C-ARF Ultra Flash build Thread + Video
06-13-2011, 05:00 AM
#776
RE: C-ARF Ultra Flash build Thread + Video
Dale I blacked out my canopy using black lexan paint used for RC car bodies. For best results Spray several light coats instead of one heavy one. Ron
06-13-2011, 05:56 AM
#777
Thread Starter
RE: C-ARF Ultra Flash build Thread + Video
ORIGINAL: ddlstang
Dave, what / how do you black out the canopy. Do you use a spry on tint ?
Thanks
Dave, what / how do you black out the canopy. Do you use a spry on tint ?
Thanks
That one is RC Car Colours smoke tint. I also use Pactra smoke.
06-13-2011, 06:42 AM
#779
Thread Starter
RE: C-ARF Ultra Flash build Thread + Video
Gus
Always!? Even landing in a gale you should use max drag. My flaps are on a three pos switch and that is landing setting. This day was rough air because of trees and 10' shear edge each end, but the UF allows walking pace passes all day
Dave
Always!? Even landing in a gale you should use max drag. My flaps are on a three pos switch and that is landing setting. This day was rough air because of trees and 10' shear edge each end, but the UF allows walking pace passes all day
Dave
06-13-2011, 11:23 AM
#780
RE: C-ARF Ultra Flash build Thread + Video
Hi Dave,
The covers look straight, but viewed from the front they are at a slight angle against the airflow, thats the only reason i can think of the mains not retracting consistently. I use the BVM high flow valve with dreamworks retracts and struts which i bought from you. No restrictors used in the system. On the ground the gear retracts consistently. Could it be any other reason you can think off.
Chattty.
The covers look straight, but viewed from the front they are at a slight angle against the airflow, thats the only reason i can think of the mains not retracting consistently. I use the BVM high flow valve with dreamworks retracts and struts which i bought from you. No restrictors used in the system. On the ground the gear retracts consistently. Could it be any other reason you can think off.
Chattty.
ORIGINAL: Dave Wilshere
Chatty
The CF covers should not affect the gear going away as the covers are straight. I have no bad tendancies with the nose door on my UF, as the landing shot shows in Aberdeen it floats in. All three UF models I have flown are the same. On the C-36 in both my CF and UF I only have 85psi.
Dw
Chatty
The CF covers should not affect the gear going away as the covers are straight. I have no bad tendancies with the nose door on my UF, as the landing shot shows in Aberdeen it floats in. All three UF models I have flown are the same. On the C-36 in both my CF and UF I only have 85psi.
Dw
06-13-2011, 01:07 PM
#781
Thread Starter
RE: C-ARF Ultra Flash build Thread + Video
Chatty
Guess its the angled out covers, are you quite late getting the gear away? The CF is going way faster than the UF at rotation. put a 6mm packer under the nose unit to get a slight angle of attack and you will rotate earlier and slower and that will help.
Only know Behotec gear in the Flash series, really, really fine gear!
Dave
Guess its the angled out covers, are you quite late getting the gear away? The CF is going way faster than the UF at rotation. put a 6mm packer under the nose unit to get a slight angle of attack and you will rotate earlier and slower and that will help.
Only know Behotec gear in the Flash series, really, really fine gear!
Dave
06-15-2011, 02:15 AM
#782
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RE: C-ARF Ultra Flash build Thread + Video
ORIGINAL: Dave Wilshere
Nope! the foam is already removed and the outer skin is the top! 8411 is as deep as will fit.
You can use 8611 in other places, but it was designed for 19mm servos. I use 8411 and 8321 servos and would always, always, always use Digitals on Flaps, it's probably the most important control for it (just ahead of the Rudder) You will get variable flap amounts with std analogue servos and their lack of holding power! The whole point in digitals is the holding power, so they have FLAP written all over it! My UF with Digitals on everything except nose steering and retract valve uses 110mAh per pack (two on a Sensor switch) for a 9 minute mixed flight like the early video on here.
Dave
ORIGINAL: mtnflyer14
The manual will tell you that the max thickness for the servos in the horizontal stab is 19mm. I think Dave Wilshere will tell you that you can take out a little of the 'foam' in the stab if needed, but I just went with the 8411s and had no problem. I think your other servos are fine. I used digitals in the flaps and they hum in the up position, okay at half and full flap.
Regards,
Gus
The manual will tell you that the max thickness for the servos in the horizontal stab is 19mm. I think Dave Wilshere will tell you that you can take out a little of the 'foam' in the stab if needed, but I just went with the 8411s and had no problem. I think your other servos are fine. I used digitals in the flaps and they hum in the up position, okay at half and full flap.
Regards,
Gus
You can use 8611 in other places, but it was designed for 19mm servos. I use 8411 and 8321 servos and would always, always, always use Digitals on Flaps, it's probably the most important control for it (just ahead of the Rudder) You will get variable flap amounts with std analogue servos and their lack of holding power! The whole point in digitals is the holding power, so they have FLAP written all over it! My UF with Digitals on everything except nose steering and retract valve uses 110mAh per pack (two on a Sensor switch) for a 9 minute mixed flight like the early video on here.
