Originally posted by themudduck
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Official Freewing 90mm F-4 Phantom II Thread
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I had planned on doing a Thunderbird with my Phantom, started working on it this weekend. Finished the painting, now it's time for assembly. Thanks to Jeremy Solt for working out the kinks with the decals. Seems we both found the same sheet of decals and we of course went to the best decaler in the country. He picked up his plane first. Now it's my turn.5 Photos
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The Marines have landed. Modified 90mm EDF (JetFan 9B with 2250 HET motor running on a Roaringtop, 5100mah, 6S, 80C battery and CC 200A ESC) gets 3.5 minutes with 35% left. Beats any 8S system out there. Plane weighs 8 lbs and get 7.7 lbs of thrust at 7000' PA. Callie graphics. Weathering is next. Ready to buy 2 more when the gray ones come in!
Phantoms Phorever
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Originally posted by fieldofdreamsflyer View Post
Are you sure that didnt hapen when it crashed. If this was a issue , then there would be more jets crashing . Thats a very common set up and has been used for many many years. Another thing I would do is use a piece of fuel tubing on it so it keeps it from popiing off
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Originally posted by TPS View PostThe Marines have landed. Modified 90mm EDF (JetFan 9B with 2250 HET motor running on a Roaringtop, 5100mah, 6S, 80C battery and CC 200A ESC) gets 3.5 minutes with 35% left. Beats any 8S system out there. Plane weighs 8 lbs and get 7.7 lbs of thrust at 7000' PA. Callie graphics. Weathering is next. Ready to buy 2 more when the gray ones come in!
Phantoms Phorever
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Hey flash....same thing happened to me ystrdy on maiden flight, was trimming out and trying to turn to come back when it seemed I had the feeling of no up of down authority either, fortunately I went down on a hudge thicket of briers and landed on belly with barely any damage except for a few scratches from briers. Once back on table, I found the ball link was unattached and servo was not responding,pulled servo,put on servo tester and nothing, servo doesn’t work at all. Like you said, did the link come off in flight? With plane in excellent condition upon retrieval , I can’t see where the pretty soft landing could have caused this nor seem to have no explanation why servo is gone. This is definitely one to watch and investigate. I will definitely be using a better linkage for this servo once I get all redone, I really hope Motion will send me out another servo. I’ve already put in a ticket on this and as always their customer service is impeccable!!! Just very happy my beautiful bird wasn’t totaled due to this problem. Let’s hope we don’t start hearing more about this issue, maby post such as this will make guys more aware so we can nip this before there more unfortunate crashes.
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Well, I tried to maiden yesterday and was unsuccessful. The grass at our field was a little high and I was unable to get the plane in the air. I will try again next week at a better field.
On another note... where are most people setting the cg? I was wondering if I had mine set to far forward and that may be keeping the plane from rotating. I have it set right at the cg in the manual.
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So, finally got my F-4 in the mail, and since I'm a lazy bugger, I'll just ask:
What's the dominating consensus on cg and throws? (no offense to anyone, but I consider pilot experience a far better source than the manual - the latter seems to be more and more off lately)
Based on other recent FW models, I expect the rates too be far too high and the cg to be quite nose heavy.Freewing A-10 turbine conversion: http://fb.me/FreewingA10TurbineConversion
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Originally posted by janmb View PostSo, finally got my F-4 in the mail, and since I'm a lazy bugger, I'll just ask:
What's the dominating consensus on cg and throws? (no offense to anyone, but I consider pilot experience a far better source than the manual - the latter seems to be more and more off lately)
Based on other recent FW models, I expect the rates too be far too high and the cg to be quite nose heavy.
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Originally posted by Flash Jorden View Post
Mine was the same way after my crash, but I couldn't tell if it came off before or after the crash. I thought I had lost pitch control before the crash, but I couldn't be 100% sure. I'm going to change mine to a Z-bend now after seeing your post. Better safe than sorry. Maybe some fuel tubing over the rod keeper might help.
