Carf MIG-15
02-01-2015, 05:11 AM
#401
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Last edited by tow; 02-01-2015 at 05:13 AM.
02-01-2015, 05:25 AM
#402
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It`s important how you set up linkages and throws for the flaps. Ideally the servo-horn should be on line with the pusrod when fully deployed.
Hi,
Ive been installing the flap servos/linkages in the wings and I had a couple questions. Do the flaps droop down when the aircraft has no power to the servos? I had a hell of a time getting the control horn geometry correct so that it was not putting a huge load on the servo when extended. Im running 8411's and I decided to mount the servos in the wing vs. on the hatch cover. To me it is much easier to set the flaps up that way. Im running the shortest horns that I can get away with on the servo so I can get all the torque I can. They seem to be ok now but they dont stay in the up position without the power being on. In fact i think I saw almost a half an amp draw when in the up position on my Powerbox Royal. Just curious what others have found...
Thanks Guys!
-Carl
Ive been installing the flap servos/linkages in the wings and I had a couple questions. Do the flaps droop down when the aircraft has no power to the servos? I had a hell of a time getting the control horn geometry correct so that it was not putting a huge load on the servo when extended. Im running 8411's and I decided to mount the servos in the wing vs. on the hatch cover. To me it is much easier to set the flaps up that way. Im running the shortest horns that I can get away with on the servo so I can get all the torque I can. They seem to be ok now but they dont stay in the up position without the power being on. In fact i think I saw almost a half an amp draw when in the up position on my Powerbox Royal. Just curious what others have found...
Thanks Guys!
-Carl
03-16-2015, 01:43 AM
#408
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03-30-2015, 11:53 AM
#409
A short video of my 3 years old C-arf Mig/Jetcat P80se flying today in less than ideal light conditions.. filmed with my hatcam. The Mig was last flown 7 months ago, and the P80se fired up at first try (did not bother to prime). It felt like I flew this beauty yesterday, it handles so well!
http://www.youtube.com/watch?v=pC2Zd8S5shE
http://www.youtube.com/watch?v=pC2Zd8S5shE
05-22-2015, 01:54 AM
#410
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Are you balancing flat or slightly nose-heavy? When suspending from CG point there`s a noticable shift in CG with gear retracted as all wheels ends up front of CG. Does this matter?
05-22-2015, 07:20 AM
#412
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thnx :-)............ Now, just to clarify, manual says CG 5cm ahead of rear spar, do you measure from center or edge of spar?
Last edited by tow; 05-22-2015 at 07:36 AM.
05-25-2015, 05:41 AM
#415
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05-25-2015, 10:44 AM
#416
05-25-2015, 12:10 PM
#418
That is how I have positioned my CG. It has been unchanged since maiden 3 years (probably 100+ flights, I have lost count).
Are you coming to Fyresdal Jetpower this year btw?
Are you coming to Fyresdal Jetpower this year btw?
05-25-2015, 12:47 PM
#419
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OKI! Will try this balancing. I`ve flown many MiGs but none as large as this one, so I`m a little timid, for no reason maybe. Anything I should look out for? Maiden soon I hope, if the weather lets up a little.
Would really love Fyresdal but too much of a drive, (1000km) so this year I can`t make it. Will seriously consider next year!
Would really love Fyresdal but too much of a drive, (1000km) so this year I can`t make it. Will seriously consider next year!
05-25-2015, 02:19 PM
#420
The Carf Mig is the easiest jet to fly of all my current jets (aw mig-21, Carf Eurosport and Air-c-Race L-29). Actually, it is even easier than the Boomerang Elan that I once had. The only things I can tell, is to go easy on the expo on elevator. It is a small elevator, and therefor not as efficient as many other models. I started at 35% expo on elevator, and ended at 15%, which is so little that I could most likely just drop expo. At 35%, the model became nervous at landing (flare), since you have to pull a decent amount of elevator to get the nose up at low airspeed. Talking about airspeed on landing..... The manual states that you can land the Mig very slow, and that is very true. The Mig will GLADLY start to bounce multiple times if you land fast. Been there, done that...and it is not pretty
Ailerons are not very effective, so get as much throw as you can, I got 30-ish mm measured at aileron root (don't recall what the manual suggests). Rudder is 50mm.
I use gyro (no expo)on both ailerons and rudder. Rudder is a must, ailerons makes it look like the real thing and not a model..
I actually like the Mig so much, that I have been close to buying one more several times, just to have one in reserve.
