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C-ARF Flash Build Thread for All Flash's being built this winter

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Old 10-05-2010, 09:00 PM
  #751
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter


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ORIGINAL: sailing1

Another 4 perfect flights with my Jet Central Rabbit powered Flash yesterday. Finally made it out to the field with a good radar gun and took some speed pass readings. Was pleasantly surprized by the numbers the little 19 lb thurst over achiever put up. Strait and level passes were between 165-170 mph every time and we were clocking around 190 on diving passes with our best numbers being 193 MPH. I am now pretty sure we could see 199.99 with a decent tail wind.

I was thinking about putting my new Cheetah in the Flash but being able to fly 8-10 minutes on 75-80 ounces of fuel, decent speed and light landing weights have pretty much made me change my mind on that approach. Hmmm Guess I will be looking for a new airframe for the Cheetah!
Ultra!!..
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Old 10-06-2010, 06:59 AM
  #752
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter


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ORIGINAL: Eagle Driver

just finished this Flash for one of my customers and want to share some pics with you guys ....

powered by Booster 160 (IQ-Hammer)

How are you charging battery packs hooked up to DPSI TWIN Mini? Good looking set up. I like Emcotec items they seem to be high quality. How is DPSI TWIN Mini set up, RX switch?
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Old 10-06-2010, 09:27 AM
  #753
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter

I charge the batteries over the green MPX connectors on side of the twin mini. it`s a double
rx setup. always switched to the rx with the best signal.
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Old 10-06-2010, 11:45 AM
  #754
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter

Maidened my Flash today. First flight was a bit of a handful. I had 20mm of aileron with 20% expo & not enough expo on the elevator at 30%. It was very twitchy. I cut the aileron to 10mm & upped the aileron expo to 30% & 50% on the elevator. Much smoother to fly. This is really two jets. It is easy & docile to fly slowly, open the (throttle Merlin 140) & it requires a whole lot more attention.
At full throttle it climbs, so I will dial in some down elevator at full chat.
I have 6mm crow, but will increase this, as it tends to float on landing (flaps at 50mm).
Had eight flights & it is a nice relaxing jet to fly, or a tiger by the tail if you want it to be.
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Old 10-06-2010, 01:20 PM
  #755
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter


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ORIGINAL: Jascat100
it is a nice relaxing jet to fly, or a tiger by the tail if you want it to be.
Congratulations Jim, and you are so right about the "tiger"
I have a 160 in mine, and going full throttle is just pure fun
Good luck with the Flash!
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Old 10-06-2010, 05:05 PM
  #756
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter

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ORIGINAL: Carsten Groen


..............I have a 160 in mine, and going full throttle is just pure fun
so much fun in fact, i defiantly recommend you set your timer and USE it, you'd hate to know the number of times i had ran the tanks dry and flamed out with my Titan in the ON position.
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Old 10-06-2010, 07:04 PM
  #757
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter

Yea, but it solves that landing heavy problem!
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Old 10-06-2010, 07:19 PM
  #758
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter


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ORIGINAL: sailing1

Yea, but it solves that landing heavy problem!

landing heavy with a Flash isn't a problem, it lands just as sweet with the tanks full as it does with them empty, i've shot countless touch-n-go's from the beginning of the first lap till she ran dry, it's one of a few jets that IMHO flies better with a little weight.
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Old 10-06-2010, 08:39 PM
  #759
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter


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ORIGINAL: KC36330


Quote:
ORIGINAL: sailing1

Yea, but it solves that landing heavy problem!

landing heavy with a Flash isn't a problem, it lands just as sweet with the tanks full as it does with them empty, i've shot countless touch-n-go's from the beginning of the first lap till she ran dry, it's one of a few jets that IMHO flies better with a little weight.
Put another 4 flights on today with 30 lbs thrust. Sure is fast...... What a great flying jet...
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Old 10-06-2010, 11:09 PM
  #760
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter


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ORIGINAL: KC36330


Quote:
ORIGINAL: sailing1

Yea, but it solves that landing heavy problem!

landing heavy with a Flash isn't a problem, it lands just as sweet with the tanks full as it does with them empty, i've shot countless touch-n-go's from the beginning of the first lap till she ran dry, it's one of a few jets that IMHO flies better with a little weight.
Agree KC, I can't feel much of a difference if I land after 1 minute of fun, or when the tanks are almost empty!
And believe me, the timer is set
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Old 10-11-2010, 06:33 AM
  #761
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter

344 km/h (213 mph) this weekend with Wren 160 @ 123 000 rpm. Will need to crank that sucker up to 126 000 rpm and try again
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Old 10-13-2010, 06:11 PM
  #762
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter

was curious to see how the p80se flys the flash. i am on getting ready to purchase the ultra flash. how do you like it.. thanks pat
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Old 10-19-2010, 08:46 PM
  #763
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter

Hi Guys,

I ran my P120 today at the field for the first time in the flash. I had put aluminum tape on the stab in the fuse to protect it from the heat. I did notice that the back of the fuse along side the vertical fin got warm. left side a bit warmer then the right side.

