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Peck Polymers Nesmith Cougar (Read 6836 times)
RussLista
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Re: Peck Polymers Nesmith Cougar
Reply #60 - May 28th, 2007 at 3:02pm
 
Nice build Alan  Smiley
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Alan_Cohen
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Re: Peck Polymers Nesmith Cougar
Reply #61 - May 28th, 2007 at 4:05pm
 
Thanks! It was a lot of fun.

I just got it back from the park. It spun around nicely on .085 rubber, but when I switched to .1" it practically giggled with glee. The wind was up a bit, but it handled it well and did about 50 seconds a few times getting to about 75' with about 1100 turns. The rubber could have handled a lot more, but I dared not without risk of losing it.

This is definitely a winner.
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Dave W
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Re: Peck Polymers Nesmith Cougar
Reply #62 - May 28th, 2007 at 6:20pm
 
Really nice Alan. You build a lot faster than I do!

The details add a lot of character. I really like the exhaust pipes, intake, and wheels. I wish my kit had a laser cut intake. I gave up making one after three or four tries.

I went flying yesterday and worked on trimming my Cougar. The CG seems about right but the plane was stalling a little. I added a bit of clay inside the nose block. I'm getting some good flights now. The Nesmith Cougar is a good little flyer. Some of my fellow club members have warned me not to fly it outside because I'm likely to lose it.

Here is a picture of me and my Cougar yesterday with the Marin Aero Club:
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Marin Aero Club
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Dave_K
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Re: Peck Polymers Nesmith Cougar
Reply #63 - May 28th, 2007 at 6:55pm
 
Dave and Alan I have to ask how you covered your stab and rudders? Did you preshrink etc?  Looks warp and wrinkle free (something I am still having a hard time achieving at the same time)

Thanks

Dave
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Dave W
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Re: Peck Polymers Nesmith Cougar
Reply #64 - May 28th, 2007 at 8:10pm
 
Hey Dave!

For the tail feathers I pre-shrank the Esaki on a frame and doped with 50% nitrate while still in the frame. The rest of the plane was covered with wet tissue (as explained by Duco Guru) and given one coat of 50% nitrate dope. I mixed in a little Sig retarder.

By the way, MAC seems to have gotten a reprieve (at least temporarily) and we will be flying indoors at St. Vincent's on the 4th Sunday of each month until further notice. Come on down! Lately, MAC has been flying outdoors at Lakeville Rd. on the 2nd Sunday of the month.

DW

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Dave_K
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Re: Peck Polymers Nesmith Cougar
Reply #65 - May 28th, 2007 at 8:32pm
 
Great I will do that on my next light tail feathers.  I was just talking to Tom Witworth about getting on the MAC mailing list earlier today.  I do not have anything to fly indoors yet but I am sure I will build some indoor stuff next winter, and I am planning to be there for the MAC meetings at Lakeville HWY. Thanks

Dave
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Alan_Cohen
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Re: Peck Polymers Nesmith Cougar
Reply #66 - May 28th, 2007 at 10:02pm
 
On this one, I used about 6.5# wood at 1/16" cross section on the rudder and stab. They were pretty hardy so I did not pre-shrink. I use the old dope method of adhering tissue and shrink with 70% isopropol and then touch up with water where necessary. The entire model is lightly doped and I have no worries that the tail will distort.

Nice looking group and gym you have there, DW! I really want to start a local club by me...
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« Last Edit: May 28th, 2007 at 10:04pm by Alan_Cohen »  
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lemuel
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Re: Peck Polymers Nesmith Cougar
Reply #67 - May 29th, 2007 at 2:21am
 
I have just finally got my Nesmith sorted out after 1 year of sitting on my shelf. All that i needed to do was reduce the size of the prop by a 1/2" and away she went. i am only putting on about 600/700 winds and i am getting about 28 seconds at the moment. i am afraid to apply more winds as i think that my rubber band will break so i might increase the length by a few inches to see if i can get more winds into her! for those interested i am using 2 loops of 2.2mm rubber. i think there is a pic of the nesmith at the beggining of this thread.

matthew
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Alan_Cohen
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Re: Peck Polymers Nesmith Cougar
Reply #68 - May 30th, 2007 at 3:46pm
 
Cry


I took the new plane out for a spin today and she caught a bit of a thermal. Just enough to throw her about 55' up into a maple tree. My 35' fiberglass pole didn't come close to reaching. I had to extend the pole 10' with fishing poles, stand on top of my 10.5' truck (while it was rockin in the breeze) and still had to extend my arms all the way. I managed to nudge it enough to knock it loose, just to discover that the prop & noseblock had wrapped around the branch. I tried pulling it but not good. I was finally able to grab the branch and rip it off. Down it came with the plane still attached. It was so tangled I had a hard time getting it loose while holding it in my hand, let alone with a 45' pole!

