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C-ARF Ultra Flash build Thread + Video

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C-ARF Ultra Flash build Thread + Video

Old 04-12-2014, 10:23 PM
  #4051  
husafreak
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Looks like the correct decision to me. You were already WFO at flying speed when it veered right. So with rudder authority and a little up elevator you got it corrected. I bet it would have gone quite a way down field and maybe into the dirt if you had aborted.
Old 04-12-2014, 10:57 PM
  #4052  
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Originally Posted by afterburner
Husa, It's always the little things that seem to take the longest time to correct and when they come back to back it just makes it harder to get motivated to finish it. At least that's the way it ends up for me. I remember the days of staying up on a Saturday night trying to finish up a .40 size ARF for a maiden the next day. Now unless it's for an upcoming jet rally I just say it can wait.

Here's the take off roll of the Flash. The landing looked pretty much the same but went further down the taxiway to the right due to no air left for brakes. Could have probably aborted the take off but we all know how those split second decisions go.

https://www.youtube.com/watch?v=as3CPYmfXKg
I've had a couple of take offs like that on my old Flash. Sucks if you're flying off a runway that is only 40' wide. . I installed a gyro for the nose wheel on my Ultra Flash. Works like a charm.
Old 04-13-2014, 04:38 AM
  #4053  
sailing1
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Your takeoff roll is actually not all that uncommon -- or at least I have seen that several times on some of the UF's. On mine I have a separate takeoff rate with the steering rate turned down very low. This rate comes on when I have the gear down and flaps deployed otherwise set to full rates for Taxi. Also, lots of people use a cheap gyro just on the steering channel and that really helps take the wandering out of the equation. I don't use one on my Flash but do have one on my Comp Arf Viper which has a huge tail fin and can wander on takeoff roll with big cross winds. Takes that problem completely out of the equation.
Old 04-13-2014, 08:53 AM
  #4054  
Dave Wilshere
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Originally Posted by afterburner
Husa, It's always the little things that seem to take the longest time to correct and when they come back to back it just makes it harder to get motivated to finish it. At least that's the way it ends up for me. I remember the days of staying up on a Saturday night trying to finish up a .40 size ARF for a maiden the next day. Now unless it's for an upcoming jet rally I just say it can wait.

Here's the take off roll of the Flash. The landing looked pretty much the same but went further down the taxiway to the right due to no air left for brakes. Could have probably aborted the take off but we all know how those split second decisions go.

https://www.youtube.com/watch?v=as3CPYmfXKg
Have you put a straight edge on the side of your wheels? I can honestly say there is not an UF flying in England with a nose/rudder gyro. The three i flew on Friday were all raw and track straight down the strip. The trailing nose leg has to run straight (especially if the steering wires are slightly loose as I prefer).

Dave Bugz had his new UF at our grass strip BBQ today and made two great flights, landing well within our small grass strip without even breaking into a sweat....one or two P-140RX passes got some attention from the assembled audience :-) Great flying.

Dw
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Old 04-13-2014, 09:56 AM
  #4055  
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Originally Posted by Dave Wilshere
Do you have the nose door with a band around the nose leg and push block? Can you photo the nose arrangement?

Dave
Hi Dave,

Sorry, not at home now so no picture available, but i did the door setup exact as per manual.
But cause the nose wheel not falling in to lock i removed the door, cause of the air resistance pushing against it.

Cheers,

Ed
Old 04-13-2014, 10:34 AM
  #4056  
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Here are some shots of progress on the electronics bay. Question - How much protection do you need for wiring laying in the bay? Just protect sharp edges? I am used to protecting wiring in heil's due to vibrations. Not sure how much is needed on Jets. Don't want to add any more weight than necessary.

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Old 04-13-2014, 11:20 AM
  #4057  
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Looks really clean Spike!

What i did is just before give the internal an paint spray, is sand away all the sharp edges and sticking out fiber pins etc.
No vibrations on a jet as far as i'm concerned.
Old 04-13-2014, 11:27 AM
  #4058  
Dave Wilshere
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As long as they are not floating around, its not like a heli with vibration
Shouldn't need nose weight with all that in there!
Old 04-13-2014, 12:08 PM
  #4059  
Dave Bugz
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Guys I set the aircraft as DW recommended, and truly this is an AWESOME jet. it is super smooth and just rocKs. At our club meet and BBQ with 70 odd people watching the pressure was definitely on. No giro, standard DW set up I just flew her and she performed fantastic. This was only my 2nd flight ( I did have a Classic flash) and gotta say this jet just goes where you point it. DW was taking a few pictures and I forgot and just wound it up and the turn of speed was superb. If you want a great flying jet then I think you couldn't go far wrong with an UF. Yes it is a jet and you have got to respect that, but I am still smiling 6 hrs later. Cheers all, cheers DW.
Dave Bugz.
Old 04-13-2014, 05:04 PM
  #4060  
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Originally Posted by Dave Wilshere
As long as they are not floating around, its not like a heli with vibration
Shouldn't need nose weight with all that in there!
All what? powerbox isn't that heavy...
Old 04-13-2014, 05:04 PM
  #4061  
afterburner
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I had checked the steering after the flight at the field yesterday and there's probably a bit too much throw and to make matters worse I just now checked my radio and I had zero expo on the steering. I like expo. Also noticed a little play in the strut so will have to pull that and check. Just got the plane back in the shop and looked for the brake leak first which took about five seconds as it was loud. Tire rubbing against the air line . Though I had enough clearance and had it secure. All in all I was pretty lucky to get away unscathed. I think sometimes taking a long time on a jet can be just as bad as pushing hard on one as taking long breaks between assembly sessions makes it easy to skip over steps you may have thought you already finished.
Old 04-13-2014, 10:32 PM
  #4062  
Dave Wilshere
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Originally Posted by spike5150
All what? powerbox isn't that heavy...
OK...wrong phrasing! Depending on turbine choice it should balance about right.

