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Skymaster 1:7.5 F-4 Phantom

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Skymaster 1:7.5 F-4 Phantom

Old 12-30-2021, 08:19 AM
  #376  
kevinthoele
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Originally Posted by YellowAircraft
Hi

What did you guys end up with for AUW and CG? I'm ready to test fire this P-180 and drive her around the cut de sac
donít know about weight but my 2 phantoms are at 340 cg
Old 12-30-2021, 08:58 AM
  #377  
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Originally Posted by kevinthoele
donít know about weight but my 2 phantoms are at 340 cg
same here, cg @340mm. Weight just a hair under 39lbs dry
Old 12-30-2021, 02:37 PM
  #378  
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Thanks!

Very interested in weights as I want to see if mine is fat or not.
Old 12-30-2021, 05:45 PM
  #379  
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Originally Posted by YellowAircraft
Hi

What did you guys end up with for AUW and CG? I'm ready to test fire this P-180 and drive her around the cut de sac
42.14lbs with an AMT Olympus HP. CG in pix attached.

Old 12-30-2021, 06:25 PM
  #380  
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Thanks, guys!
Old 12-30-2021, 06:57 PM
  #381  
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Hi,

Any of you opt for concealed/internal linkages on the wings?
Old 12-30-2021, 10:14 PM
  #382  
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Originally Posted by YellowAircraft
Hi

What did you guys end up with for AUW and CG? I'm ready to test fire this P-180 and drive her around the cut de sac
..



Originally Posted by Kevin_W
Here you go:

Battery tray, top


Battery tray. bottom



Nose gear, battery tray


Originally Posted by Kevin_W
More pics:


Switch and 3 air fill valves in front of center fuel tank. UAT and two receivers on top of center fuel tank.



Brake valve on the left



Retract, and door valves on the right side
Originally Posted by Kevin_W

Jetcat P180RX, fuel pump, ECU on the right side.



It came in just under 33 lbs with fuel in the UAT only.

CG recommendations varied between 300-340mm, I was shooting for 325, it came in at 333mm with no additional weight.
Old 12-30-2021, 10:35 PM
  #383  
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Originally Posted by Kevin_W
..
Wow!

Nice weight! Mine came in at 36.8 lb, but I'm looking at yours trying to figure out where you shaved that much off! Do you have the full cockpit? I've got a few doo-dads here and there (like an extra servo for the tail-hook), but nothing that adds up to 4 pounds!
Old 12-30-2021, 10:55 PM
  #384  
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Still gotta finish rigging this Jeti 2.4/900 thing up. The hook servo is under that tray.

Just need to tidy these leads up with zip-ties and velcro.


Old 12-31-2021, 06:17 AM
  #385  
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Originally Posted by YellowAircraft
Wow!

Nice weight! Mine came in at 36.8 lb, but I'm looking at yours trying to figure out where you shaved that much off! Do you have the full cockpit? I've got a few doo-dads here and there (like an extra servo for the tail-hook), but nothing that adds up to 4 pounds!
Yup, I was surprised that mine was that light too. I do have the full cockpit installed, but I donít have pilot figures in it, so that might be some of the weight savings. I also did not do any flite metal around the exhaust.
I do use Futaba S-bus, and I made my own harnesses, so there was some weight savings from that. It also balanced perfectly at 333mm without any need for lead in the nose.
Old 12-31-2021, 08:47 AM
  #386  
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Hi,

Have you guys had trouble with the struts leaking fluid?
Old 12-31-2021, 01:06 PM
  #387  
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None for me
Old 12-31-2021, 06:11 PM
  #388  
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Hey, Buck

Yeah, all three of these are leaky. Nose is worst. Other than tightening the screw, is there a trick?
Old 12-31-2021, 06:17 PM
  #389  
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Hi

So I'm building this bird for a customer and when i pulled the madking tape from the inner gear doors, the red wasn't as clean as I would have liked. I felt like a frustrated failure and was about to sand, re-tape and re-spray.... until I got a close look at ALL the doors on all the Navy birds with white inner doors with red borders. Jeez, looked like my 8-year-old daughter got drunk and did them with bucket and a fistful of straw!


