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Yellow F-15 ARF Assembly Thread

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Yellow F-15 ARF Assembly Thread

Old 11-27-2009, 01:42 PM
  #201  
Shaun Evans
 
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Default RE: Yellow F-15 ARF Assembly Thread

Hi,

Really? You guys have lots of wing dancing? I've never experienced it with the F-15! I suppose it's because the places I've flown it have wind that's always right down the runway...and don't try to turn her with too much speed... Anyway, it's not just for looks that I bring the mains in, it's also for hard landings. You can bend those yokes pretty easily when they're splayed out like that.

Yes, the installation of the tail servos is challenging, but worth it not to have any linkage hanging out. For sure, leave the fins stock (removeable).

As far as lighting the Eagle is concerned, you don't really need to worry about internal structures. The wings and tails are simply balsa sheeted foam with a carbon cloth sandwiched in between. All of those same structures have molded fiberglass tips, but you can drill right through all of it with some care and without concern for weakening anything.

On the nosegear, the bigger light unscrews (just twist it hard), and the smaller light has a cross-headed screw on the backside of the lift arm.
Old 08-02-2010, 03:18 AM
  #202  
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Default RE: Yellow F-15 ARF Assembly Thread

Bringing this out of hibernation for a few guys.
Old 10-18-2010, 06:00 PM
  #203  
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Default RE: Yellow F-15 ARF Assembly Thread

Hi,

Maidened the latest F-15 ARF out at Pendleton yesterday. With a P-80SE, it was nice! Totally clean airframe (nothing hanging on it), so no extra drag. It flew like a P-120-powered one with ordnance. Really nice vertical and very fast (for an F-15) fly-by performance.

I set the timer for 7 minutes, and landed with the tanks about 40% full. Full-throttle most of the time. CG was at 7-3/4" back at the root (which is about 1/2" aft of recommended), and the plane required one click of left aileron and quite a bit of down elevator trim (probably because of the aft CG).
Old 10-18-2010, 06:08 PM
  #204  
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Default RE: Yellow F-15 ARF Assembly Thread

Did you change the pipe to accomodate the reduced thrust? What pipe does it have?
Old 10-18-2010, 06:22 PM
  #205  
Shaun Evans
 
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Default RE: Yellow F-15 ARF Assembly Thread

Hi,

No, it's got the stock Yellow A/C pipe, which is optimized for a P-120, but I doubt there's going to be any difference in efficiency of the pipe from a P-80SE to a 120.
Old 10-19-2010, 10:21 AM
  #206  
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Default RE: Yellow F-15 ARF Assembly Thread

Shaun,

did you reduce the elevator throw with the aft CG?


Thanks
Florent
Old 10-19-2010, 10:38 AM
  #207  
AlW
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Default RE: Yellow F-15 ARF Assembly Thread

Shaun,
I am 99% complete with my F15 and ready to set the CG so I was interested to see your post. When you set the CG at 7.75 inches what was the airplane configuration - UAT full - retracts up or down?
Thanks,
Al Watson
Old 10-19-2010, 12:44 PM
  #208  
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Default RE: Yellow F-15 ARF Assembly Thread

Florent,

I didn't reduce the throw, but I did add 25% expo on the elevator.

Al,

The configuration was UAT empty, tanks empty and gear down. All three gear retract forward, so all CG calculations should be made with the gear down. Hope this helps! BTW, what engine do you have?
Old 10-19-2010, 08:01 PM
  #209  
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Default RE: Yellow F-15 ARF Assembly Thread

Hi Shaun,
I have a P160se in my F15 - based on the one's I've seen fly that will be plenty of power. The manual says gear up for the CG check but I have seen all kinds of numbers with both gear up and gear down so thanks for the info.
Al Watson
Old 10-19-2010, 10:52 PM
  #210  
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Default RE: Yellow F-15 ARF Assembly Thread

Hi,

P-160, huh? Umm...yeah, that will be plenty of power

I don't know why the manual says that, given the fact that the gear all retract forward. When the gear come down, the CG shifts aft. I'll have them fix that typo....
Old 12-05-2010, 06:00 PM
  #211  
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Default RE: Yellow F-15 ARF Assembly Thread

Hi,

I got this latest one test flown. The video is VERY low quality and long....and the landing is a little bumpy, but it's a good flight and very good performance with the P-80.

