CARF Ultra Flash Evo build thread +
05-07-2023, 09:46 PM
#601
Thread Starter
05-07-2023, 09:51 PM
#602
Thread Starter
Ok so I did some preliminary CG today… and I’m nose heavy.. Receiver batts and ECU batt will have to go back by the tank which is ok, just a little surprised since I have the 170 in it I was expecting to be more tail heavy.
I was happy to see I”m at 23.2lbs dry it sounds like that’s a pretty good weight.
It’s really light on the nose when the CG is correct with “landing fuel”, I read I think Dave posted that somewhere, but it’s only like 1/2 pound on the nose? Does that sound right for anyone using the Xicoy CG scales? Like without fuel in it, it might actually sit back on the tail, I didn’t try that though. I have the 4 liter tank and put one liter in as landing fuel.
I was happy to see I”m at 23.2lbs dry it sounds like that’s a pretty good weight.
It’s really light on the nose when the CG is correct with “landing fuel”, I read I think Dave posted that somewhere, but it’s only like 1/2 pound on the nose? Does that sound right for anyone using the Xicoy CG scales? Like without fuel in it, it might actually sit back on the tail, I didn’t try that though. I have the 4 liter tank and put one liter in as landing fuel.
Are you doing a manual balance or ‘variable’ electronic one? Depending on the equipment installed and layout, but I would guess batteries just in front of tank (rear of cockpit) would be a “normal” installation
05-08-2023, 07:52 AM
#604
Thread Starter
They just are not accurate. String method is 100% and repeatable.
Anyway Electron gear does not trail as much as designed for JP gear, so nose wheel will be lighter. Looking at the equipment you have I guess batteries along side tank makes sense.
Dave
Anyway Electron gear does not trail as much as designed for JP gear, so nose wheel will be lighter. Looking at the equipment you have I guess batteries along side tank makes sense.
Dave
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camss69 (05-08-2023)
05-08-2023, 09:06 PM
#610
Thread Starter
Just lightly tape it across the wing surface on the balance point, put the wing on (just tighten enough to trap the string-cord) if you over tighten you will mark the wing surface, then lift….
Again 90% of jets the balance changes with fuel, so unless we all use measured volumes of fuel it’s a close point you are looking for.
Flying with your set up is the only way to perfect the balance required
D
Again 90% of jets the balance changes with fuel, so unless we all use measured volumes of fuel it’s a close point you are looking for.
Flying with your set up is the only way to perfect the balance required
D
05-08-2023, 09:36 PM
#611
Just lightly tape it across the wing surface on the balance point, put the wing on (just tighten enough to trap the string-cord) if you over tighten you will mark the wing surface, then lift….
Again 90% of jets the balance changes with fuel, so unless we all use measured volumes of fuel it’s a close point you are looking for.
Flying with your set up is the only way to perfect the balance required
D
Again 90% of jets the balance changes with fuel, so unless we all use measured volumes of fuel it’s a close point you are looking for.
Flying with your set up is the only way to perfect the balance required
D
05-09-2023, 09:15 AM
#615
Agreed, I have had very consistent and repeatable results with the Xicoy scales. I’ve also done it with individual scales and the calculator. I’ve balanced a LOT of my own and club members planes with the Xicoy scales. Your measurements need to be precise to get accurate results so I spend a lot of time measuring.
05-09-2023, 10:35 AM
#616
Thread Starter
End of the day different pilots want different things. Lots of people like nose heavy set ups (it is why the CARF Viper manual balance is way forward-the designer likes nose heavy feel). It’s best to fly and adjust to suit what you like in feel.
05-11-2023, 08:09 PM
#618
My Feedback: (11)
Well got a new radio so Im learning that before flying my flash.
Im reading, I had all my batteries up near the front gear, sounds like I need to move them rearward. I havent checked CG yet either but I think Ill mount my two RX batteries on the sides of the tank.
Im reading, I had all my batteries up near the front gear, sounds like I need to move them rearward. I havent checked CG yet either but I think Ill mount my two RX batteries on the sides of the tank.
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essyou35 (05-17-2023)
05-17-2023, 05:21 PM
#625
My Feedback: (11)
I did a quick maiden on my jet today, flew 3 minutes then landed. I flew a little over 1/2 throttle on my k130 and it moves along ok, looking forward to opening it up.
kinda odd, it felt nose heavy but the elevator is twitchy. I have it set to the correct throw and I only had about 35% exp, Ill add some more to 50%. Very odd for a jet, thats 3d plane level expo there!
However I wonder if my issue is because I am using 1.25" servo arms? They are the hangar 9 1.5" arms but I am on the 1.25" hole. Could that be why? Myabe move down to 1"?
I could only get 3.25" on the flaps so Ill have to mess with the linkage to get more, but it still slows down nice with crow in it. No take off flaps. Maybe Ill just keep it this way. I could come in no power.
kinda odd, it felt nose heavy but the elevator is twitchy. I have it set to the correct throw and I only had about 35% exp, Ill add some more to 50%. Very odd for a jet, thats 3d plane level expo there!
However I wonder if my issue is because I am using 1.25" servo arms? They are the hangar 9 1.5" arms but I am on the 1.25" hole. Could that be why? Myabe move down to 1"?
I could only get 3.25" on the flaps so Ill have to mess with the linkage to get more, but it still slows down nice with crow in it. No take off flaps. Maybe Ill just keep it this way. I could come in no power.
