RE: Top Flite Giant Corsair ARF Disappeared.
Got out to the field early this morning luckily the day was dead calm and clear skies. I was up till 3am buttoning up the last things and balancing the plane.
CG per the manual I started to set up the CG machine at 146mm but soon realized the CG machine is too small to deal with this plane inverted. The foam pads slip and spread out on the gull wing. I came up with a simple solution to balance it. I have two aluminum D-rings used for climbing and 40lb test steal braided leader line. I looped one end around each wing spar and then the other end to a D-ring per side. Now I had handles. With the plane in the foam cradle I could pick it up from the wing spar inverted.
Wing spar face to the LE = 143mm
I had to add 1lb 14oz to get it level.
At the field with the cowl off I ran the DLE 55RA with a Zinger 22X8 for 15min at about 2000rpm and then through the range to get a feel for the engine and temps. All running normal and crisp response from the carb per factory settings. As it ran in towards the end I leaned the Low end needle 1hr.
I was more concerned about the in cowl temps so since there is no access to the needles I richened the High end needle 1hr to anticipate it. With the cowl mounted the engine run up and shut down the cylinder side temp was 167F, fin temp was 250's and running OK. Throttle response still great no hesitation. Good to go...
First flight, dead calm wind, perfect conditions, applied power to get it rolling. I notice you have to get ahead of it with the rudder because there is a slight delay in response at fast taxi to take off speeds. Otherwise pretty easy take off. I was anticipating the typical power up nose over pitch but that didnt happen. The tail came up and started tacking OK.
First couple laps very little trim needed and tracking just fine. I pulled the gear up after one lap again no problems no change in trim. I got up to high altitude and made several stalls into the wind and with the wind to see how it goes. The left wing drops, no flaps, low throttle slowing it down with increasing up elevator waiting for the snap. Fairly predictable, it gets very washy just before it departs. The rudder is pretty effective but you will use all of it until the end to keep it tracking straight.
Recovery was easy drop the nose add power and redirect but you lose a lot of altitude.
After the stall tests I wanted to see how the flaps effect pitching so at about half power I dropped 50% flaps and went around with very little change in back pressure on the stick. Then I dropped the gear, same power setting, no real changes, then flaps full I had to add more up elevator but still minimal. I made a few laps like this to judge sink rate and speed, all good, still dead calm. I made a couple low slow passes over the runway to feel it out. The Corsair is very stable all dirtied up I was very pleased with it and it looked the part passing by.
Touching down was pretty normal and no drifting around, touch down and planted thats it right down the center. NOTE I have a couple degrees of toe OUT on the mains and its perfect for me.
Next flight the winds/gusts arrived so I took off in calm conditions but the wind picked up to 10-15mph pretty quickly. I did notice the plane hunt and wag in the wind while before in calm air it tracked perfect so the wind does effect it quite obviously. I made some low high speed passes and basic rolls and loops this time all good as expected.
Set up to land in the wind I dropped full flaps again to see how it goes. For sure once the wind picks up full flaps makes it hard to land and you will find the plane bobbing and ballooning on approach. Brought the flaps up to half and the landing was smooth. By this time the wind sock was straight out from the post.
Mine is set up with a pilot figure, tail wheel doors and I added an extra small Robart air bottle to increase the volume. The Robarts worked great no hang ups or loss of air. I installed restrictors on the up and down circuits to slow them and it works perfect. Each wheel comes up one at a time, pretty scale effect. Who says you need electrics!?
I was not impressed with the rudder as it comes from the factory so to help matters I slipped a carbon tube over the unsupported section of linkage to take away the flex. This helped but did not cure the deadband in the rudder. The main issue is with the rudder torque rod, it twists, and since its built into the tail I had to leave it alone for now.
So Im pleased with the plane and its performance so far. Now Im going to go ahead and finish the exterior in a USS Bunkerhill scheme with a yellow nose. The dark blue in the sky was OK but the yellow nose and white arrows will help out.
I have to say that with the weight of this model the skin is very soft, dings easy and makes handling the model sketchy. If you have a bulky watch maybe take it off or you will ding the plane. When I flip it over I can feel it flex in my hand so an open hand is required or it will be damaged, especially the fuse.
All in all pretty cool, its my "big" Corsair trainer for now until the CARF Corsair is ready! Composite is the way to go!