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Skymaster 1:7.5 F-4 Phantom

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Skymaster 1:7.5 F-4 Phantom

Old 07-20-2018, 03:43 PM
  #51  
tp777fo
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Well it flew. Smooth rotation with about 1/2 fuel in fwd tank. Need to work some more on lateral balance and the cg coulfd actually be a little more aft. (About 335 now). Gear only came half up. Put them back down and flew with them down. I found a burned airline after the flight. Landed at TO flaps, just a hair nose heavy but I walked away from it. No damage except airline. Now to get the bugs out and paint.
Old 07-20-2018, 08:35 PM
  #52  
ozief16
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Congrats Tom. Itíll be a great airplane just stick with it. Seriously consider bypassing that front tank. It will cut serious weight as well as noseheaviness in the rotation and flare (depending on how you have the plane plumbed).

I always breath a sigh of relief once rolled out on final with the plane. Itís just that solid once established. I have been concentrating on my BV Phantom for the last little bit but need to get the SM back out as it really is impressive

Dave

ps- did you end up doing the scheme for the one you stepped out of?
Old 07-21-2018, 04:32 AM
  #53  
f106jax
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Congratulations Tom!
Old 07-21-2018, 09:45 AM
  #54  
tp777fo
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When I get around to paint it will be the one that I made into a fishing reef. I know when it rotated it was going to be a good flyer.
Old 07-21-2018, 12:05 PM
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JoelP
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“Fishing reef”�� That’s some kind of funny Tom! Congrats on the maiden.
Old 07-21-2018, 03:49 PM
  #56  
ozief16
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Funny Tom! Glad you made that decision. Itís sill my biggest fear is being late on pulling the handle should the time come

Dave
Old 07-21-2018, 06:14 PM
  #57  
tp777fo
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Trust me....when the time comes, it's the easiest decision you ever make.....enuf of this ****....time to go.
Old 07-22-2018, 10:22 AM
  #58  
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I am in the process of rigging the horizontal stabs on my Phantom at the moment. Skymaster recommends two 8711's (480 oz/in each). I am using Futaba S9177SV servos (512 oz/in)
I have been told (by an experienced SM F4 guy) that one 500+ oz/in servo is sufficient for the stab.
His reasoning being that there is no guarantee if one servo fails, that the other one will be able to overpower it since servos can fail in many different ways (although it has been a several decades since I personally had a catastrophic servo failure), and the weight savings could be significant since saving 2 ounces in the tail could eliminate the need for 2-3 times as much weight of lead in the nose.

The servos I am using are SBUS and can be fully programed to match each other, and can be programmed to "free wheel" on loss of signal, so excessive power drain shouldn't be a problem, and the danger (some) of one servo "locking up" and preventing the other one from operating is minimized.

What do other SM F4 owners think?
What size, and how many servos are you using on your F4's stab?

Thanks
Old 07-22-2018, 11:00 AM
  #59  
tp777fo
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2 JR 8711s
Old 07-22-2018, 12:12 PM
  #60  
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Call me old fashioned, but Iím going with what the manufacturer recommends. I have 2x8711 in mine. If I built another, Iíd also use two servos unless Anton says otherwise.

Last edited by dubd; 07-22-2018 at 07:26 PM.
Old 07-22-2018, 12:56 PM
  #61  
ozief16
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I used two MKS 777s. I really donít think the power is required, but on the *chance* I could bring it home on one I wanted to give it that chance. I ran both elevator leads in a very convenient location so I can unplug them one at a time to check each servo individually

Dave

ps-Thanks Tom. Iíve had a couple times where Iíve said ďoh crap itís todayĒ but was wrong (single engine)
Old 07-22-2018, 02:49 PM
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Kevin_W
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Thanks for the input guys. I'm gonna go with two S9177SV's.
Old 07-23-2018, 06:50 AM
  #63  
tp777fo
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Put in the bottom half of a bypass lined with ceramic blanket to protect all the good stuff and found a pinched vent line. Ready for test flt #2 after grandkids go home.
Old 07-28-2018, 02:44 PM
  #64  
tp777fo
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This is how I did my outer strut door. Seems to work well.
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Old 07-28-2018, 03:28 PM
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yeahbaby
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Did the stock setup not stay closed ?
Old 07-28-2018, 04:21 PM
  #66  
tp777fo
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Mine is a kit. Doors were my own problem.
Old 07-29-2018, 04:25 PM
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kevinthoele
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Buck No the little doors don't stay closed in flight. Works great on ground. On my new one coming I am going to see if I can put cylinder in to close
Old 07-29-2018, 05:50 PM
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tp777fo
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Removed the mains on mine today with a hard landing. Came in too hot and ballooned then it quit. There was NO glue holding the gear plates in. Just a small bead around the edge of the joint. Couple days in the shop and good as new.
Old 07-29-2018, 09:15 PM
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yeahbaby
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Originally Posted by kevinthoele View Post
Buck No the little doors don't stay closed in flight. Works great on ground. On my new one coming I am going to see if I can put cylinder in to close
ok I think Ozzie has had some great success with stock setup but he did add another hinge. I know of a guy who added a micro servo. I addded small rare earth magnets and they helped.
Old 07-30-2018, 06:54 AM
  #70  
kevinthoele
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Buck, Send me pic or post on how and where you put magnets

Last edited by kevinthoele; 07-30-2018 at 06:57 AM.
Old 07-30-2018, 08:09 AM
  #71  
ravill
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Those main gear mounts have been known to come apart with a hard landing. I've put screws all the way through before and tons of hysol to keep them sandwiched.

And FANTASTIC solution to keep the little outer doors closed!
Old 07-30-2018, 10:35 PM
  #72  
yeahbaby
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Kevin put them on the leading edge of the outer door you can recess them in the door slightly then fill in with aeropoxy or with bondo etc. use a second magnet or strip of metal inside the wing skin flange to provide adhesion.

Sorry no pix but can add them later once I make the mod, I like your technique though.
Old 07-30-2018, 10:38 PM
  #73  
yeahbaby
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You need to add CF or hardwood blocks to the main gear mounts and aeropoxy the crap out of the landing gear framework. Add CF plate to mounting rails and tap. Get rid of the wood screws.

JMO mind you. The stock setup will work but peace of mind is worth it.
Old 07-31-2018, 12:05 PM
  #74  
F106A
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When I got my kit they changed the aileron and flap horns from external to internal.
I contacted Anton as I was worried about flutter and he told me the internal horns work fine with no flutter reported.
Iíve got 8611ís on the ailerons and 8711ís on the flaps and there is no play but was wondering if anyone has heard of problems.
There doesní seem to be any hard points to mount external horns so I hope the present setup is OK.
Old 07-31-2018, 02:35 PM
  #75  
ozief16
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That would be nice. I had a buddy take some great photos and the only way you know itís a model is the horns on the wings

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