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C-ARF Ultra Flash build Thread + Video

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C-ARF Ultra Flash build Thread + Video

Old 08-08-2014, 05:35 PM
  #4326  
husafreak
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And Dave, if that photo was taken in your shop I want to hang out there!
Old 08-08-2014, 05:43 PM
  #4327  
husafreak
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Re: battery retention. Kinda depends on how you fly doesn't it? I know I can't resist snap rolls. I am kind to my jets so I usually slow in an upline and ease off the snap to slow it down after initiation, or I like to do a snap from the vertical into a little tumble at the top. All my jets and my Electra snap pretty violently! So for this reason I have my batteries velcroed so they won't slide and secured with straps or zip ties so they can't go anywhere. If it wasn't for those high G snaps I think Velcro alone would be sufficient. But just imagine how heavy your batteries are with a 10 G load. As a safety factor for those "whoops!" moments that may be a reasonable assumption.

Last edited by husafreak; 08-08-2014 at 05:48 PM.
Old 08-08-2014, 05:58 PM
  #4328  
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Flash maiden went great
Old 08-09-2014, 12:42 AM
  #4329  
Dave Wilshere
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Originally Posted by husafreak
And Dave, if that photo was taken in your shop I want to hang out there!
Yes, a, big toy shop! That's only 1/3 of it.
You are spot on with crow. The guys who I have set it for on their UF (mind games!) I use 3mm, anymore than 8mm it just makes the wing less efficient

Dave
Old 08-09-2014, 10:12 AM
  #4330  
mitchilito
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Originally Posted by husafreak
Gotta admit I haven't used Crow yet in my jets. But in my gliders (slope racing and hotliners) it is the only way to get them down! One thing I know is I do not like the way my gliders handle with a lot of up aileron crow, it is for landing, I need the drag, period. In the jet community I see Crow is very popular but I am surprised by the great difference in the amounts used by different modelers. For some 5mm of Crow is about it, to me that sounds reasonable, the crow will modify the airfoil camber, act as washout, and force the outer wing to stall last, allowing the pilot positive aileron control at a slightly higher angle of attack to touchdown. Large amounts of Crow would appear to me to act more like spoilers. Like in my gliders. Now you are really killing the lift on the outboard wing and will be reducing aileron effectiveness. This is opposite of washout. So I do not know where the line is and probably won't do the testing to find out. But if I were to use some crow it would be to enhance aileron effectiveness and overall wing airfoil "forgiveness" and not purely for gobs of drag, I would use a small amount of crow, not "spoilers".
I use less than 5mm of crow, probably around 3 to 4mm, and it transforms the tip stall tendencies of my UF. Doesn't take much AT ALL to make a big difference.
Old 08-12-2014, 08:14 PM
  #4331  
Gary Arthur
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Out of curiosity, how many Ultra Flash owners are using a Futaba 18mz? How do you set up your jets? Do you use flight conditions, offset mixes or both? I am primarily interested in how you mix your elevator with your flap.
Old 08-12-2014, 10:18 PM
  #4332  
andretorres89
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Originally Posted by Dave Wilshere
Yes, a, big toy shop! That's only 1/3 of it.
You are spot on with crow. The guys who I have set it for on their UF (mind games!) I use 3mm, anymore than 8mm it just makes the wing less efficient

Dave

Dave,

With 3mm crow on your ultra flash, what is your flap throw with that? - I just want to make sure I set mine up the way yours is.

Thanks,
Andre
Old 08-12-2014, 10:47 PM
  #4333  
Dave Wilshere
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Originally Posted by andretorres89
Dave,

With 3mm crow on your ultra flash, what is your flap throw with that? - I just want to make sure I set mine up the way yours is.

Thanks,
Andre
I still don't use CROW with the UF, but customer models I have set up with the 3mm, I set around 90mm flap, same elevator compensation

Dave
Old 08-13-2014, 12:30 AM
  #4334  
Dave Wilshere
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Another UF arrived yesterday for an M&R build. P-90Rxi in this one, JR servos but "darkside" radio
Scheduled the test flight for CJ in September
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Old 08-13-2014, 02:55 AM
  #4335  
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UF heading for the moon last weekend

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Old 08-13-2014, 04:58 AM
  #4336  
afterburner
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Originally Posted by Gary Arthur
Out of curiosity, how many Ultra Flash owners are using a Futaba 18mz? How do you set up your jets? Do you use flight conditions, offset mixes or both? I am primarily interested in how you mix your elevator with your flap.
I use both on my 18. Once I started using conditions I wondered why I waited so long. Just makes it so much easier to trim for each phase of flight. So I think for my UF, I set whatever the recommended flap/elevator mix was suggested but used conditions with trims set to separate.
Old 08-13-2014, 05:22 AM
  #4337  
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Originally Posted by Gary Arthur
Out of curiosity, how many Ultra Flash owners are using a Futaba 18mz? How do you set up your jets? Do you use flight conditions, offset mixes or both? I am primarily interested in how you mix your elevator with your flap.
I have swapped from JR to Futaba on some of my models and found that the way to go is to use conditions, and use the air brake menu to set flap and elevator positions for each condition (i.e., cruise, flap one and landing flap)....dead easy. No other mixes necessary. That was analogous to the flap system menu on my JR 12x.

