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Post by Garf on Jan 25, 2011 20:13:43 GMT -7
As I pick thru the remains of the Noblarf, I find that the wing is repairable. In fact, most of the model is repairable, but I am going to convert it into a profile anyway. If the fuselage isn't too bad, I will repair it and use it on one of the wings I have picked up in my travels. I also picked up an ARF Cardinal fuselage. This is going to be a case of mix and match. God only knows what I will end up with.
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Post by Garf on Jan 26, 2011 11:23:00 GMT -7
One of the questions that comes up in the conversion of an inverted engined model into a profile with side mounted engine is the engine thrust line and vertical CG. Since you are taking the cylinder and raising it in relation to the centerline of the fuselage, that raises the vertical CG. In theory, you need to drop the engine centerline to maintain the CG in the same spot. BUT that changes the engines thrust line. What difference that makes if any, I don't know. I might be better off to hang a massive muffler on the engine and heavy wheels and leave the engine C/L where it is. Any thoughts?
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Post by Garf on Jan 27, 2011 14:13:25 GMT -7
I just got back from a trip to the LHS. I found myself out of plywood for the doublers for the Profile Nobler. This place charged $6.99 for a piece of 1/8" X 6" X 12" plywood. That's about $15 for the doublers alone. Then they wonder why they are becoming a dying breed?
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Post by Garf on Apr 21, 2011 19:28:22 GMT -7
The profile fuselage is done. The repairs to the wing are pretty much done. I am in the process of installing the wing into the fuselage. I hope it doesn't end up tail heavy.
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Post by flyingtigre on Apr 22, 2011 9:02:36 GMT -7
I noted the high price for ply that you mentioned earlier, definitely high. I've never tried it but "Baltic Birch" costs a whole lot less. Available online and at your local Woodcraft store.
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Post by Garf on Apr 22, 2011 12:12:55 GMT -7
I can bring the costs down by buying large panels online along with balsa. I bought some profile fuselage blanks, 1/2" X 4" X 36", and got defective pieces. I sent in pics and they replaced them free of charge. I might be able to use pieces of the bad ones on smaller projects.
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Post by Garf on Apr 28, 2011 11:58:49 GMT -7
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Post by Garf on May 8, 2011 17:36:01 GMT -7
If the fuselage isn't too bad, I will repair it and use it on one of the wings I have picked up in my travels. On close examination, although most of the fuselage isn't too bad, the motor mounts are destroyed. Another one for the firepit. |
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Post by Garf on May 8, 2011 17:49:34 GMT -7
The elevator/stab assy. is installed. Next question is whether to install a traditional shape Nobler rudder, or continue with the dagger shaped rudder as on the Fronkensteen 4.
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Post by Garf on May 18, 2011 16:45:47 GMT -7
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Post by Garf on May 20, 2011 13:42:44 GMT -7
Skid done.   |
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Post by Garf on May 27, 2011 15:13:48 GMT -7
I've got most of the paint on this thing. I also have the main landing gear installed in a slightly unusual manner. It should work.
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Post by Garf on Jun 2, 2011 14:42:53 GMT -7
I wanted to run the engine I picked for this thing, the Brodak 40. SO, I figured I'd run several since I had the stand set up. I had some new glow plugs from England I wanted to try, so I put one in the Brodak and another in a problem Johnson. They both worked great.
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Post by Garf on Jun 7, 2011 20:38:45 GMT -7
This thing is pretty much finished. I put the tank from the earlier Noblarf on it to test run. It didn't seem to want to hold a setting. Here we go again.
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Post by Garf on Jun 10, 2011 16:50:42 GMT -7
I put a different tank on it and it seemed to help a little. Only a test flight will tell for sure.
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Post by Garf on Jun 12, 2011 14:04:19 GMT -7
I flew this thing today. I think the Brodak 40 has found a home. The plane has too much tip weight, and is very nose heavy. It turns smoothly, but will not turn a square corner.
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Post by Garf on Jun 14, 2011 17:22:40 GMT -7
Tip weight has been reduced, 3/4 oz has been added to the tail, prop has been changed, elevator throw has been increased. Now to test fly again.
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Post by Garf on Jun 19, 2011 12:51:42 GMT -7
Even with all added tip weight removed, the existing original tip weight plus the added platform proved to be too much tip weight. BUT, it's now managable. The added tail weight helped, but still needs more. It turns better outside than inside, which is opposite from the original NoblARF.
UPDATE:More tail weight has been added. I hung the plane by the leadouts. It hung nose down. With the added tail weight, it still hangs nose down, but less so.
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Post by Garf on Jun 26, 2011 12:04:15 GMT -7
Put up 4 more flights today. Seems slightly tail heavy with the added tail weight, but seems managable. I'd like to fit a light muffler. No real bad habits.
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Post by Garf on Jun 27, 2011 14:40:12 GMT -7
I ran it with a strap on muffler today. Sounds good. I'll fly it next time with this on it and see how it does.
UPDATE:The strap on muffler is an old DuBro unit from Ebay. It doesn't muffle all that well, but it will do. I put a TT 11-4.5 prop on it and it works fairly well.
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