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CARF Ultra Flash Evo build thread +

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CARF Ultra Flash Evo build thread +

Old 06-24-2022, 05:24 AM
  #351  
camss69
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In the past with electron gear Iíve Hysolíd nuts to the gear legs and then screwed the doors on. It works really well and I havenít had any issues. Iíll try to find pics..
Old 06-24-2022, 06:52 AM
  #352  
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I would prefer to have the gear doors bolt to the legs. However, when the legs are aligned so that the wheels point the correct direction, the wing surface and face of the legs is not parallel. My wooden blocks have an angled cut so that the doors are flush with the wing.
I did get a perfect fit. Although the doors are solidly attached, the whole thing seems perilous.
Old 06-24-2022, 07:03 AM
  #353  
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Thanks both. I'm going to see if I can 3d print or CNC some mount that considers that angle. Interesting little challenge.
Old 06-24-2022, 08:01 AM
  #354  
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There were slight differences between left and right sides.
I thought about 3D printing. But the blocks took less time to make than I would spent on measuring and drafting and printing. The whole thing took an hour.
Old 06-24-2022, 09:06 AM
  #355  
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Hereís the pics of one of my other planes..

I wanted them to be easily removable in case I needed to service the gear.




Old 06-27-2022, 11:21 AM
  #356  
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The electron gear is in. Had to sand rails a bit for the nose to make it fit. For the main I ended up 3d printing a part to support the gear doors and also act as clip for the brake wire. The part is held by one M4 bolt that replaces the screw that holds the spring. Happy to share the STL if anyone wants it.





Old 06-30-2022, 07:49 AM
  #357  
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Hullo,
It is clear the Ultra Flash needs significant weight in the nose. I would like to place the batteries in front of the nose gear, but that area is nearly in accessible. It would be a pain to remove the batteries for charging.
I could charge the batteries in the airplane, but this seems risky.
How are others installing batteries?

Thank you
Old 06-30-2022, 12:26 PM
  #358  
Dave Wilshere
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All my batteries are in the cockpit area. 2x2500 Powerbox Powerpak and one time 3700 2s ECU
Old 07-01-2022, 10:57 AM
  #359  
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What would that be a good product to replace the 3mm rod in the CARF kits?
Old 07-01-2022, 11:20 AM
  #360  
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Hi,
I used these rods:

https://www.espritmodel.com/pushrod-...raft-m3-2.aspx

You can see some in the photos I posted recently.
Old 07-01-2022, 11:21 AM
  #361  
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Originally Posted by jvaliensi View Post
Hi,
I used these rods:

https://www.espritmodel.com/pushrod-...raft-m3-2.aspx

You can see some in the photos I posted recently.
Thanks--I have used the steel ones of that brand recently, but need something longer than they make.
Old 07-01-2022, 11:28 AM
  #362  
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Wow. The longest one in my UF was for the rudder and they made that size.
You can buy 3mm threaded rod in 12" or longer lengths.
Old 07-01-2022, 11:48 AM
  #363  
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thanks--my LHS tops out at 2mm so I will look around. Yeah this is for another CARF jet...... I have a UF Evo but it's built and flying.
Old 07-01-2022, 12:48 PM
  #364  
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Originally Posted by AEROSHELDON View Post
thanks--my LHS tops out at 2mm so I will look around. Yeah this is for another CARF jet...... I have a UF Evo but it's built and flying.
ĎFor longer one I would suggest 3mm full tread rod, with a glued carbon Fiber tube on topÖ..I have done that before..
Old 07-01-2022, 06:53 PM
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Originally Posted by Dansy View Post
ĎFor longer one I would suggest 3mm full tread rod, with a glued carbon Fiber tube on topÖ..I have done that before..
Yeah, I will probably just get some steel rod at amazon.... thanks!
Old 07-26-2022, 09:26 AM
  #366  
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Originally Posted by LA jetguy View Post
After having several Ultra FlashesÖ. Today I placed my order for the evo version (Art Scholl) Scheme. Decided to use electron retracts and will power the jet with either JM122NG or X120. Will use MKS servos, Cortex Pro (of course), REX12 with REX3 clone and MAP 4oz UATÖ

David
Hi David, Iím about to maiden my UF Evo and was wondering what % gain should I set the Cortex at as a safe starting point.
my throws are very conservative.

Roccp

Old 07-26-2022, 09:32 AM
  #367  
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Originally Posted by traxxis1 View Post
Hi David, Iím about to maiden my UF Evo and was wondering what % gain should I set the Cortex at as a safe starting point.
my throws are very conservative.

Roccp
I use flight modes.. so for "Cruise mode" (normal flight) I have it set at 35%, for Take off Mode I have it set at 60% and for landing it have set at 75% (we get lots of cross winds). for landing you can dial down to 70% if your usual wind is down the runway.

I'm using Jeti system so my gyro gain is constantly adjusted based on speed (its speed through pitot tube) by15%.. the faster I fly the lower the gain (20%).. the slower I fly the higher the gain (50%).. the take off and landing gains are constant...

David
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Old 07-26-2022, 12:00 PM
  #368  
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David I have one more question. The evo came out to 23lbs with batteries and full UAT. Do you think it will fly well with a king tech K100 G2 which has 22lbs of thrust. Planning on putting a bigger engine down the line if it works out.

thank you for your help.
Old 07-26-2022, 12:02 PM
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Originally Posted by traxxis1 View Post
David I have one more question. The evo came out to 23lbs with batteries and full UAT. Do you think it will fly well with a king tech K100 G2 which has 22lbs of thrust. Planning on putting a bigger engine down the line if it works out.

thank you for your help.
Yes it will be fine .. may need a bit more runway (hopefully not grass) and you donít need as much flap 80mm should be fine. No crow

itís a great jet
Old 07-26-2022, 12:08 PM
  #370  
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With 80mm flaps and no crow will it glide in or will I need some power until mains are down?
Sorry for all the questions but your input is very helpful.
Thanks again
Old 07-26-2022, 01:08 PM
  #371  
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P-100 and Ultra Flash comes in and out of a 360’ grass strip (not much altitude)with no issue. Since some of the 100N turbines have as much idle thrust as other 140N turbines, I would never reduce the flap, you can keep power on, but you cannot increase drag above the maximum set….
Old 07-26-2022, 01:21 PM
  #372  
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Hi Dave,
Makes a lot of sense. I have it setup with 85mm flaps, 5mm crow, 5mm down elevator and CG @ 230 Should I live it as is?

Rocco
Old 07-26-2022, 08:49 PM
  #373  
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I’ve never used Crow on a UF, but I know some guys like to. Personally I would add more Flap even with the Crow, 95mm. I use approx 105mm no Crow.
Also don’t rely on just measuring each Flap travel, they rarely match like that. Stand at the nose and look down on the top surface of the two flaps. You should be able to sight an exact match slowly leaning forward and back to ensure you are seeing the same surface angle on each

Dave
Old 07-27-2022, 02:25 AM
  #374  
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I will use that method to check them.

Do you think crow helps prevent tip stall or tip stall is not soothing to worry about too much with the UF?

Rocco
Old 07-27-2022, 06:38 AM
  #375  
Dave Wilshere
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Won’t stop it on an UF, the curved tips do that. It just changes the AOA and dumps lift.
I can land at walking pace with a std set up.

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