That said, there are issues with the kit They are related to the building prosess, and since you are ready for maiden, you have obviously solved them
Good luck with the maiden!
Ailerons are not very effective, so get as much throw as you can, I got 30-ish mm measured at aileron root (don't recall what the manual suggests). Rudder is 50mm.
I use gyro (no expo)on both ailerons and rudder. Rudder is a must, ailerons makes it look like the real thing and not a model..
I actually like the Mig so much, that I have been close to buying one more several times, just to have one in reserve.
That said, there are issues with the kit They are related to the building prosess, and since you are ready for maiden, you have obviously solved them
Good luck with the maiden!
05-25-2015, 03:16 PM
#421
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Thank You! You are soo right regarding the kit! - Not one of the hatches fits, the gear/door combination is a nightmare to get right, and so on....... Still I like it ! Thank you for the setting-up/flying advice, I will bear this in mind. I have not yet installed a gyro in mine, guess the maiden will take place in calm conditions anyway. :-)
05-28-2015, 08:07 AM
#422
Has anyone successfully updated the "old" kit to rework the hatch? I have the original version with the small nose hatch, and then the single piece hatch that runs from just forward of the canopy back to the vertical fin, to be attached with 4 (or is it 6?) screws after startup. I'd love to rework this for at least a quick release using latches, or even splitting the hatch into sections if possible. If anyone did similar and has pictures, that'd be awesome.
05-28-2015, 11:14 AM
#423
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Has anyone successfully updated the "old" kit to rework the hatch? I have the original version with the small nose hatch, and then the single piece hatch that runs from just forward of the canopy back to the vertical fin, to be attached with 4 (or is it 6?) screws after startup. I'd love to rework this for at least a quick release using latches, or even splitting the hatch into sections if possible. If anyone did similar and has pictures, that'd be awesome.
05-28-2015, 11:36 AM
#424
My Feedback: (1)
Has anyone successfully updated the "old" kit to rework the hatch? I have the original version with the small nose hatch, and then the single piece hatch that runs from just forward of the canopy back to the vertical fin, to be attached with 4 (or is it 6?) screws after startup. I'd love to rework this for at least a quick release using latches, or even splitting the hatch into sections if possible. If anyone did similar and has pictures, that'd be awesome.
05-29-2015, 04:58 AM
#425
If you find some pics let me know, thanks!
On to another question, which could probably be its own thread as it's not entirely specific to the CARF MiG - I'm swapping in the Intairco retracts for the originals, and upon bolting in the new nose gear and right main, I hooked up the whole system, filled it to ~120 psi, but there just isn't enough oomph to retract the gear. It extends fine, and will unlock the gear when I slide the valve to close them but won't bring them up into the wells. There's no obstruction keeping them from going, and I can push them closed by hand. So I pulled the main gear out and hooked an air compressor directly to the "up" side of the cylinder. From down and locked, even air straight out of the compressor doesn't bring the gear to up/locked. Per the gauge on the compressor itself, I'm pressurizing the line/cylinder to well over 100 psi.
You guys have any idea what this would indicate? In my head it can only be one of two things, the pivoting gear leg is clamped too tightly in the mounting bracket (seems unlikely) or the piston is meeting a lot of resistance in the cylinder. I tried getting a little bit of oil into the cylinder and will try more if necessary when I get back to working on it, just thought I'd check in and see if anyone has had similar issues with this or any other pneumatic gear and have some suggestions.
On to another question, which could probably be its own thread as it's not entirely specific to the CARF MiG - I'm swapping in the Intairco retracts for the originals, and upon bolting in the new nose gear and right main, I hooked up the whole system, filled it to ~120 psi, but there just isn't enough oomph to retract the gear. It extends fine, and will unlock the gear when I slide the valve to close them but won't bring them up into the wells. There's no obstruction keeping them from going, and I can push them closed by hand. So I pulled the main gear out and hooked an air compressor directly to the "up" side of the cylinder. From down and locked, even air straight out of the compressor doesn't bring the gear to up/locked. Per the gauge on the compressor itself, I'm pressurizing the line/cylinder to well over 100 psi.
You guys have any idea what this would indicate? In my head it can only be one of two things, the pivoting gear leg is clamped too tightly in the mounting bracket (seems unlikely) or the piston is meeting a lot of resistance in the cylinder. I tried getting a little bit of oil into the cylinder and will try more if necessary when I get back to working on it, just thought I'd check in and see if anyone has had similar issues with this or any other pneumatic gear and have some suggestions.