A10X Jet Trainer RTF Jet Cat P-60
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Posts: 331
Joined: 7/13/2002 From: Prior Lake,
MN, USA Status: offline
Well Andrew, you got me wondering and worrying about the weight. So, using the highly scientific method of putting all of the loose items in a grocery bag and standing on a bathroom scale while holding the bag and craddling the wing and fuselage in my arms, I'm at 15 lbs. so far. That's the good news. The bad is that here's what's missing:
Both Turbax fan units and Perry pumps (the engines themselves are in the 15 lbs.) The outlet nozzles The wheel well pods Counterweight in the nose The 2 Amp battery, which I don't have yet, will be heavier than the one I put in the bag (the battery will help some as counterweight in the nose). Neither the wing nor the fuselage have been glassed and nothing is painted.
Other than the heavy landing gear, I don't think I've done anything to add weight to the original design. I'm guessing that everything is pretty much on track per the plans. Even the gear may not be all that bad. I don't have anything to compare it to. It just seems heavy to me.
To be clear, here's what's in the 15 lbs.:
All of the on-board radio gear Landing gear, wheels and accessories Fuel tank Both K&B .45's Fully sheeted wing with wing tips Fuselage with a stack of planking yet to be added All of the control surfaces and nacelle hatches (which have been glassed) Hunter Dan (in training)
Let me know if you are encouraged or discouraged by this. I think we're going to be on the high side of the wing loading you mentioned.
Posts: 147
Joined: 12/31/2002 From: Oak View,
CA, USA Status: offline
Paul,
That is not sounding too bad to me. I would bet that we can get this plane really close to 20 pounds rather that the 22-25. I do not think that you will add more than 5 pounds with the stuff you still need to do. With the high lift wing, it should be ok at 45 oz/ft. It wont land like a trainer obviously, but we are way past that aren't we .
I have the wing and stabs done but not sheeted. All the control surfaces except the elevators are done and only half sheeted. I will dive into the fuse next week and start planning where servos and tanks will go.
Posts: 331
Joined: 7/13/2002 From: Prior Lake,
MN, USA Status: offline
Progress report:
The arrival of the landing gear allowed me to make some serious progress. After mounting the mains, I sheeted the wing and did the final shaping of the Hoerner wing tips (Edit: these are actually drooped wing tips, not Hoerner). In order to run the aileron servo leads and pneumatic tubing for the gear, I was going to simply poke holes in the ribs and leave some string in place to pull everything through later on. Of course, if anything went wrong, I'd have an impossible time of finding those holes again after the wing was sheeted. I thought of installing 1/2" diameter plastic tubing to act as a guide, or tunnel, but couldn't find anything. I ended up making little tunnels out of balsa. The webbing between the ribs is one wall, the wing sheeting would be the bottom, so all I had to do was insert two other side walls and cut passage holes in the ribs.
To complete the wing, I need to build the box under the wing that will form the bottom of the fuselage, attach the wheel well pods, cut out the hatches for servos and the landing gear, and cover it with figerglass cloth.
Thanks, Paul
< Message edited by pdmarsh -- 1/22/2006 7:34:29 PM >
Posts: 147
Joined: 12/31/2002 From: Oak View,
CA, USA Status: offline
Paul,
I see that you have your main gear setup already. I think that I have a solution to correct for the 1/2 inch deviation on the main gear from the plans. It will not be scale, but it will work. Get something like a Robart 440 series strut. This strut puts the wheel right under the strut instead of offset like you have it now. That way you do not have to move the pod over for the wheels and you are back in line with the plans.
Posts: 331
Joined: 7/13/2002 From: Prior Lake,
MN, USA Status: offline
quote:
ORIGINAL: Gry101
Paul,
I see that you have your main gear setup already. Andrew
Yeah, I kind of locked myself into the offset. The gear was made custom, so I can't replace it without some serious expense. I think I'll be OK. The pods will be a little more outboard than they should be, but that's fine.
Posts: 331
Joined: 7/13/2002 From: Prior Lake,
MN, USA Status: offline
Nose gear installation.
Since the nose gear of the A-10 retracts forward, installing a pull-pull steering system would have been difficult. I didn't want to install the servo in the nose for various reasons, so I looked at alternatives. I liked the sliding rod approach that Doug used on his A-10 (Doug's thread), but I didn't have enough clearance for the rod in my installation. I decided to try a push-push installation. So far, it looks like it's going to work great. Basically, two control rods are used, each one being split in the middle. When the gear extends, the split rods come into contact, when the gear retracts, the rods separate. Once everything is aligned and tightened, there is no slop. I put plugs in the split rod ends to make sure the plastic doesn't wear over time and introduce play into the setup. Along with the pictures, I made a short video of how it works.
Posts: 331
Joined: 7/13/2002 From: Prior Lake,
MN, USA Status: offline
The upper fuselage planking is done and rough sanded. Some of the planking around the cockpit will get cut away after I determine the location of the canopy. Also, the slope of the nose area in front of the canopy has to be built up to meet the leading edge of the canopy itself. There's still a lot of finish work to be done on the fuselage, but this is a major milestone. I also started work on the weapons pylons. One down, seven to go.
Paul
< Message edited by pdmarsh -- 1/22/2006 3:46:27 PM >
Posts: 796
Joined: 11/18/2002 From: 3, JAPAN Status: offline
quote:
ORIGINAL: pdmarsh
Horner wing tips. Thanks, Paul
Paul,
I don't want to seem like a know all and really envy the beautiful build you are doing but it seems to be a common mistake amongst model builders to mix droop and Hoerner tips.
Your wingtips are actually droop tips - Hoerner tips are different as they curve up from the bottom of the wing and are fairly common on light aircraft!
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RE: My A-10 Warthog Project - 
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