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Curare build - 12/22/2006 6:23:10 PM   
handglider



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From: Hotlanta, GA, USA
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I am starting a Curare build from MAN plans. I am making templates for formers, fuse sides, cores etc in the next week. Has anyone recently built a MAN Curare - is there anything that might need changed from the plans?

I've got some really nice contest wood and a 20 some year old NIB Webra Speed 61 rear that will be the heart beat....

I also have a Super Curare fiberglass kit that I'll be working on as well. I've got a YS 61 rear lined up for that build....

I'll have some photo's next week when I start cutting wood : )

cheers,

Dean



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RE: Curare build - 12/22/2006 7:39:39 PM   
nxtdoor


 

Posts: 297
Joined: 6/5/2002
From: Tulsa, OK, USA
Status: offline 		I am currently scratching a Curare from the MAN planes. I built and flew one in competition back in the mid 70's when the plan came out. Great plane even if the plans aren't the best.

I already have the stab and the wing mostly done. I cut my own cores with thinner airfoils for a little more speed and reduced the wingspan marginally. Am putting the speed flaps on it as per plans. They worked great on my first one. Once I get the wing done, it's on to the fuse. Will be putting a JettFire 90 in mine. Will use covering on the wing and glass the fuse maybe; haven't decided.

Have spring airs for the gear.

With the JettFire spinning an 11x9 at close to 15-16,000 on the ground, it ought to move out. Love ballistic pattern planes.

Good luck on yours.

Jeff

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RE: Curare build - 12/22/2006 7:39:42 PM   
Steve25


 

Posts: 80
Joined: 12/14/2005
From: Antwerp, BELGIUM
Status: offline 		Hello Dean,

I've just seen a plan from MAN , it seems it's not the same as the original MK plan.
From one source ( close to Hanno ), I heard that it would not be a good idea to put a rear exit on it, as defenitely, the Curare was designed to have one UNDER the wing, for balancing- issues.
You meight save that NIB engine for a Magic , etc. If you would be in need for a Webra Speed, I can get my hands on NIBS and used ones ( Prolly have one to much myself ).
Concerning the plan , there are mods according to flaps, and changes on the tail, as in the other threat was pointed out http://www.rcuniverse.com/forum/fb.asp?m=5148232

Can't say a lot about the Super ( don't know that ).

Anyway, as a Curare / Mk enthousiastic, I will be following closely, and wish you good luck with the building as well as the flying.

Merry Xmass to all !

greetz,

Steven

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RE: Curare build - 12/22/2006 9:55:57 PM   
Bootalini


 

Posts: 146
Joined: 9/5/2006
From: Ottawa, ON, CANADA
Status: offline 		I look forward to following this build.

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RE: Curare build - 12/22/2006 10:21:46 PM   
handglider



Posts: 694
Joined: 3/14/2005
From: Hotlanta, GA, USA
Status: offline 		I received the rest of my wood today - I have really nice 3" x 55" x 1/4 contest wood for the fuse sides - I won't have to splice 36" wood to build the sides with. So I think my wood is in order to start some serious building right after christmas.

I didn't know about the plane being designed for side exhaust engines - Somewhere on one of the curare threads I saw one with a rear exhaust engine, I thought it looked cleaner and I have been collecting rear exhaust engines all summer - I have the NIB Webra rear, a NIB OS 61R and a used YS 61 rear.

If it is really going to make a difference I would be interested in trading if anyone needs a rear exh. engine. Maybe I should just sell them all and get a couple Jetts...

I'll post some pics next week, I am excited too. This plane has always been on the top of my favorites list, since I was in high school, way back in the 70s.

cheers all, have a great holiday,


Dean

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RE: Curare build - 12/22/2006 10:55:19 PM   
nxtdoor


 

Posts: 297
Joined: 6/5/2002
From: Tulsa, OK, USA
Status: offline 		There is no reason not to use a rear exhaust on the plane at least from my experience back in the 70's. Mine flew fine; won a lot of trophies with it. There is defintely an advantage to using the rear exhaust in that you don't have to take the pipe off with the wing if using a side exhaust.

Jeff

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RE: Curare build - 12/23/2006 12:13:43 AM   
8178



Posts: 3015
Joined: 5/25/2004
From: _ , USA
Status: online
quote:

ORIGINAL: handglider

I received the rest of my wood today - I have really nice 3" x 55" x 1/4 contest wood for the fuse sides - I won't have to splice 36" wood to build the sides with. So I think my wood is in order to start some serious building right after christmas.

cheers all, have a great holiday,


Dean


Dean,

You realize that it is really cheating using one piece sides and missing out on doing the wonderful splices! Just kidding! I didn’t realize that they used ¼” wood on the sides of the Curare. I’m looking forward to following your build.



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RE: Curare build - 12/23/2006 12:50:07 AM   
rainedave



Posts: 5168
Joined: 7/21/2005
From: Greensboro, NC, USA
Status: offline 		Dean, I look forward to your build!

Here's an issue that arose on the MAN plans a while back. The root chord on the wing plan view is confusing. In a past thread I drew this diagram showing the actual outline of the foam core (blue and red lines), which isn't actually drawn on the plans. The green line shows where the core can be relieved for a solid wing bolt block. Compare the length of the red line to the chord of the root template on your plans. The red line is the correct root chord.