I am wondering what is an acceptable heat to the touch in that area. I ran for 2-3 minutes. I did not maiden it as a pretty heavy cross wind developed before I had a chance to get all the checks finished.

Thanks,
Stan
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Old 10-19-2010, 08:50 PM
  #764
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter

if you can hold your hand on it, it's fine. about 150ΒΊ F the epoxy/glass starts to soften.
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Old 10-19-2010, 09:55 PM
  #765
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter


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ORIGINAL: tucson

Hi Guys,

I ran my P120 today at the field for the first time in the flash. I had put aluminum tape on the stab in the fuse to protect it from the heat. I did notice that the back of the fuse along side the vertical fin got warm. left side a bit warmer then the right side.

I am wondering what is an acceptable heat to the touch in that area. I ran for 2-3 minutes. I did not maiden it as a pretty heavy cross wind developed before I had a chance to get all the checks finished.

Thanks,
Stan
Did you cut out the duct holes in the bottom, it helps keep things cool...
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Old 10-19-2010, 10:01 PM
  #766
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter

Maybe the fact that I ran it for 3 or more minutes on the ground caused it to get a pretty warm to the touch.

I wonder what most guys are doing to keep the heat down?

KC you are running a 160, is this a problem for you?

Stan
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Old 10-19-2010, 10:08 PM
  #767
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter


[/quote]
Did you cut out the duct holes in the bottom, it helps keep things cool..
[/quote]

Yes I did.Just trying to find out what would be considered normal heat in that area.

Stan
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Old 10-19-2010, 10:44 PM
  #768
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter

Titan SE and never noticed it even warm but only time it was running and not moving for an extended period was during the initial power on ground run and i don't remember it getting hot then.

were you able to keep your hand on it or was it too hot to keep it there?
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Old 10-19-2010, 11:05 PM
  #769
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter


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ORIGINAL: KC36330

Titan SE and never noticed it even warm but only time it was running and not moving for an extended period was during the initial power on ground run and i don't remember it getting hot then.

were you able to keep your hand on it or was it too hot to keep it there?
one side was just warm. the other I could keep my hand on it but it was approaching getting hot.

This was as I mentioned after a 3 minute run on the ground.

Could it be that the engine nozzel was not centered?
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Old 10-19-2010, 11:35 PM
  #770
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter

mine gets a little warm after sitting idle for a few minutes. seems cooler right after landing, so I am assuming its just some radiant heat while not moving.

Kevin
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Old 10-20-2010, 01:00 AM
  #771
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter


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ORIGINAL: seflyer

mine gets a little warm after sitting idle for a few minutes. seems cooler right after landing, so I am assuming its just some radiant heat while not moving.

Kevin
Makes sense.I need to check after landing.

Stan
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Old 10-20-2010, 02:06 AM
  #772
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter

Stan

What gap do you have between the inner tail pipe tube and the outer aluminium "cool wall" tube at the rear?

Dave
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Old 10-20-2010, 07:05 AM
  #773
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter

I'm with Dave, check the pipe gap at the rear and make sure you've got enough gap to allow cooling air to be drawn down between the pipes and that the inner pipe is about 10mm inside the outer, after 3 min sitting she shouldn't be hot. as far as centered in the pipe, you should be able to look up the tail and see if the turbine is centered.
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Old 10-20-2010, 10:46 AM
  #774
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter

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ORIGINAL: Dave Wilshere

Stan

What gap do you have between the inner tail pipe tube and the outer aluminium ''cool wall'' tube at the rear?

Dave
Dave and KC

The distance from where the inner pipe ends to where the outer pipe ends at the rear of the fuse is approx 7 mm.

The gap between the two pipes at the rear varies between 5-6 mm. I don't see how you can get any more as the outer pipe is up against the outer fiberglass.

The motor looks centered as best I can tell looking down the tube.

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Old 10-20-2010, 03:20 PM
  #775
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Default RE: C-ARF Flash Build Thread for All Flash's being built this winter

everything looks fine in the picture to me ............. i don't know that it makes a hill of beans difference one way or the other but i always put the seam to the bottom on my installs.
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