RE: Cessna Skymaster 336 (Royal Kit )

RE: Cessna Skymaster 336 (Royal Kit )
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RE: Cessna Skymaster 336 (Royal Kit ) - 7/27/2006 3:48:24 PM

MMallory

Posts: 1112
Joined: 12/11/2001
From: South Plainfield, NJ, USA
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Pete, I'll try to remember to weigh it for you. I think it is around 11 lbs. I have larger holes in the cowl and I run the rear engine pretty rich for cooling. No problems with overheating.

The struts may not be functional by design (I don't know for sure). As I mentioned the builder of my plane is of unknown origin and it is possible the need for the struts on mine is due to poor building technique.

Mark

< Message edited by MMallory -- 7/27/2006 4:11:54 PM >

(in reply to jmupilot)

Post #: 51

RE: Cessna Skymaster 336 (Royal Kit ) - 7/28/2006 8:11:32 PM

atsioukl

Posts: 148
Joined: 11/18/2003
From: Old, FL, USA
Status: offline

Hi Pete,

You are correct - the booms are permanently attached to the wing on my 336. Before doing this though, I had to make sure the entire wing assembly fit into my SUV. And I tell you what, it barely makes it!

Anyhow, I hope to get lots more done on the airplane this weekend. I'll make sure to post more pics.

Good luck with your first flight - I'm sure things will turn out just fine.

Anthony

(in reply to jmupilot)

Post #: 52

RE: Cessna Skymaster 336 (Royal Kit ) - 7/29/2006 2:08:23 AM

jmupilot

Posts: 380
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From: Harrisonburg, VA, USA
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I tried to uplonad pics here in the thread but i couldn't get them to post, so I put some in my Gallery.

Pete

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Post #: 53

RE: Cessna Skymaster 336 (Royal Kit ) - 7/30/2006 1:40:00 PM

atsioukl

Posts: 148
Joined: 11/18/2003
From: Old, FL, USA
Status: offline

Pete,

I know that I have seen and commented on you 336 before, but, I must tell you again that it looks AWESOME! You did an excellent job building and finishing. I can't wait to hear how your first flight goes.

Anthony

(in reply to jmupilot)

Post #: 54

RE: Cessna Skymaster 336 (Royal Kit ) - 11/20/2006 11:52:30 PM

whvandy

Posts: 41
Joined: 10/20/2002
From: Gap, PA, USA
Status: offline

Hey Guys, I'm also building a 336 Royal kit. The struts are missing. Any help on how to build struts would be appriciated. And how to secure them to the wing/fuse. I was thinking 2 70 Surpass for power, think the exhaust will clear? Thanks, Bill

(in reply to atsioukl)

Post #: 55

RE: Cessna Skymaster 336 (Royal Kit ) - 11/21/2006 5:09:52 AM

hattend

Posts: 2050
Joined: 11/29/2001
From: Redding, CA, USA
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quote:

The struts are missing. Any help on how to build struts would be appriciated. And how to secure them to the wing/fuse.

Bill,

I build struts out of 1/4" dowels and 1/2"x 1/4 balsa sticks.

Use adhesive backed sandpaper and put it on the dowel. Sand a concave "nest" in the balsa stick and then CA the dowel into the stick.

On one end carefully cut a slot and epoxy and pin a plastic hinge. On the inside of the fuselage, epoxy a square piece of basswood and cut a hole in the fuse for the end of the hinge to mate with the basswood. Then epoxy a piece of basswood on top of the hinge so you have a tight fitting basswood/hinge/basswood sandwich. Drill through the sandwich for a 6-32 bolt and thread the basswood using a 6-32 tap.

Now, measure the strut length, cut to correct length and make the other end similar to the first one. Drill a hole for a 6-32 bolt in the hinge and drill and tap a hole to accept a bolt in the wing (you should have already built the bolt platform, right?)

Remove the bolts, Take the strut out and sand the balsa stock to an airfoil shape. Use some filler at the glue line if you need to.

Don

< Message edited by hattend -- 11/21/2006 9:00:51 PM >

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Post #: 56

RE: Cessna Skymaster 336 (Royal Kit ) - 11/21/2006 1:40:42 PM

whvandy

Posts: 41
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From: Gap, PA, USA
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Thank you very much, Don. Will try your method.... Bill

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Post #: 57

RE: Cessna Skymaster 336 (Royal Kit ) - 11/21/2006 6:23:52 PM

hattend

Posts: 2050
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From: Redding, CA, USA
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Bill,

Here is a set of Struts I made for a Goildberg Cub.

It is similar to the description I gave above. The good news is you only have to make a single strut on each wing. I covered it with monokote after final sanding.

Post #10

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Post #: 58

RE: Cessna Skymaster 336 (Royal Kit ) - 11/21/2006 6:32:40 PM

whvandy

Posts: 41
Joined: 10/20/2002
From: Gap, PA, USA
Status: offline

Don, read the other post, struts look great! One question, is the strut made from one strip of balsa or two like a sandwich around the dowel? Thanks, Bill

(in reply to hattend)

Post #: 59

RE: Cessna Skymaster 336 (Royal Kit ) - 11/21/2006 8:54:58 PM

hattend

Posts: 2050
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From: Redding, CA, USA
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The dowel is the leading edge of the strut. The balsa behind the dowel is sanded to form the airfoil section.

