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Bob Cat Copy Falcon 120 Jet

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Old 04-20-2009, 09:49 PM
  #2551
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Default RE: Bob Cat Copy Falcon 120 Jet

That looks awesome Joe. Supersport on this one too?

Cody
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Old 04-21-2009, 01:12 AM
  #2552
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Default RE: Bob Cat Copy Falcon 120 Jet

Hi Grodus, i am useing a wren 54 but it sounds about right with your setup as you seem to have your batteries farther forward than mine and also seems that you are useing two rx packs where i am useing just one high quality pack. I think with another pack mine would balance fine. I am going to fill the UAT to help the balance as this should never empty in flight anyway.

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Old 04-21-2009, 03:50 AM
  #2553
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Default RE: Bob Cat Copy Falcon 120 Jet

Joe

Can you keep a check on the wing weight's, I am quite shocked how heavy my wings feel after the work I did on them, I could loose some weight by using lighter retracts, but I fly from a rough pasture and need the spinging of the legs.

Mike
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Old 04-21-2009, 09:02 AM
  #2554
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Default RE: Bob Cat Copy Falcon 120 Jet

Steve, All the of my batteries are just forward of the engine mounting deck ( behind the main wing tube) so I was nose heavy without batteries. That's why is ssems a little odd to me if you are tail heavy , your engine should weigh close to the same as mine.
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Old 04-21-2009, 11:53 AM
  #2555
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Default RE: Bob Cat Copy Falcon 120 Jet

Steve,

That sounds about right. It all depends on how heavy your engine is and where you mount your equipment. With a Wren SS on mine I had both the ECU and RX batteries on each side of the nose wheel well to balance it. The only thing in the nose was my air tank. Don't add any lead, move the batteries forward if necessary.

Cody,

Fortunately all my equipment survived the mishap. So the Supersport is going on Falcon #2.

Mike,

Actually these wings seem rather light to me. I put extra glue where ever I could, beefed up the retract and servo mounts, and fully sheeted the wings. Plus Monokote is heavier than the original Chinakote. This one is their second generation ARF and everything seems to be lighter than the original. I had Springair retracts with wire struts on my first one. This one is getting Robart retracts and Prolink struts. With everything I'd guess these wings weigh about the same my first ones. If it helps I could weigh the wings.

Joe
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Old 04-21-2009, 11:56 AM
  #2556
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Default RE: Bob Cat Copy Falcon 120 Jet

Joe

Once you get the Prolinks in please do weigh then and let us know how much they come out at, I would be very interested in comparing mine to someone else's.

Mike
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Old 04-21-2009, 12:17 PM
  #2557
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Default RE: Bob Cat Copy Falcon 120 Jet

Mike,

I should have everything mounted in the wings within the next day or two. I'll post the weights then.

Joe
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Old 04-21-2009, 12:37 PM
  #2558
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Default RE: Bob Cat Copy Falcon 120 Jet

Thanks Joe, once you have posted your weights I will weigh mine and post as well, no matter what they weigh. LOL

Mike
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Old 04-21-2009, 01:29 PM
  #2559
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Default RE: Bob Cat Copy Falcon 120 Jet

Cheers Joeflyer,
im no fan of adding lead but if i cant get the batts any farther forward i will have to. Having said that i will fill the UAT and see if it balances which i think it might as its not far away anyhow.

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Old 04-21-2009, 02:22 PM
  #2560
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Default RE: Bob Cat Copy Falcon 120 Jet

Steveline9,

What's keeping you from moving the batteries all the way forward in the nose? You can pull out that first former if it's in the way, it's not needed anyway.

Are you using the recommended 330 mm. CG location? Let us know how it works out.

Joe

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Old 04-21-2009, 03:08 PM
  #2561
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Default RE: Bob Cat Copy Falcon 120 Jet

Hi Joe, have not removed the front former because im lazy...lol....i am planning on getting it ready for the weekend but the good news is that with the UAT full it ballances right on the 13" c of g mark give or take a mm or two. I am going to use your control deflections to set the model up. Did you use the wheel well covers? I have used mine but had to cut the bottom out of them leaving a considerable gap to the top wing skin. I dont think that too much high velocity air will enter the wing when the wheels are retracted. Thanks for your replies....very helpfull

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Old 04-21-2009, 03:16 PM
  #2562
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Default RE: Bob Cat Copy Falcon 120 Jet

Steve

You may know of Gregg Vesy who has a Falcon and fly's at Bickley, well his Falcon disintigrated in flight, can't be sure why, but he thinks it was the wings that blew apart, this may have been high pressure air into the wing through the wheel well, if you can block off the gap to the top wing skin to be on the safe side.

Mike
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Old 04-21-2009, 03:37 PM
  #2563
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Default RE: Bob Cat Copy Falcon 120 Jet

Was thinking the wheels will block the air flow into the wing as they are a very snug fit but also think you have a very valid point...these are not the strongest models out there and would benefit from takeing all the precautions possible.