D
Old 04-16-2014, 08:05 PM
  #4063  
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Originally Posted by Dave Wilshere
OK...wrong phrasing! Depending on turbine choice it should balance about right.

D
has as a kingtech 140G. 2x 2s 2700 lipos for radio power and a 3s 3800 life turbine battery up front.
Old 04-16-2014, 10:35 PM
  #4064  
Dave Wilshere
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Is the 3800 in the nose, or side pocket? Might be verging on nose heavy. Depends on your models tail lay up and tail servos.

Dave
Old 04-17-2014, 04:50 AM
  #4065  
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This is where my SmokePump ended up.
I made it with the full duct but it indeed was an Mega pain "there where the sun never shines" but made it. Had to glass an other layer on my sadels any way cause of the leaks so they have an full extra layer all over
About to insert te engine permanent. Then the last bits and pieces, adjusting en programing and it should be ready

bluelevel,

Did you balance the plane with the tanks full?

Cheers,

Ed[/QUOTE]

Last edited by Bravo77; 04-17-2014 at 08:49 AM. Reason: got the answer
Old 04-17-2014, 08:37 AM
  #4066  
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Bravo 77

Euh, are you asking me something? Can't figure it out??
Old 04-17-2014, 10:36 AM
  #4067  
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Dave Wilshire:
Have you had experience with the Jet Cat smoke pump pro? Did you like it? Kind of spendy but I like the way it co-ordinates with the ECU
Thank You
Paul
Old 04-17-2014, 11:26 AM
  #4068  
Dave Wilshere
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Paul

Never used one personally, always use the Powerbox smoke pump which has been brilliant. Sold a few of the JetCat units early and Mk2 and never had any complaints. Linking to ECU is neat safety feature, but its a chunk heavier than the PB unit, so always gone that way and run the power from a Powerbox unit saving more weight!

Dave
Old 04-17-2014, 08:10 PM
  #4069  
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Originally Posted by Dave Wilshere
Is the 3800 in the nose, or side pocket? Might be verging on nose heavy. Depends on your models tail lay up and tail servos.

Dave
batts in side pockets. Rudder and elevator servos are JR8411's. Air tank will be in nose.
Old 04-17-2014, 11:09 PM
  #4070  
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I'm not sure how much of a tip this is as you may have already done it or it could be something that everyone already does, but if you cut a small piece of 3mm Airline put it into the M3 Grub Screw hole in the nose retract unit, as you tighten the screw it creates a dampening effect on the steering which can be enough to stop the wheel veering around when accelerating, aswell as gives enough resistance on the steering to hold it straight when retracting the gear.
Old 04-17-2014, 11:19 PM
  #4071  
husafreak
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Thanks, but D.W. beat you to us with that suggestion, long time ago tho...
Old 04-17-2014, 11:24 PM
  #4072  
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I would guess that most balance their planes gear down with fuel in the UAT and everything else empty. That is what I am doing tomorrow.
I have the Sullivan Skywriter smoke pump for mine. i just wish it wasn't so big.
Old 04-17-2014, 11:47 PM
  #4073  
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Originally Posted by spike5150
batts in side pockets. Rudder and elevator servos are JR8411's. Air tank will be in nose.
OK, should be pretty then :-)

Dave
Old 04-17-2014, 11:58 PM
  #4074  
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Balanced mine gear up (cause this is the way you fly, when going gear down it will become slightly more heavy on the nose witch is no problem) tanks full and empty and took the average of both. I'm using the saddles for fuel and wing for smoke.
Balanced her upside down, so canopy facing to ground.
Flying it came out nose heavy so tossed out the 100grams i had to put in the nose.
Now she's as neutral as neutral can be, tanks (including wing smoke) full and empty, normal flight as well inverted.
CG stay's the way it is, not an single click of trim needed, all surface in neutral stand
Got the PB smoke system and in combination with the PB smoke oil it really is amazing smoke, very nice

Really an great and forgiving flyer!!
Old 04-18-2014, 12:26 AM
  #4075  
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Ultra Fun,
Just home after a great day test flying my new Swiss Ultra Flash,
Wow, We'll done CARF, she is a keeper, Fast ,stable and rock steady in the air. Great combination with a 140 as well.

Regards

john

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