Dave
Thanks guys!
Colin
06-15-2011, 03:27 AM
#783
Thread Starter
RE: C-ARF Ultra Flash build Thread + Video
Colin
Depends on servo case length, you'll struggle I think. Anything over 39mm is really tight.
Dave
Depends on servo case length, you'll struggle I think. Anything over 39mm is really tight.
Dave
06-15-2011, 04:29 AM
#784
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RE: C-ARF Ultra Flash build Thread + Video
ORIGINAL: Dave Wilshere
Colin
Depends on servo case length, you'll struggle I think. Anything over 39mm is really tight.
Dave
Colin
Depends on servo case length, you'll struggle I think. Anything over 39mm is really tight.
Dave
I didn't realise length would be an issue too. It looks like the Futaba misses out by 1mm in thickness, and 1mm in length. Sounds pretty close, but often "close" doesn't cut it. I might wait until the kit turns up and test fit one to see.
I'd be very interested to hear though if anyone has already tried Futaba servos in the tail.
Cheers,
Colin
06-15-2011, 05:44 AM
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RE: C-ARF Ultra Flash build Thread + Video
I have Futuba 9156's in My Original Flash.
From what I remember I did not have to really do anything to get them in.
From what I remember I did not have to really do anything to get them in.
06-15-2011, 06:17 AM
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RE: C-ARF Ultra Flash build Thread + Video
My flash is done but I'm way tail heavy at 220mm. I got all my equipment where it is shown in the manual. Where are you guys flying, closer to 225mm?
Thanks
Albert
Thanks
Albert
06-15-2011, 09:01 AM
#787
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RE: C-ARF Ultra Flash build Thread + Video
My UF was initially very tail heavy, but discovered that I had some fuel in the fuselage tank. Took that out and balanced with UAT full, gear down, ECU and receiver batteries forward in the nose 'pockets' and the CG was fine. This is with a P-120.
Regards,
Gus
PS I should add that (although I can't remember the exact location - 220mm?), it balanced per the addendum Dave Wilshere wrote on the C-ARF UF site.
Regards,
Gus
PS I should add that (although I can't remember the exact location - 220mm?), it balanced per the addendum Dave Wilshere wrote on the C-ARF UF site.
06-15-2011, 09:31 AM
#788
Thread Starter
RE: C-ARF Ultra Flash build Thread + Video
The threaded rod should be approximately 50mm long and a good starting point for the push rod centres would be 75mm. This is centre of ball link to clevis pin.
The aileron pushrods need to be approximately 60mm long with 86mm centres. Both figures based on JR 8411 servos.
The flap settings for the Ultra Flash are:
Take off 25-28mm (1-1 1/8â€). Landing 95-100mm (3 ¾†to 4â€) both figures measured at the root, trailing edge of each flap.
The Ultra Flash requires down elevator with flap. Take off 1mm and Landing 4mm measured at the elevator trailing edge tip. Exact figures will be affected by balance position.
Balance point, gear up 220-225mm back from the wing/fuselage joint.
Dw
The aileron pushrods need to be approximately 60mm long with 86mm centres. Both figures based on JR 8411 servos.
The flap settings for the Ultra Flash are:
Take off 25-28mm (1-1 1/8â€). Landing 95-100mm (3 ¾†to 4â€) both figures measured at the root, trailing edge of each flap.
The Ultra Flash requires down elevator with flap. Take off 1mm and Landing 4mm measured at the elevator trailing edge tip. Exact figures will be affected by balance position.
Balance point, gear up 220-225mm back from the wing/fuselage joint.
Dw
06-15-2011, 10:05 AM
#789
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RE: C-ARF Ultra Flash build Thread + Video
I got my batt. packs as far up front as possible and my uat full. Oh well 1/4 pound of lead in the nose it is.
06-15-2011, 11:02 AM
#792
Thread Starter
RE: C-ARF Ultra Flash build Thread + Video
Normal!
Anyway, model will carry a ton of weight if needed. My model has around 3 oz of weight. Exact equipment weight, battery type and weight all affects things. My ECU pack is 5200 Mah...
regards
Dave
Anyway, model will carry a ton of weight if needed. My model has around 3 oz of weight. Exact equipment weight, battery type and weight all affects things. My ECU pack is 5200 Mah...
regards
Dave
06-15-2011, 11:12 AM
#793
Thread Starter
RE: C-ARF Ultra Flash build Thread + Video
Back on the P-80SE project after a couple of trips away. Wood work sealed with ZAP 40 and primed. (I'm also doing a set for a friend also building an UF. Fuselage insides painted light grey.
Dw
Dw
06-15-2011, 05:20 PM
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RE: C-ARF Ultra Flash build Thread + Video
ORIGINAL: ricardinho
Albert my man what's up..how's the bird comming..
Albert my man what's up..how's the bird comming..
Maiden at farview this saturday.
06-15-2011, 06:48 PM
#798
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RE: C-ARF Ultra Flash build Thread + Video
I misspoke, my UF was balanced gear up, UAT full. Again, it was tail heavy until I realized I had some fuel in the fuselage tank, took it out, then okay.
Regards,
Gus
Regards,
Gus