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Old 04-21-2009, 05:58 PM
  #2564
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Default RE: Bob Cat Copy Falcon 120 Jet

Have a look on page 93 the Saisburys Steak and Kidney pudding basin fits well and could solve your problem.

Mike
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Old 04-21-2009, 06:54 PM
  #2565
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Default RE: Bob Cat Copy Falcon 120 Jet

I finished up my wings today. I used the supplied wheel wells.

Right wing - 1.030 kg. (2#, 4.5 oz.)
Left wing - 1.015 kg. (2#, 3.8 oz.)

Joe
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Old 04-22-2009, 12:08 PM
  #2566
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Default RE: Bob Cat Copy Falcon 120 Jet

Joe

Yes I thought mine was heavy they weigh in at : 1.211Kg, but they are the old version, if anyone else out there has an old version could you post your weights as well, would make an interesting comparison.

Mike
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Old 04-23-2009, 04:23 AM
  #2567
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Default RE: Bob Cat Copy Falcon 120 Jet


Quote:
ORIGINAL: BaldEagel

Steve

You may know of Gregg Vesy who has a Falcon and fly's at Bickley, well his Falcon disintigrated in flight, can't be sure why, but he thinks it was the wings that blew apart, this may have been high pressure air into the wing through the wheel well, if you can block off the gap to the top wing skin to be on the safe side.

Mike

Hi All

Mike. I know you spoke to my dad about the falcon but somewhere along the way the details have been missed. The wheel wells were in place and so that was not the cause. We are pretty sure that during an 'arrival' last year there must have been some undetected structural damage sustained which during a high speed run after the re-build....let go! The model had done many many flights with no issue until the 'arrival' caused by a flame out at the worst moment. The structural failure came during flight 4 after the re-build which to me is too much of a coincidence.

I have no concerns for the structural integrity of the model as a whole which is why falcon number 2 nears completion. Can't wait!

Gregg
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Old 04-23-2009, 04:32 AM
  #2568
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Default RE: Bob Cat Copy Falcon 120 Jet

Gregg

Thanks for clarifying that, I know that both your Dad and yourself are experienced builders, and for your Dad to have missed a potential structural failiure point after the arrival it must have been well hidden.

I have to admit it was suposition on my part about the high pressure air, that's why I said "this may have been high pressure air etc" nevertheless its good to get the whole story, especially that you think the Falcon is strong enough, I supose the message is just be carefull of any harder than normal arrivals and check out your structure in detail.

Mike
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Old 04-23-2009, 04:48 AM
  #2569
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Default RE: Bob Cat Copy Falcon 120 Jet

The main point is that the falcon went down behind trees and seemed to get away with it pretty well. The wings were almost undamaged other than the leading edge of one. However any impact can cause fractures and being that this is a film covered machine, those fractures can be hidden.
We didn't feel that the structure was not airworthy in any way but wanted to get as many flights on it at Bickley before considering taking it to a public event.

It seems we made the right choice!

Anyway, as said before, the new one is underway and really looking forward to getting it in the air

Gregg
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Old 04-23-2009, 08:20 AM
  #2570
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Default RE: Bob Cat Copy Falcon 120 Jet

My boom and tail section is ready to go.

Joe
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Old 04-23-2009, 10:53 AM
  #2571
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Default RE: Bob Cat Copy Falcon 120 Jet

Joe

That is rearly going to look good, have you got the RB stickers yet?

Mike
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Old 04-23-2009, 10:43 PM
  #2572
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Default RE: Bob Cat Copy Falcon 120 Jet

Mike,

I had a local sign shop make the stickers. They did a nice job. The fuse is finally painted, so there's nothing else holding me up. The weather forecast for the next couple of days doesn't look good for flying, so if I don't get too many distractions I should have it together in a few days.

Joe
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Old 04-24-2009, 05:57 AM
  #2573
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Default RE: Bob Cat Copy Falcon 120 Jet

Joe

I had a local vinyl sticker shop make up some Breitling logo's for my Edge, they did a very good job I must say, trouble is the thing flies so well I have not had time to finnish the red decoration that needs to go on it.

Mike
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Old 04-24-2009, 03:22 PM
  #2574
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Default RE: Bob Cat Copy Falcon 120 Jet

Had my first flight with Falcon 120 and Wren 54, it took it's self off and flew with no trim needed and done perfect landings, had a further 2 fights without any problems, on the forth flight I tried full flap at height without any problems and decided to land with full flap, I had a small bounce on landing and the falcon turned 180 degrees and landed on the canopy, have checked everything and I just need to get a new canopy, I will experiment with less than 45 degree flap next time, have 2 degree nose down on setup.
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Old 04-25-2009, 07:49 AM
  #2575
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Default RE: Bob Cat Copy Falcon 120 Jet

HI, I have done some more testing with my on board fire extinguisher and falcon 120. bob wilcox , jetcat USA told me how to set the ECU for hot start testing. All the smoke coming out of turbine after fire is extinguished is fuel pumping into turbine . here is a link to the test. http://rcuvideos.com/video/flame-out-test-2-mpg
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