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Official Freewing 80mm A-4E/F Skyhawk Thread
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Originally posted by farmflyer View PostDave I missed the discussion about expo share it with us. I'm curious about what Mike had to say about this being a self taught flyer I can always use more information.
Currently flying: Twin 80mm A-10, 80mm F5, 80mm A6, 70mm Yak-130, 70mm F-16v2,90mm Stinger 90, 70mmRC Lander F9F, Flightline F7F TigerCat, Phoenix 46 size Tucano, Flyzone L-39
Out of Service: 80mm Mig-21,64mm F-35, 64mm F/A-18
I Want: 80mm A-4, twin 80mm F4J Phantom
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Yeah,
Finally, an explanation that makes sense. Going back on other planes to adjust the mushiness. LOLCurrently flying: Twin 80mm A-10, 80mm F5, 80mm A6, 70mm Yak-130, 70mm F-16v2,90mm Stinger 90, 70mmRC Lander F9F, Flightline F7F TigerCat, Phoenix 46 size Tucano, Flyzone L-39
Out of Service: 80mm Mig-21,64mm F-35, 64mm F/A-18
I Want: 80mm A-4, twin 80mm F4J Phantom
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Just watched the video and enjoyed it - I think this is a very useful technique, and I had not seen it before. Its certainly important to find out if you're inadvertently engaging other channels just like Capt. Mike explained. An eye opener! It should be really useful to do this test and fix that "inadvertent engagement" if it exists. (makes me wonder if I do that!)
But I feel pretty strongly that this is not the only purpose for using expo.
As Capt. Mike said at the beginning of the video, expo "deadens" the stick. Well in addition to fixing the "inadvertent engagement" problem, expo can be useful if you're flying a very sensitive aircraft. High-speed aircraft with very sensitive controls can be almost impossible to handle without expo. Take the little Durafly ME163 for example, or a 3D airplane with 90-degree throws. Without expo these planes are virtually impossible to fly at high speeds. In other words, expo limits the response around center, which can be VERY important for certain planes especially when they're going fast. Anyone else agree?
With super sensitive planes (mainly ones that fly really fast) I have used up to 75% expo. For most of my planes I use 30-35% but sometimes I dial it up a bit until the sensitivity is where I need it to be. I like to fly my warbirds scale (smoothly) but sometimes you need that extra (full) control throw to do tight maneuvers and expo is perfect for that. If the plane reacts too fast you can create a high-speed stall and expo can help control that.
Obviously we could get 100 different opinions about this. I'm not saying anyone else is wrong!! Like Capt Mike said, this is really up to each pilot to adjust to his own style. And kids these days... I've seen some use negative expo to make their planes hyper sensitive!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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By the way I've been wanting to mention this, maybe it fits in with my previous post. Have any of you noticed this with the Skyhawk.... it rolls like its a freaking drill when you use full aileron at high speed, but I find that after 3-4 revolutions it does some kind of strange wiggle and pitch-up when I stop the roll. I'm not sure what's going on but I think maybe the wing stalls after several revolutions. I do NOT see this when I do rolls at "normal" speeds. Anyone else notice this?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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Originally posted by seaviper View PostThat's probably coupling as your stick comes back from being pegged over. The further you move the stick, the more chance of adding in a little movement on the elevator.
Ehh, who knows. Maybe I'm accidentally hitting the elevator.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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Originally posted by RCjetdude View PostCould you be dealing with a a high amount of centrifugal force and an above or below vertical canter of mass? At a high rate of roll to could throw it into an out of control situation I would think.
Not a big deal, just curious. I've never seen this on any other planes (for example my 90mm F104 will roll like it's on a string all the way across the sky).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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Originally posted by Skypilot66 View PostHow do you like your 90mm F-16 eff??? Any build or physical flaws???
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Originally posted by themudduck View PostBy the way I've been wanting to mention this, maybe it fits in with my previous post. Have any of you noticed this with the Skyhawk.... it rolls like its a freaking drill when you use full aileron at high speed, but I find that after 3-4 revolutions it does some kind of strange wiggle and pitch-up when I stop the roll. I'm not sure what's going on but I think maybe the wing stalls after several revolutions. I do NOT see this when I do rolls at "normal" speeds. Anyone else notice this?
I will take my 90mm F-16 over this little scooter any day, love flying the F-16................:)
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I am running high rates on everything, 15% expo on ailerons, 20% expo on elevator, elevator-to-flap mixing as per the book. Just about perfect in my opinion.
The A-4 is actually a delta wing and has a very short span with big ailerons. It will roll like no tomorrow. If you're going to go and do those drill bit rolls and 20G pull-ups like its a park foamy, then you will be talking about your A-4 in the past tense soon enough.
Also those ailerons give you some adverse yaw. That is what you are seeing along with coupling.Meridian Aeromodelers, Meridian MS
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Originally posted by seaviper View PostI am running high rates on everything, 15% expo on ailerons, 20% expo on elevator, elevator-to-flap mixing as per the book. Just about perfect in my opinion.
The A-4 is actually a delta wing and has a very short span with big ailerons. It will roll like no tomorrow. If you're going to go and do those drill bit rolls and 20G pull-ups like its a park foamy, then you will be talking about your A-4 in the past tense soon enough.
Also those ailerons give you some adverse yaw. That is what you are seeing along with coupling.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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I just hit 26 flights on the A-4 today! Flew my first formation flights with a buddy's FMS 70mm Scorpion. Tons of fun. I flew formation both loaded up and clean. No trim required either way. Guess I am getting used to the A-4 finally.
Got home, opened up the engine compartment to find the fan full of gunk from the grass field. Amazing how much stuff gets sucked through that fan. I also repaired an aileron hinge which had kind of worked loose at some point. I used the Freewing glue from the kit to fix the aileron hinge. It worked great. Otherwise not much maintenance required on this bird. She still looks like new.
before cleaning
after cleaning
Meridian Aeromodelers, Meridian MS
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