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RE: Curare build - 12/23/2006 1:26:33 AM   
CoosBayLumber


 

Posts: 2990
Joined: 1/20/2002
From: San Bernardino Calif
Status: offline 		I dunno know if you are interested in this now that you have begun work on a Curare' from the M.A.N. plan, but I have the A/C set for laser cutting. Instead of a foam wing I went to a wooden build up one.

There are just so many problems with the M.A.N. plan that I had to draft up my own using Autocad. I had a rough set of plans made up nearly two months ago, and a friend whacked the A/C into the ground at better than 100 MPH it looks.

First thing which has been mentioned here several times is the inconsistant wing chord and airfoil(s). I ahd to use an airfoil program to sort out the lumps and bumps.
Second thing is, gee I'd like to find a retracting nose gear that actually shortens up 1/2" upon retraction. I am using the common Hobbico gear set, and had to move a few things around at that.
Third, is the sides are actually 5mm thick. Says so on other plans, and is an equazion at bottom of the M.A.N. plan. This is a bit thicker than 3/16" and I had to make mine from old metric stock I once got when Superior was going. Am going to make up a few more semi-kits next January after I get some shop machinery going OK.

I don't own a Webra Speed, but have been planning on a GMS .61 for power. Good enough for my style of flying. No plans yet, but if interested in parts ship me a P.M.


Wm.


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RE: Curare build - 12/23/2006 1:45:17 AM   
Razor-RCU



Posts: 5285
Joined: 3/21/2002
From: Ramona, CA, USA
Status: offline 		Sweet! Bring Ballistic pattern back!

I have a YS-60RE that I am saving for an EU1A or a Curare/Tipo/ Aurora


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RE: Curare build - 12/23/2006 3:48:24 AM   
spbyrum


 

Posts: 113
Joined: 11/22/2002
From: Cullman, AL, USA
Status: offline 		Guys

I have built 5 Curares for SPA use from Man plans. The first two were from Balsa USA cores. The last three from cores I cut myself according to the MAN plans. I didn't notice any difficulties with the cores according to plans.

If you are a purest, stop reading now. Don't want to ruin anyone's Christmas.

A Curare for SPA use requires a little modification. The engine of choice for SPA is a 91 4c. I prefer to mount my engines inverted, so I had to widen the firewall 1/2". Other formers and the nose ring were widened appropriately to maintain proper appearance. Mine is a tail dragger with elevator and rudder servos mounted well back in the fuse for balance purposes. The tail has also been stretched a bit for the same reason.

When building the first one, an old vet said I should reduce the dihedral. Don't do that. Build according to the plans and you should not need significant mixing.

If you're cutting your own cores, go ahead and cut and sheet a foam turtle deck, too. You can save a couple of days of carving and sanding and 4-6 ozs overal without giving up any structural strength.

I have used cut-down Arresti 40 canopies on all mine. If you want a clear canopy, I think the small U-Can-Do replacement canopy can be cut down, too.

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RE: Curare build - 12/23/2006 4:37:39 AM   
handglider



Posts: 694
Joined: 3/14/2005
From: Hotlanta, GA, USA
Status: offline 		Wow all,

thanks for all the replies....

I was already thinking about doing a set of formers and sheeting the top turtle deck as well. Doing a foam turtle deck is a great ideal. Looking at the plans - you can draw a line from the canopy floor to the back of the fin LE which would be the bottom line of the turtle deck. I was looking at that 1" triangle stock that that the plan indicates and the taper you have to create towards the tail would/will be fairly time consuming.

I was also thinking of doing a built up 2 piece wing with laser cut ribs.

What are the differences between the MK plans and the MAN plans ?? From some of the pictures of the MK Curare - it does look like the turtle deck is sheeted wood over formers - is that right??

Does anyone have a set of MK plans I could get a copy of ??

Lots of great ideals. Please keep them coming.

I haven't cut any wood yet : )

cheers!





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RE: Curare build - 12/23/2006 6:48:24 AM   
pimmnz


 

Posts: 511
Joined: 11/9/2005
From: Auckland, NEW ZEALAND
Status: offline 		If you can, then get a hold of the RCM&E plan (the web address is in the forum somewhere) all wood, reasonably accurate formers and shows the original (1975) Curare with the simple (Sicroly) type flap. Built to the plan with a HP Gold cup .60, mech. retracts with two retract servos and Solarfilm finish it flys at 6.75 lb. I can supply the original magazine article that goes with it too.
Evan.

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RE: Curare build - 12/23/2006 2:22:09 PM   
Steve25


 

Posts: 80
Joined: 12/14/2005
From: Antwerp, BELGIUM
Status: offline 		Hello Dean,

For now, I have a plan of the MK Curare 40 , but could be that I obtain an original MK Curare kit, then I could provide copy of the MK Curare 60 plan as well.
The tail of the fuse (turtle deck ? )is indeed sheeted wood over formers.

I also notice on the MAN plans that the wing is mounted by one Dowel, on the MK plan this is by two dowels.
Could provide some extra stability between wing and fuse ? Takes away some load from the place where you bolt it on.

Performance : the last ~40 flights was with an old FSR .40 that refused to perform at more then 60% after I closed my throttle from full. with 50 -60%Throttle , I managed to keep on making loopings, and climb out out of any problem. But I must say that taking off from grass with this engine was an issue, but I guess this was due to the state of the engine.
After replacing it with a .46fx, with the same 10x6, this was not an issue.
Unfortunately, during first flight with this engine I had a weird crash.

my point : no weight issues with the whole setup

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RE: Curare build - 12/27/2006 4:32:42 AM