeks to finish it before the maryborough airport event! Didn't get a chance to fit the UAT, but I think I'm going to but a C.A.T. instead as it will fit into the model way easier.

Thanks

dave

toolmaker7341 06-25-2014 04:29 AM

Mine is a Suckoy SU69 Siberian Saber

edwarda10pilot 06-25-2014 02:43 PM

Col:

Yeah, it was concerning at first until we figured out what was going on and then it was amusing .:) I got my engine back from the maint. shop yesterday and got it in the plane today. Engine run was fine so I may be able to maiden it and the new Navy Cat this weekend.

Best of luck on your inspection/maiden flight.

Ed

SeaHawk-RCU 06-26-2014 04:37 PM

Hello all,

I am in need of JR setup advice.
I am using a JR PCM9XII and have added down elevator to compensate for flap deployment. In the old Falcon I had the elevator compensation moving proportionally to the flap but I forgot how I did it.
Currently I have flaps deploying full travel in 1.5 seconds but the down elevator happens instantly. Any experts out there that can help?

Col

edwarda10pilot 06-26-2014 06:32 PM

Col:
I used to have my flaps on the servo slow (let them extend over a few seconds) but my elevator was instantaneous. Every time I deployed the flaps I had to "fly thru" the down elevator until the flaps were down. If finally decided to take the servo slow function out to the flaps and made the flaps and elevator instantaneous. Solved my problem. Might consider letting the flaps down immediately.

Ed

SeaHawk-RCU 06-26-2014 09:14 PM

Quote:

Originally Posted by edwarda10pilot (Post 11830682)
Col:
I used to have my flaps on the servo slow (let them extend over a few seconds) but my elevator was instantaneous. Every time I deployed the flaps I had to "fly thru" the down elevator until the flaps were down. If finally decided to take the servo slow function out to the flaps and made the flaps and elevator instantaneous. Solved my problem. Might consider letting the flaps down immediately.

Ed

Thanks Ed,

I found the solution. In the JR 9XII "Flap System" menu is a delay setting. I set that to 1.5 seconds and now the flap and the elevator compensation happen together.

Col

SeaHawk-RCU 06-27-2014 10:26 PM

3 Attachment(s)
Well today was the day.

Was at the field early this morning and, along with Richard, set up the two "Sea Falcons" for their certification flights. Phil the turbine man turned up, the weather was perfect and we were out of excuses Richard was the first cab off the rank. He fired up his kero start K80 and taxii'd out on the strip. A 40m roll and he was airborne. After the addition of some up trim he flew a perfect test flight ending with a greaser of a landing.

My turn, the gas start K80 started easily and out to the strip we went. After a slightly longer takeoff roll followed by application of a fair bit of elevator she rose into the air for the first time. Richard did the honours with full back trim on the elevator and it was almost trimmed level. By this time I had completed a circuit that was less than impressive as I had left way too much aileron movement dialed in resulting in lots of wing wagging. Ok, got the gear up and told the thumbs to be gentle. Flying nice and smoothly now so a slow roll then a loop. Tried to go over the top on cruise power (about 1/3rd throttle) and mushed over. Next circuit I tried a fast aileron roll. Brisk is not the right word here,, it rolled way too fast. Time for the flaps. I had followed the instructions for the flap mod by changing left for right and fitting upside down. This along with surface hinging, allowed plenty of flap travel and I had set the model up with about 60 degrees of flap. With plenty of height Richard selected full flap for me as I controlled the elevator. No problem, slight change in flight attitude and all good. Because of the extra flap movement I came in higher and pulled power slightly later than I am used to but the flaps did their work and the "Sea Falcon" settled back onto the strip. Big smiles all around.

Some adjustments to the elevator neutral point and aileron travel and she should be as much of a delight to fly as the previous Falcon. Below are some pics taken after the two proving flights.
Richard's is the grey/white one, mine is blue/white.

Col

http://www.rcuniverse.com/forum/atta...mentid=2009390 http://www.rcuniverse.com/forum/atta...mentid=2009391 http://www.rcuniverse.com/forum/atta...mentid=2009392

edwarda10pilot 06-28-2014 05:55 AM

Col:

Congratulations to you and Richard on successful first flights. I am sure there are many more to come. The planes look really nice in the new livery.

Ed

jzuniga 06-28-2014 08:23 AM

Congrats…. There is nothing more rewarding to me, than seeing the fruits of your labor come out so nicely...
very nice looking birds!

SeaHawk-RCU 06-28-2014 05:31 PM

Thanks Ed, jzuniga.

Looking forward to the next flight.

Time to start work on the Jetlegend CT-114 that has been waiting patiently for it's turn. I can only afford one engine though so it will (hopefully) be a slow build. :)

Col

red76ta 06-29-2014 04:25 PM

Congratulations and happy flying!

4ptroll 07-08-2014 04:11 AM

Does anyone know where to get a replacement canopy for the Falcon? Any info is appreciated. Thank You

edwarda10pilot 07-08-2014 04:27 AM

Quote:

Originally Posted by 4ptroll (Post 11837654)
Does anyone know where to get a replacement canopy for the Falcon? Any info is appreciated. Thank You

You can order one from Keith at Park Flyer Plastics : http://parkflyerplastics.com/cart/in...roducts_id=694

The canopy is good quality and very clear.

Ed


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