Old 12-31-2021, 06:23 PM
  #390  
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Originally Posted by YellowAircraft
Hey, Buck

Yeah, all three of these are leaky. Nose is worst. Other than tightening the screw, is there a trick?
sorry amigo, I suppose you could take apart and install new orings.
Old 12-31-2021, 06:25 PM
  #391  
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Originally Posted by YellowAircraft
Hi

So I'm building this bird for a customer and when i pulled the madking tape from the inner gear doors, the red wasn't as clean as I would have liked. I felt like a frustrated failure and was about to sand, re-tape and re-spray.... until I got a close look at ALL the doors on all the Navy birds with white inner doors with red borders. Jeez, looked like my 8-year-old daughter got drunk and did them with bucket and a fistful of straw!


I wouldnít sweat it. Remember those things were painted by 19 year olds on the night shift. Overworked and under appreciated etc.
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Old 01-03-2022, 07:11 AM
  #392  
RCFlyerDan
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Default F-4 Video

Hey Guys!

Marvin was able to produce the video of my F-4. We were flying at Area 51, a privately owned field NE of Orlando. The video with just tanks is my 6th flight. Still trimming Flt Modes. The 7th Flight with full armament is my 7th flight.


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Old 01-03-2022, 06:40 PM
  #393  
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Great flight!
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Old 01-04-2022, 03:41 PM
  #394  
yeahbaby
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Originally Posted by YellowAircraft
Hi,

Have you guys had trouble with the struts leaking fluid?
also be sure to heat shield every airline beneath the engine and anywhere near the tail pipe.
Old 01-07-2022, 09:37 PM
  #395  
F16Jeff
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Default Interested in this Jet

Hi all, I have been following this thread for a bit. Currently building my second 1/9.5 extreme F4e. I want to purchase a larger one.
What is your thoughts of twin turbine vs single on this jet?
Do folks notice the scale discrepancies of the intakes vs cockpit location? Was it corrected with vs 2?
I have a FB 1/7 F15e twin to build after my F4e is completed.
Thank you in advance for your feedback.
Jeff
Old 01-12-2022, 02:07 PM
  #396  
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Originally Posted by yeahbaby
also be sure to heat shield every airline beneath the engine and anywhere near the tail pipe.

Buck,

I've got thick black gaffer's tape (the kind they use in theatre) holding the air lines down, then I've got the bottom half of the bypass clamshell trimmed down to go from the cool part of the engine to the inside front of the bell-mouth. The hot part of the bypass bottom has aluminum tape on it. Sound good or?
Old 01-13-2022, 03:00 PM
  #397  
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Yeah that’ll work amigo. Also, be sure to use a leaf blower post flight to reduce the radiant heat in the engine bay and aft towards the exhaust nozzles.
Old 01-15-2022, 05:55 PM
  #398  
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Originally Posted by yeahbaby
Yeah thatíll work amigo. Also, be sure to use a leaf blower post flight to reduce the radiant heat in the engine bay and aft towards the exhaust nozzles.

Thanks, Buck!

I'll have John (I built it for him) keep an eye on that, but the few times I've run it up the engine, the fuse seemed pretty cool afterward. Ambient, actually, except for right before the front of the tail-cones. Right there, it's just warm, but comfy to the touch. Right aft of the bell mouth, you can hold your hand an inch away from the pipe and not feel a thing. I know heat can 'soak' so I checked it about 30 seconds after shut-down, and it's a hair warm under the back half of the hatch (I guess from the engine exhaust cone), but otherwise still nice and cool. I guess I got lucky with my install!
Old 01-18-2022, 09:52 PM
  #399  
F16Jeff
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A big Thank You to Anton and John at Skymaster Jets for answering my questions about this jet. I will be joining this group with a 1/7.75 scale F4e Phantom in the Thunderbird scheme in 14 weeks or so I ordered the Airex version and will setup as a twin. It will be cool to see this one sitting next to my 1/9.5 scale F4e Phantom also done in Thunderbird scheme. Next I will begin selling some of my other stuff that I am not using or flying to make room for this one.

Now back to working on my smaller F4e.
Old 01-19-2022, 06:32 AM
  #400  
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Setting up as a twin? What engines do you plan to use?

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