BTW: I had a typo in post #56. Don't drill a 6/32 hole in the hinge but drill a hole to pass a 6-32 bolt. Sorry 'bout that.

Don

< Message edited by hattend -- 11/21/2006 9:03:49 PM >

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RE: Cessna Skymaster 336 (Royal Kit ) - 11/23/2006 3:50:42 AM

jmupilot

Posts: 380
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From: Harrisonburg, VA, USA
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You do have the plans for the 336 right? The struts dont go out on the wings of the 336, but attach to the bottom of the tail booms. Mine are very short about 4 inches long I think. I'm not sure they are really funtional on the royal kit but I have mine on anyway. You can see then in one of the pictures in my gallery. I still havent gotten the nerve to test fly mine yet. Damn it's just to nice to look at. Maybe one of these days I'll get it in the air. There is another one flying in our club, and its look great in the air. The owner says its a piece of cake to fly.

Pete

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RE: Cessna Skymaster 336 (Royal Kit ) - 11/23/2006 3:31:01 PM

whvandy

Posts: 41
Joined: 10/20/2002
From: Gap, PA, USA
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Pete, I do have the plans, but they are kind of vague as to exactly where the top and bottom attach fairings are located and how to attach them. I'm thinking with the weight of the a/c the struts are functional, so the attach fairings have to be more than just glued in place... What are your thoughts, guys??

Bill V.
Gap, PA

(in reply to jmupilot)

Post #: 62

RE: Cessna Skymaster 336 (Royal Kit ) - 11/24/2006 5:20:46 PM

MMallory

Posts: 1112
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From: South Plainfield, NJ, USA
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Bill,

On the Royal kit the struts are functional. Mine are attached to the bottom of the booms and near the gear on the fuse. Just glued into a slight groove sanded in the surface. My struts are simple plywood notched to mate with shorter ply mounts.

Mark

(in reply to whvandy)

Post #: 63

RE: Cessna Skymaster 336 (Royal Kit ) - 11/26/2006 4:11:31 AM

atsioukl

Posts: 148
Joined: 11/18/2003
From: Old, FL, USA
Status: offline

quote:

ORIGINAL: whvandy

Hey Guys, I'm also building a 336 Royal kit. The struts are missing. Any help on how to build struts would be appriciated. And how to secure them to the wing/fuse. I was thinking 2 70 Surpass for power, think the exhaust will clear? Thanks, Bill

Bill,

The struts on this kit are built by sandwhiching together 2 pieces of what appear to be 1/8 ply. These pieces are to then be sanded into an airfoil shape. As Pete mentioned above, the struts do not attach directly to the wing, but rather, to the bottoms of each boom.

If you go back to page 2 of this post, you'll see some pics of my 336 at primer stage. You can clearley see how the struts will be attached.

As for power, I too chose 2 OS 70 4-strokes. It's a bit more than what's recommended but I'd rather be safe than sorry in the event of an engine out. As for the clearance on the 70's, if you do it right, you should only have a small portion of the valve cover sticking out. Unfortunately, there is no way to completely conceal them in the cowling. I think I also have some pics of my engines moutnings in this thread. Page back and look.

Hope this helps.

Anthony

P.S. to Pete - I can't beleive that you still have not flown that pretty 336 of yours. Hurry up and get it up in the air. : )

(in reply to whvandy)

Post #: 64

RE: Cessna Skymaster 336 (Royal Kit ) - 11/29/2006 2:18:32 PM

mystar46

Posts: 163
Joined: 11/4/2005
From: Kennett Square, PA, USA
Status: offline

Hi all, I bought this kit new back in the early '90's and have partially completed it. I am making mine an O2A. I want to do a pretty good scale job on it.
Royal's "glue blocks of balsa together and carve an airplane out of it" methodology leaves much to be desired. I've been looking for a suitable fiberglass cowl to modify and replace the front end of the plane from the firewall forward. I'm thinking a 1/5 or 1/4 scale Cessna 182 cowl might do the trick. Don't laugh, but I'm also determinied to put retracts in this thing. Just coming up with a concept of how it will work is very challenging. The mains drop down and come together and then fold back into the bottom rear of the fuse. The nose folds forward up into the cowl. (another reason to go with a fiberglass cowl.) If anyone else has been thinking about this or actually has something that works please let me know.
I have the fuselage basic frame completed, the wings framed but not sheeted and the horizontal stab framed. I'm getting tired of looking at it sitting on the shelf and would really like to get going on it this Winter.
I was surprised to see a fellow club member (whvandy) building the same plane. Bill, maybe we can share some ideas about this model. I was also thinking about using OS .70 4-strokes for power. The RCV 60SP engines might also be a good choice to keep things scale and leave plenty of cooling room around the engines.

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(in reply to atsioukl)

Post #: 65

RE: Cessna Skymaster 336 (Royal Kit ) - 11/29/2006 2:48:15 PM

MMallory

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From: South Plainfield, NJ, USA
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