[youtube]http://www.youtube.com/watch?v=LsJyJ8VtVqw[/youtube]
Old 12-05-2010, 07:42 PM
  #212  
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Default RE: Yellow F-15 ARF Assembly Thread

What was the weight without fuel?
Old 12-05-2010, 08:56 PM
  #213  
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Default RE: Yellow F-15 ARF Assembly Thread

Hi,

I actually haven't weighed it, but I'm guessing somewhere in the 25 pound area.
Old 12-06-2010, 04:17 PM
  #214  
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Default RE: Yellow F-15 ARF Assembly Thread

Hey,

Here's another video! This is a grainy, in-flight vid of some subsequent flights. Near the end there, I had a near-mishap when I pulled the flaps up instead of retracting the speed-brake and couldn't climb back out. Once I pulled my head out of my you-know-what, I retracted the speed-brake and she climbed out fine. The runway was wide enough to approach it a little cross-ways to land directly into the wind. Nothing fancy, just fun! It's just the little FlyCam unit.

[youtube]http://www.youtube.com/watch?v=DXPmCmUWozo[/youtube]
Old 12-06-2010, 05:11 PM
  #215  
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Default RE: Yellow F-15 ARF Assembly Thread

Hi,

Next flight, viewed fore to aft. Bumpy up there!

[youtube]http://www.youtube.com/watch?v=AF6AQcpSs2E[/youtube]
Old 02-24-2011, 11:41 PM
  #216  
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Default RE: Yellow F-15 ARF Assembly Thread

Really appreciate all the feedback, Shaun.  One question I have is regarding the power-plant.  Which would you recommend out of the P80-SE and P120 and why?  It seems feedback consensus is that the P80 provides enough thrust and that the F-15 being a naturally 'draggy' airframe 'aint going to be super fast anyway so how much benefit is there in spending the extra dosh on the P120-SX?  Is there much weight to be saved by using the smaller turbine and lighter required fuel load? Is this airframe pretty forgiving of higher weights?
Old 02-25-2011, 12:13 AM
  #217  
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Default RE: Yellow F-15 ARF Assembly Thread

Hi,

Well, that's a tough one. Mine flies on a P-80SE, and it flies great on it. Honestly, I don't think it would be any faster on a 120, although it would have better vertical. I can get more than 8 minutes of full-throttle flight on the stock fuel tanks with the P-80, so I appreciate the fuel economy. As for higher weights, the plane won't weigh any more with the 120 than it does with the 80, but yes, the airframe can fly very heavy. If I had my choice, I'd stick with the 80 on it. Just my choice.
Old 02-25-2011, 02:34 AM
  #218  
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Default RE: Yellow F-15 ARF Assembly Thread

Thanks again Shaun. Are there any other arguments either way regarding the choice between the P80 and P120? Is additional residual thrust on final approach an issue with the 120? Does it need the 120 for good vertical? Do you find yourself using high throttle settings all the time using the P80 in your F-15? Is the additional fuel consumption of the 120 going to be much of an issue?

Cheers.
Old 02-25-2011, 08:30 AM
  #219  
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Default RE: Yellow F-15 ARF Assembly Thread

Absolutely no residual thrust issues on mine and I have a 120 in it. Good vertical. I am not out for all out speed, just scale performance and I vary the throttle on mine alot during a flight. There is loads of fuel onboard to accommodate the 120. Flight times will not be an issue either. You can't go wrong either way.

Hope that helps.

Craig.
Old 02-25-2011, 09:04 PM
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Default RE: Yellow F-15 ARF Assembly Thread

I have two JC Rabbits in mine and there are not any residual thrust issues.....and unlimited verticle of course!
Old 02-25-2011, 09:11 PM
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Default RE: Yellow F-15 ARF Assembly Thread

Thanks for the last few replies, people. Gut feeling and general consensus seem to agree that less isn't always more. That word 'vertical' keeps coming up too. In keeping with the scale machine perhaps the 120 will do it most justice. Really appreciate the feedback from those that havel already 'been there, done that'. Thank you.
Old 02-26-2011, 12:02 AM
  #222  
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Default RE: Yellow F-15 ARF Assembly Thread

I have a 120 in mine, I would not hesitate to go with with the 120 again.
In addition to the points made by the others which I agree with. The 120 can be maximum RPM limited, I think a 120throttledback to 80powerlevel is more fuelefficientthan an 80 at full throttle. Also it gives you a wider model choice for the turbine in its next model
hope this helps
Ian
Old 02-26-2011, 12:10 AM
  #223  
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Default RE: Yellow F-15 ARF Assembly Thread

Yep,

For sure. The difference in price is the only downside. If it's all the same to you financially, there's no reason at all not to install the 120.
Old 08-23-2011, 01:23 PM
  #224  
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Default RE: Yellow F-15 ARF Assembly Thread

Hello Shaun

finally started on the F-15. I noticed that the main struts
bottom out to the secondary spring with only the turbine
installed. I realize this a progressive damping system
but seems the first stage is very soft. just checking as I see no threads
relating to this

Thanks
John B
Old 08-23-2011, 07:42 PM
  #225  
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Default RE: Yellow F-15 ARF Assembly Thread

Doksa, mine are like that as well. I don't like how soft the springs are and was thinking about swapping them out for a stiffer set.

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