The good news is I got my wheels, nose and plane back. The only damage is the left wing needs rebuilding and the bottom of the fuse tissue is ripped. Might just replace the whole piece rather than trying to repair it. That's the advantage of covering with dope. Just a little thinner and the old covering comes right off. The wing will be a little trickier...
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dimeflyer
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have a good day Sir/Mam

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Re: Peck Polymers Nesmith Cougar
Reply #69 - May 30th, 2007 at 5:01pm
 
A.C.
thats sad guy . Sad hope you can fix it Smiley
you just have to be carefull of the weight when you do a repair !   good luck !   George
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have a good day Sir/Mam &&George/Pat
 
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Alan_Cohen
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Re: Peck Polymers Nesmith Cougar
Reply #70 - May 31st, 2007 at 6:43am
 
On initial inspection, I thought I was going to be able to get away with a quick repair. I only saw 4 breaks, 2 on the LE and 2 on the TE. The plan was to glue, pin, wait and then repair the tissue.

Plan B - After the glue had time to set the wing still felt shaky. On further inspection I noticed the center spar was shattered. At this point I decided removing and rebuilding the damaged area was my best bet for a good result.

This is why I glue with aliphatic resin and cover with dope. It allows me to saturate the damaged tissue with thinner and remove it easily without weakening the glue joints as it would if I used solvent glue. If I used white glue to or glue stick to cover I would use solvent glue to build the structure.

All in all its not too bad. Especially after seeing john's mishap over on http://www.smallflyingarts.com/cgi-bin/yabb2/YaBB.pl?num=1180566079/9#9

That's just awful, John. My heart bleeds. Cry Remind me again...why do we do this?  Undecided
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Alan_Cohen
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Re: Peck Polymers Nesmith Cougar
Reply #71 - May 31st, 2007 at 7:03am
 
Back on the plan. It's convenient that this plane was so new that I hadn't removed the plan from my building board yet. Scarf joints cut at LE, TE and spar.
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Alan_Cohen
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Re: Peck Polymers Nesmith Cougar
Reply #72 - May 31st, 2007 at 7:06am
 
New parts in place and waiting for the glue to dry.
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« Last Edit: May 31st, 2007 at 7:19am by Alan_Cohen »  

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lemuel
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Re: Peck Polymers Nesmith Cougar
Reply #73 - May 31st, 2007 at 7:20am
 
Alan that is too bad mate. I little carbon fiber would go a long way wouldn't it. perhaps a few gussets. At least you get your planes back. My dad has lost a few that could never be returned. I can't wait to take the little nesmith out again with dad and the guys but that may be a little while off yet. Show us a pic of the finished masterpiece.


matthew
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Alan_Cohen
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Re: Peck Polymers Nesmith Cougar
Reply #74 - May 31st, 2007 at 7:35am
 
Since I don't own a piece of carbon fiber, I think I'll have to settle for some gussets. Not to big, but I'm thinking one at the LE, one at the TE and another one under the center spar. Squaring it all up will be the hard part. We'll see...
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Alan_Cohen
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Re: Peck Polymers Nesmith Cougar
Reply #75 - May 31st, 2007 at 8:04am
 
Since the rib that's still on the plane is set for the dihedral angle, I can simply use a piece of 1/4" scrap to act as the rib and pre-glue the gussets. In a perfect world this should give me enough surface area to ensure the wing sets just right when I mate them up...yeah right!
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Alan_Cohen
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Re: Peck Polymers Nesmith Cougar
Reply #76 - May 31st, 2007 at 12:21pm
 
Wing in place, glued and pinned. Fuse is pinched between 2" thick foam to keep it flat, wing tips propped up 1/2" per side and a straight edge in front to assure a nice straight wing.
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Re: Peck Polymers Nesmith Cougar
Reply #77 - May 31st, 2007 at 12:27pm
 
Glue is dry. Wings are even and no wash in or out on the repaired side. Now for the covering...
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Re: Peck Polymers Nesmith Cougar
Reply #78 - Jun 1st, 2007 at 5:51am
 
Tada...
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Alan_Cohen
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Re: Peck Polymers Nesmith Cougar
Reply #79 - Jun 1st, 2007 at 5:53am
 
A view from the top. There is a small tissue seam, but otherwise you can't tell it was repaired.
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