Hope that helps Gary.
Old 08-13-2014, 05:26 AM
  #4338  
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[QUOTE=paulhat;11859600]UF heading for the moon last weekend

QUOTE]

Looks good Paul...Alex does take a good photo.
Old 08-13-2014, 05:44 AM
  #4339  
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He sure does.
Had a go with his camera and failed miserably
Old 08-13-2014, 07:35 AM
  #4340  
Gary Arthur
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Marty and Craig, thank you for your input.

I had had been using offset mixes and until the UF, they worked well. I saw some funny things going on when I used an offset for elevator when flaps were down.

I will ill give conditions a go.
Old 08-13-2014, 10:10 AM
  #4341  
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Originally Posted by Dave Wilshere
I still don't use CROW with the UF, but customer models I have set up with the 3mm, I set around 90mm flap, same elevator compensation

Dave
thanks Dave.
Old 08-13-2014, 04:24 PM
  #4342  
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I fly Jr but my UF is set up with Flight Modes (3) normal, mid flaps, landing flaps..Each is independently trimmed ailerons, elevator, rudder ( if needed ) Futaba would be conditions.
I set up all my models this way. Works well.

James
Old 08-14-2014, 09:50 AM
  #4343  
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Originally Posted by Gary Arthur
Out of curiosity, how many Ultra Flash owners are using a Futaba 18mz? How do you set up your jets? Do you use flight conditions, offset mixes or both? I am primarily interested in how you mix your elevator with your flap.
+1 on conditions. I use "clean", "flaps1", "flaps full", & trim her out in every condition in one flight. I think by setting it up with "powered glider" mode it allowed me to utilize the built-in butterfly (crow) function of the 18mz. As others have said, just be prepared for massive amounts of down elevator trim (with flaps-full/crow) when u hit that switch
Enjoy, Jay
Old 08-14-2014, 10:09 AM
  #4344  
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Originally Posted by BlueBus320
+1 on conditions. I use "clean", "flaps1", "flaps full", & trim her out in every condition in one flight. I think by setting it up with "powered glider" mode it allowed me to utilize the built-in butterfly (crow) function of the 18mz. As others have said, just be prepared for massive amounts of down elevator trim (with flaps-full/crow) when u hit that switch
Enjoy, Jay

Interesting. This is where I was having an issue with the amount of down elevator trim. By using an offset mix to the amount needed, it would also cut my elevator throw by a significant amount. This would happen just by turning on the offset mix. The throw was not nearing the ATV limit but for some strange reason, the throw was cut by more than half. The AFR remained unchanged. Made for an interesting few flights. As soon as the flaps and elev mix went on, the elevator felt lathargic.
Old 08-14-2014, 11:26 AM
  #4345  
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Don't use the powered glider mode on Futaba radios for a powered airframe use the Airbrake function, it has all the mix's built in.

Mike
Old 08-16-2014, 04:27 AM
  #4346  
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Originally Posted by BaldEagel
Don't use the powered glider mode on Futaba radios for a powered airframe use the Airbrake function, it has all the mix's built in.

Mike
+1...Mike is right on the money. Gary, it will take you all of about 3 minutes to set up what you are after without affecting you elevator sensitivity in this menu. The best way to go by far. When you go to test fly it you can adjust your trims in each flight mode if you have separated your trims in flight conditions. When you land after a test flight, make some measurements in each flight mode on the model, zero your trims and replicate the final desired trim positions by making further adjustments in the airbrake menu.
Old 08-17-2014, 10:51 AM
  #4347  
Dave Wilshere
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Spent a few hours in work today multitasking between washing wife's car! an Xcalibur I'm building for a customer and the Navy UF shown earlier, which is being build by one of the team, but I elected to do some of the "tarty" stuff like the Nose door set up. I realised there are still people who make the nose door too narrow, so I thought i'd go through my process again. You can see how much wider the door actually ends up. I size the door first in width, then the opening and finally the door length.

Dw

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Old 08-18-2014, 05:05 PM
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Hi Dave.....is there any risk in having no nose door...besides the obvious lack of air brake it provides. ie air going into the cabin...
As the wheel well is exposed Im guessing not.

My door does not overlap and lines up with a half mil gap around it. Looks works nice but will see how it goes in the air...in a month or so.

Just got my engine back and now back in the build phase at last......

Does anyone know anyone who has the Comp Arf J10 on a build thread yet.. mine just arrived and Im waiting the manual etc...will be building once the UF is off my table...cheers
Old 08-18-2014, 10:21 PM
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Dave Wilshere
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On fully ducted installations there is little difference between door and no door, it's cleaner with the door and like you say quite a big airbrake affect.
There are only 2 or 3 J 10's in England and none of the guys I know do build threads.
As always with rcu, through out any questions and there will be someone with an answer

Dave
Old 08-18-2014, 11:36 PM
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Thanks Dave. Ill leave my door as is then...As for the J10...Im a few months off starting anyway...hopefully somebody will have been brave and started a thread by then.

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