Sandancer's blog archive for December, 2010 - RC Groups
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Archive for December, 2010
Posted by Sandancer | Dec 19, 2010 @ 10:37 PM | 18,469 Views
I received confirmation from FMS that indeed the twin motors on the B-25 were 1000kv outrunners. They also confirmed that, although the 40A ESC's were rated for 2S-4S lipos, they strongly suggested running the plane on 3S lipos as the motors are only rated for 3S.

UP-DATE 01/01/2011: I received a couple of replacement motors from Hobby Partz. HPz lists these motors as 1050kv, but they have 900kv stamped on the leads? As soon as my G.T. Power RC Motor Testing Expert KV / RPM Meter comes in, I'll be able to run some tests and see what the kv actually is?
Posted by Sandancer | Dec 19, 2010 @ 10:07 PM | 18,311 Views
One of the first things I noticed was the location in which FMS decided to mount the nav lights? This just doesn't look right to me, so I will replace the red/green nav light in the forward edge of the wings with clear LED landing lights, and place the colored nav lights in their appropriate locations......wing tips.

UP-DATE 2/01/2011:
I've now have the Nav lights reconfigured to their correct positions. I've replaced the Red/Green lights FMS had installed in the landing light pockets with clear 10mm LED lights. I then installed 5mm LED starboard/green and port/red lights in the correct positions in their respective wing tips. I ran the wire leads thru the wing into the cavity just behind the landing light fixture, and then into the fuse. I also installed 2 beacon lights, one on the underside of the tail, and the other on top midway between the gun turret and the tail.

B-25 Tondelayo__Nav Lights (1 min 32 sec)
...Continue Reading
Posted by Sandancer | Dec 19, 2010 @ 02:28 PM | 18,982 Views
This is my version of the MARINES DREAM FG-1D Corsair.

NOTE: The revised CG on the Corsair has changed from the original setting of 125mm to 85mm - 90mm.
I borrowed an illustration from Mike/RogueTitan on another way to measure CG on the Corsair.
Posted by Sandancer | Dec 19, 2010 @ 02:21 PM | 20,019 Views
Once again, I gotta have my retracting/steerable tail wheel assembly!

Corsair TailWheel Bay Doors (1 min 19 sec)

Because I am planning to run the heavier SK 5055 580kv motor on 5S, I don't expect my tail wheel will dramatically effect the already tail heavy issue? In fact, when everything is done, I won't be surprised I might have to remove some, or all of those weights already embedded in the cowl? With that in mind, I started my tail wheel mod. From what I've learned from my first two builds, (P-51 & P-47), the Corsair was going to be a breeze!

I once again used the PZ #15090/312 E-Tract. I flipped it around so the gear would retract towards the front instead of the scale rearward inclination for 2 reasons. One: There is more room to retract the gear forward into the fuse and not require having to weaken the tail section by removing additional foam towards the rear. Second: With the tail wheel deployed I wanted the weight transferred to the back stop of the retract arm as opposed to all the force that would be applied to the worm drive in the opposite direction.

I GG the mounting flange on top of the ledge inside the tail wheel compartment. Because that would move the assembly deeper, I had to machine an additional 3/16" length to the strut leg to achieve the height I wanted for the wheel to clear the fuse when deployed and give it a proper stance. Once I got the tail wheel done, I lengthened both the E-Tract and steering...Continue Reading
Posted by Sandancer | Dec 19, 2010 @ 12:13 PM | 19,695 Views
This plane has to be identified in the dark of night so of course it get's a set of Navigation lights too.

UP-DATE 2/12/2013: I have taken a different approach to how I wanted to configure the landing lights on the Corsair!

I've removed that single light pod design from the belly, and I've installed a more conventional 2 light system on the wing's LE. I used two 1W 90LM LEDs mounted in 1/16" ply and recessed in the LE of both wings. I have the wiring channeled back in to the flap servo cavities and the routed in to the compartment in the wing where I changed out the light controller to a Lazertoyz Maxi, that way I can turn the landing lights on & off separate from the other nav lights. I then covered both light's recesses with pieces of 3M packing tape to simulate lens covers.

Finishing up the mod, I used strips I cut from the roll of white Oracal651 vinyl I have, painted them to match the MM Navy Blue/Gray that I used on the bottom of the wings, and covered all the wire channels.

The Corsair looks much better now!

~~~~Thumbnails~~~~...Continue Reading
Posted by Sandancer | Dec 19, 2010 @ 12:12 PM | 18,253 Views
This is my version of the 50 cal. guns on the Corsair.

I utilized the same process for making the barrels like I did on the P-47. I know the original guns are black, but I like the way the aluminum enhances their appearance....Continue Reading
Posted by Sandancer | Dec 19, 2010 @ 11:18 AM | 17,745 Views

My original plans for the tail section was to figure a way to conceal the rudder linkage inside the tail assembly. I came up with a good way to do it, but with the advise from my good friend Tony/LiCobra, I shelved the idea when the issue of the Corsair being a bit tail heavy arose. Knowing I was going to be installing my workable tail wheel assembly, I decided against this mod in lew of that. I did install a small square CF spar in the tail end of the rudder assembly base because that area seemed to be a bit weak?

I did re-hinge both the rudder and the elevator with CA live hinges. My previous attempts at this mod on the P-51 & P-47 proved exasperating because I couldn't retain the CA from spreading onto the flexible part of the hinge, thus making them rather stiff! This time I took a different approach. Knowing I was going to be re-painting the plane anyway, I decided to install the hinges in their slots, then take a small bit and drill a hole into the foam and thru the hinge material. That way, when I shot the CA in the holes it would spread evenly through out the hinge material. Doing this procedure I was able to keep the CA from spreading to the hinging parts of the live hinges. Once everything was done, I filled the holes with Squadron White Putty.

Once the rudder was done, I started on the elevator. First thing was installing a .080 joiner rod in both control surfaces to eliminate the need for 2 servo linkages. I did this...Continue Reading
Posted by Sandancer | Dec 12, 2010 @ 11:40 PM | 18,697 Views

An issue that seems to have developed here lately is the fact that some of the planes being delivered now, have the cowl glued on the bulkhead of the fuse for some reason? That glitch has already been reported to FMS, and should have been rectified on the assembly line by now?

Fortunately, the cowl on mine wasn't glued on, so removing it was a breeze. But doing so reveled an entirely different issue I would have to deal with!

It looked like someone on the production line forgot to line up the firewall before they glued the two halves together! To correct this I had to split the forward section of the fuse apart so I could orientate the firewall in the correct position. Upon doing so, I discovered something interesting in the lower section of the cowl bulkhead? It appears FMS needed to counter balance the tail heavy issue on the Corsair by embedding 3-4 oz. of weights in the nose? This should be a viable solution if you're running the stock set-up! I plan to run the heavier SK 50-55 580 with a 5S lipo, so when I'm done with the build I might have to remove these weights to get the proper balance for CG?

Okay, I got my engine compartment issues solved, so now I need to figure out how to re-attach the cowl without the aid of glue? My solution was good 'ole rare earth magnets! My first shot was with the 3/8" round ones, but I didn't feel confident they had enough strength to hold the cowl in place? So I pulled them back out and replaced...Continue Reading