New Composite ARF SU27
08-30-2017, 12:53 PM
#301
Great pictures and very helpful, thanks! Wish I could find other similar equipment installation pics to get even more ideas.
I kind of figured I didn't want to create a situation where the cockpit needs to come out between every flight, thank you for confirming that.
I did consider adding the valves under the speed brake to keep them mid-ship, may take another look at that this evening. I would like to add the scale(ish) speed board cover plate that CARF provides, but if I use a bit of velcro to keep it in place maybe it could be easily removed to open/close the fuel valves.
I kind of figured I didn't want to create a situation where the cockpit needs to come out between every flight, thank you for confirming that.
I did consider adding the valves under the speed brake to keep them mid-ship, may take another look at that this evening. I would like to add the scale(ish) speed board cover plate that CARF provides, but if I use a bit of velcro to keep it in place maybe it could be easily removed to open/close the fuel valves.
08-30-2017, 01:01 PM
#302
Great pictures and very helpful, thanks! Wish I could find other similar equipment installation pics to get even more ideas.
I kind of figured I didn't want to create a situation where the cockpit needs to come out between every flight, thank you for confirming that.
I did consider adding the valves under the speed brake to keep them mid-ship, may take another look at that this evening. I would like to add the scale(ish) speed board cover plate that CARF provides, but if I use a bit of velcro to keep it in place maybe it could be easily removed to open/close the fuel valves.
I kind of figured I didn't want to create a situation where the cockpit needs to come out between every flight, thank you for confirming that.
I did consider adding the valves under the speed brake to keep them mid-ship, may take another look at that this evening. I would like to add the scale(ish) speed board cover plate that CARF provides, but if I use a bit of velcro to keep it in place maybe it could be easily removed to open/close the fuel valves.
08-30-2017, 02:33 PM
#304
Guys who are flying this model already, do you have your service items (switches, air fill, fuel fill, fuel shutoff valves) all accessible through the nosecone or do you raise the canopy and remove parts of the cockpit between flights? With no hatches around center ship, been trying to figure out how to lay those items out without creating unnecessarily long runs for everything but there may not be any way to avoid it. As of now I'm looking at having probably 12 or more feet of fuel line per turbine when you consider going from fill port in the nose to UAT near nose gear, then back up front to a shut off valve in the nose before going back to the pump and then turbines.
I have not yet started on the cockpit - once assembled can it be easily removed to access fuel shutoff valves and such if I were to install them around the nose gear mount instead of at the nose cone?
I have not yet started on the cockpit - once assembled can it be easily removed to access fuel shutoff valves and such if I were to install them around the nose gear mount instead of at the nose cone?
most guys are going through the air brake door....
09-06-2017, 09:48 AM
#305
Anyone have suggested throws for the leading edge flaps/slats? The manual gives starting throws for all other surfaces except those. Thinking maybe 1/4" with takeoff flap, 1/2" with landing flap (measuring the opening at the wing seam, not the deflection of the leading edge) but that is just a wild guess.
09-06-2017, 02:32 PM
#306
Anyone have suggested throws for the leading edge flaps/slats? The manual gives starting throws for all other surfaces except those. Thinking maybe 1/4" with takeoff flap, 1/2" with landing flap (measuring the opening at the wing seam, not the deflection of the leading edge) but that is just a wild guess.
When I spoke to Andres, he stated that the aircraft is very stable, so full deflection on both slats/flaps on landing and half on take off....
09-07-2017, 07:14 AM
#307
As luck would have it, I mocked up the wing against the fuse and deflected the slat until it stopped against the slot in the fuselage and the deflection was about exactly 1/2" at the root of the slat. So my 1/2" and 1/4" guesses might be pretty close after all. Thanks Mave.
09-07-2017, 08:13 AM
#308
Hi All
please be careful with statements like : Full Deflection or "as much as you can get". I lost a Skygate Hawk because what I could get in full Deflection of the flap was 3 times more than what another Hawk owner could get from his. The actual measurement as you are doing is the best way.
