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C-ARF Ultra Flash build Thread + Video

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C-ARF Ultra Flash build Thread + Video

Old 12-14-2020, 07:28 PM
  #6751  
skunkwurk
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Nice flight! I usually slow my steering servo down, kind of like a flap servo. Makes keeping it straight much easier.
Old 12-15-2020, 04:38 AM
  #6752  
gawlevi
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Originally Posted by peter 098 View Post
Iím using a spectrum ix12.
With the spektrum radio you can set up a programmed curve. This curve is still fully proportional. How it works- once set up and as you move the stick from center to the left or right out to 75%, the servo will only move 10% giving you fine control while moving on the runway. Beyond 75% stick throw, the servo moves much further to give maximum throw for turn around. This set up also does not have any effect on rudder throw and gives much better control than expo. There is also no need to move any switches to activate the function.
This is how I set up all my jets as well as every jet I set up for others.
If you or anyone else is interested in this set-up, send me a PM and we'll do a video call and set you up. If there's a lot of interest, I'll put together a video on how to do it.
Old 04-20-2021, 06:58 PM
  #6753  
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Cheers!
Desert Fox 1
Old 04-26-2021, 08:13 AM
  #6754  
cmjets
 
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Hello, full set tanks for UltraFlash, Wing tank, saddle tanks and main kero tank in 3 sizes, 2L, 3L and 4L. Only in CMJETS Tanks.





https://cmjets.com/28-craf

BR from Spain.
Carlos
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Old 04-26-2021, 09:30 PM
  #6755  
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Originally Posted by Dave Wilshere View Post

Decided it was time to get my JetCat serviced after 34hours perfect operation. Also added a new pump ( actually the second one in its life) so everything starts fresh. Check start and run was perfect and I could clear some leaves from outside the office 😁
Seeing your duct there Dave, is there any difference in flight characteristics with or without the full ducting?
I am also wondering whether thereís enough bypass air through the duct to cool the exhaust air in the thrust tube. The black part around the turbine looks a bit tight but though.

Old 04-27-2021, 07:54 AM
  #6756  
Dave Wilshere
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I’ve not had the chance to fly back to back with a ducted one, but it flies just the same!
Old 04-28-2021, 03:58 PM
  #6757  
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Should be quieter.
Old 04-28-2021, 07:08 PM
  #6758  
Dave Wilshere
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Actually the un ducted one is quieter going fast as there is non of the usual UF duct ‘boom’ resonance. Medium speeds no difference to the ear.
Old 05-02-2021, 10:37 AM
  #6759  
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I'm thinking about putting together a UF evo.
Leaning towards an EvoJet B170neo turbine set at 160N, as I usually fly off grass and I would like "spirited" performance.

Are you saying that the pronounced intake noise I'm hearing in most video's on the internet, is actually caused by fully ducting the engine?
Do you "need" the ducting? As in, is it merely for more speed, or are there other issues to keep in mind when really pushing the airframe (+250mph)?
Could you build up too much pressure in the fuselage without the duct, at really high speeds?

Thanks.
Old 05-02-2021, 11:23 AM
  #6760  
Dave Wilshere
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The JetCat P-130Rx we use is actually a 154N turbine as tested by RCJi and way lighter than all 112mm turbines. Yes, the ‘boom’ is the ducting, so the Evo is quieter, no problem with speed, I’m not full beans for 2 full circuits of the airfield yet ( needed for maximum speed) but it’s going to be in the 250+ class.
Grass makes little difference, we have two P-90Rxi (105N) UF in our grass club and both come out of a 120m strip with crop on 4 sides with ease.

Full ducting is better for protection, objects and fires. In the case of the UF the inlets are small so drag from removing the full duct is not so evident
Old 05-02-2021, 01:59 PM
  #6761  
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I really would like to see a video of someone just gunning it...
Old 05-02-2021, 04:59 PM
  #6762  
camss69
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Saw a couple this weekend just ripping with 140ís in them. They were not EVOís though.. looked like an absolute blast!
Old 05-02-2021, 10:05 PM
  #6763  
Dave Wilshere
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Soon as we get the chance will video mine.
Old 05-03-2021, 09:34 AM
  #6764  
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Thx for the input Dave.
The P130-rx now definitely looks like an option, if it really puts out +150N. I fly at about 300ft above sea level, so it should be close.
I read here on RCU not only thrust is way higher than rated, but also fuel burn.
So how much fuel does it really burn? Do you fly on just the main tank for fuel?

Light is good...I love a light plane. Light engine, no smoke system, no Powerbox or the likes, single rx battery (if it doesn't need nose weight).

The Evojet 170 neo has the option to turn it up to 180N...which is tempting of course. But fuel burn will probably force you in the direction of auxiliary tanks.
Old 05-03-2021, 11:02 AM
  #6765  
Dave Wilshere
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You can read the report in RCJi on the performance. Yes fuel burn is really good too. I use just the std Evo tank (about 3.2 litres) and get 8 plus minutes mixed flying.
I have a Powerbox Mercury in my Evo full cockpit and it’s still only just over 10kg.

Dave
Old 05-05-2021, 02:24 PM
  #6766  
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This guy
That's the performance I'm looking for...my kind of flying too 😋


Last edited by Rudeboy; 05-05-2021 at 02:43 PM.
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