If I hadn't experienced the problem before the crash, I would be suspicious that it happened because of the crash. But I had definitely lost elevator control during flight. It wasn't the ball link, it was the keeper. A piece of tubing as a safety would be good but I am going to install a z-bend just for that extra margin.
JANMB - I only have a half-dozen flights so far. I started with the factory setup and dialed down the aileron a bit and after the maiden I did need a little more "up elevator" mix with the flaps. It flew absolutely beautifully and its very easy to land. I set up the 5000mah Admiral battery to be up against the floor of the front cockpit, which prevents it from going further forward (I did not saw the bottom of the cockpit off as Pilot Ryan suggested) and I thought it flew perfectly. I didn't measure the CG but putting the battery all the way forward will probably make it way nose heavy. I haven't had the opportunity to try moving the battery back. I expect with all the "up elevator" trim this model may, in fact, still be nose heavy. But it sure flies great the way it is.Marc flies FW & FL: AL37, MiG-29, T45,F4, A4, A10, F104 70 and 90, P38, Dauntless SBD, Corsair, B17, B24, B26 & P61, Lipp.P19, ME262, Komets, Vampire, SeaVixen, FMS Tigercat, FOX Glider & Radian XL.
Rabid Models foamies, including my 8' B17 & 9' B36... and my Mud Ducks! www.rabidmodels.com
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Look at this picture, and think of the G force being applied to that plastic part on every high speed turn.
At least turn the metal 180 degree bend upside down and let the G force be on the metal. Or, you can just go with a Z bend and be done with it.
Originally posted by fieldofdreamsflyer View Post
Are you sure that didnt hapen when it crashed. If this was a issue , then there would be more jets crashing . Thats a very common set up and has been used for many many years. Another thing I would do is use a piece of fuel tubing on it so it keeps it from popiing offBVM Bandit, EFlite Carbon Z T-28, EFlite Carbon Z Cub, EFlite Promethus, FW Avanti S, FW A-10 ThunderBolt, FW P-51 Mustang, EFlite Convergance, EFlite Carbon Z Cessna 150, EFlite Habu, EFlite Styker Q-F27, HSD Navy Super Viper
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Originally posted by themudduck View PostWell I have some news that you guys may be interested in. I had a crash today, very unfortunate, although the damage is not bad and that was only plain dumb luck. I was nearing the end of my second flight, flying level at half-throttle just 30 seconds before landing, when I noticed that something wasn't right. At the time I really had no idea what was going on - basically it wasn't responding to pitch and was rising by itself. It didn't want to level when I used a little "down". Before I knew it, the plane appeared to stall and then it acted like a "falling leaf" or like it was in a flat spin... right into trees. but then it pulled out (didn't hit anything) and then did a second flop, and hit the ground pretty much upright. It went into tall brush and damaged the nosecone and cockpit but everything else is OK. If had gone in nose-down then it would have been destroyed, no doubt.
Upon retrieval I discovered that the reason was that the stabilator was completely disconnected from the servo! This happened while I was flying, and I wasn't doing anything particularly violent or high-G, just regular jet maneuvers.
Interesting that it continued flying like this for several hundred feet. I don't know that I could have saved it, even if I knew what was going on. Anyway, I have it on the bench now and I took the rear cover off, this is what I found. I think that this is probably a high-stress connection and I think that a better connection to the servo arm should be considered. Nothing is broken, the pushrod just popped out. I'm posting so you guys can check yours. I think a Z-bend would be a better solution.
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I will bring this to Alpha's attention. Definitely something to examine that is for sure. I am going to check mine later today as well. Thank you for bringing it to our attention!My YouTube RC videos:
https://www.youtube.com/@toddbreda
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Originally posted by themudduck View PostI think a Z-bend would be a better solution.
Other options might be to use a small bushing with a grub screw for locking the rod in place, or better yet, replace the entire thing with a ball link.
Mudduck and Tired, thanks for the CG inputs. A great test is to see what she does at medium throttle when inverted. Does she require a lot of forward stick?
Freewing A-10 turbine conversion: http://fb.me/FreewingA10TurbineConversion
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Team Gross!
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