Behzad
please be careful with statements like : Full Deflection or "as much as you can get". I lost a Skygate Hawk because what I could get in full Deflection of the flap was 3 times more than what another Hawk owner could get from his. The actual measurement as you are doing is the best way.
Behzad
09-24-2017, 12:24 PM
#314
Join Date: Apr 2004
Location: BrisbaneQueensland, AUSTRALIA
Posts: 18
Likes: 0
Received 0 Likes
on
0 Posts
09-28-2017, 05:53 AM
#315
Are you guys gluing in the ventral fins or do they just stay with friction alone? I think permanently installing them would actually block the small hatch to the stab servo linkage, but wasn't sure if they would stay put if they were only pressed in so they could be easily removed for transport.
09-28-2017, 06:36 AM
#317
Nothing in the fuselage side and no mention of them in the manual - each fin just has two rods (fiberglass perhaps) that slide into carbon tubes in the bottom of the fuselage. They do feel pretty snug, but wouldn't want one to fall out across the field either. And they definitely interfere with storage/transport if you want to try to transport on a shelf with gear up.
09-28-2017, 08:47 AM
#318
09-28-2017, 09:13 AM
#319
Most of it was in the servo set up. But the slat did move smoothly with no grabbing. That's down to the sanding/cleaning to remove any rough spots. Then the four servos were matched in pairs and JR aluminium double arms used. This gets you nearest to a matched pair with no subtrim. I cut off the unused side. Then I clamped the two arms together and drilled the clevis holes in a pillar drill. I have a set of 0.1mm step drills and keep at least 10 of each between 1mm and 3mm as they are only good for a few jobs, before they are shot at that size.
The clevis pins were lightly greased to stop chattering which wears the holes and pins.
Then I set the movement with the inner servo only connected, then disconnected the inners and did the same on the outers and used the PB servo match to get it matched closed. Then I connected up the two servos with the H9 meter on the outer and used the Powerbox match to set the open position. The first wing too 4 hours, the second less that 2.
But the servos need to be mechanically matched as close as possible before you start!
Dave
The clevis pins were lightly greased to stop chattering which wears the holes and pins.
Then I set the movement with the inner servo only connected, then disconnected the inners and did the same on the outers and used the PB servo match to get it matched closed. Then I connected up the two servos with the H9 meter on the outer and used the Powerbox match to set the open position. The first wing too 4 hours, the second less that 2.
But the servos need to be mechanically matched as close as possible before you start!
Dave
09-28-2017, 10:49 AM
#320
Thanks Dave! I did get the servos mechanically matched up, and basically to a point where the amp load on each servo at rest does not increase when the other servo is connected or disconnected (seems to reason that helps me ensure they aren't fighting each other anyway). Little grease on the pins seems like a fine idea though, and will check for any rough spots on the slats or wing themselves. I didn't mean to indicate they are grabbing, but more so the friction of the upper slat skin as it slides against/underneath the wing skin. But I'll feel for anything there that might cause extra load.
09-28-2017, 03:29 PM
#321
Are you guys gluing in the ventral fins or do they just stay with friction alone? I think permanently installing them would actually block the small hatch to the stab servo linkage, but wasn't sure if they would stay put if they were only pressed in so they could be easily removed for transport.
Thomas
09-29-2017, 02:50 PM
#323
Also i had a partial Gear up landing,were the nose lg was the only one down, they saved me to scratch the fuselage, they are preatty strong and holded up really well with just some minor scratches, been flying with them afterwards and no issues whatsoever....
Last edited by skymaster68; 09-29-2017 at 03:01 PM.
10-01-2017, 12:48 AM
#324
gentleman just for info, it's been a while since i posted but i have to stress to keep checking the your slats before and after flights, another carf su-27 lost their slat in mid flight....hopefully the picture uploads...
in the picture, the left slat is missing completely..