YellowAircraft
Posts: 3170
Joined: 1/5/2002
From: San Diego, CA, USA
Status: online
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Hi,
Sorry it's taken so long, but I actually wrote you a nice, long response just as my computer died. So, now that it's working again (though it's making all kinds of weird noises), I'll try again.
1. Don't silicone the servos in. Catspaw is right. Use conventional mounting methods. I don't know who wrote those instructions so many moons ago, but....
2. The fan unit should be in the center. I don't know how you got deformed bulkheads, but they shouldn't be that way. Fortunately, that shouldn't have too much of an effect on performance.
3. You can set your nose angle where you like it, so long as it is at least level. The FS A-4 sits very nose high, so I like to lengthen my nose struts accordingly, but the airplane will rotate fine with the bird sitting level.
4. I would never say you couldn't retrofit a turbine, but in this case, I would strongly discourage it. For one thing, you're talking about a VERY old kit. Who knows what condition the wood or the fiberglass is in. Second, out of all the jets out there, the Yellow A-4, especially the oldest one, wouldn't be anywhere near the top of my list of ones to convert. Don't get me wrong, I LOVE the Yellow A-4, but I just don't think it's a very good candidate for turbine retrofit compared to the other jets out there.
5. As far as Rx antennae go, I'm actually more concerned with running it along the pipe's length than near the engine. I've always routed mine externally, then secured it in some inconspicuous spot. I also like using base loaded whip antennae from Deans.
6. Look for a target weight of around 11 pounds. I've flown that plane all the way up to a 15 pound takeoff weight, but I've seen them built out at 9 pounds RTF, also. Obviously, the lighter, the better.
7. I've flown the A-4 at altitudes like yours with no problems. Again, keep it light. Make sure and do the aux air inlet so that your engine can suck some air from the nose gear door as well, otherwise you're going to need a lot of runway, and you may have problems with go-arounds. The A-4's inlets are very small, and the old kit was designed around a .45-size engine, so your .91 is going to have a hard time feeding.
Anyway, I hope this helps, and I'm sure there are lots of guys in here who've had a lot of stick time on this bird. Good luck, and feel free to call or email.
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Yellow Aircraft, JetCat Engines, Skymaster ARF+ and Turn Key Jets
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Yellow Aircraft A-4 questions - 
