RE: B-36 build thread and free plans

RE: B-36 build thread and free plans
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RE: B-36 build thread and free plans - 4/13/2008 9:52:49 AM

Boomerang1

Posts: 862
Joined: 6/24/2005
From: Sydney, AUSTRALIA
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I have been away at a scale rally this weekend & took the B-36, another 5 flights in the log book. It was a real luxury flying from a sealed runway.

The finish on my B-36 is a real mixture of methods. The fuselage is bare foam covered in brown wrapping paper using thinned PVA to apply it & seal it. Grey car primer & then silver car touch up paint from a pressure pack can is all that's used.

The tail surfaces are covered in clear solarfilm, roughed up with a nylon scouring pad. A light dusting of white car primer & then a couple of coats of Humbrol enamel sprayed on.

The wings are covered in some sort of polyester film, cannot remember which type. The tips are roughed up with the scouring pad & painted just like the tail.

The cowls are vacuum formed (as is the canopy) & painted with the grey primer/silver car paints as per the fuse. The upper & rear lower cowls are vacuum formed & the same shape. The under wing ducts are all different lengths & are also left & right handed. These are foam, papered & painted.

All the markings are hand painted with Humbrol enamel. - John.

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< Message edited by Boomerang1 -- 4/13/2008 9:55:05 AM >

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Post #: 101

RE: B-36 build thread and free plans - 4/14/2008 2:45:29 PM

xb36

Posts: 304
Joined: 2/15/2008
From: White Bear Township, MN, USA
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John,

Thanks for the comments.

I didn''t go in to detail because I haven''t yet made the servo mount for the nose gear. I thought that I would use rubber servo grommets to isolate vibrations a bit. I also thought that I would try to make a hard rubber coupler to connect the servo to the strut for steering. Although I haven''t bought a radio for this plane yet I do plan on using a programmable radio. The nose gear servo will get a percentage of the rudder. I did pick up the aluminum this weekend but I want to finish up the wing mount and the mount for the nose gear. I don''t like trying to work on too many areas at once.

I am not sure what to do with your second post that shows photos of your B-36. I would like to say that the photos are inspiring. To be a bit more honest, they are rather intimidating. I simply don''t know how to do detail work at your skill level. It would be easy for me to say that you ''raised the bar'' and that I will figure it out. Well, I will try to figure it out, but this will be my first attempt at detailing so I don''t expect to see results like yours. Perhaps the answer is for me to hold back any close-up photos. I say all this with a degree of humor but at the same time I really haven''t done anything quite as impressive as yours. You should be very proud of your work. You built a B-36 three years before me and it flies great on nicads and brushed motors. I am very impressed and it also confirms that mine should fly too. When RC Universe was down this weekend I discovered WattFlyer. I ran across a post that you put on WattFlyer. In your post you indicated that your B-36 weighs in at 10.5 pounds. I targeted approx 11 pounds. I don''t have any foam in my B-36 so you have the weight advantage there, but I will be using LiPo''s instead of NiCad''s so I have the advantage there. I am not sure about the weight difference with motors. I mention these weight differences because I didn''t really know what a reasonable target weight should be. Our B-36''s are almost the same size so I would be pleased with an 11 pound RTF weight.

I just realized that I forgot to bring the main gear struts with me to work so that I can ship them back to Century Jet so they can make them 2" longer. I guess I will have to get them shipped tomorrow.

It won''t be long before I start mounting the motors. Do you recall if you have any down thrust or are the motor shafts parallel to the runway? I just realized, when I say down thrust on a pusher prop, does that mean that the end of the motor shaft closer to the tail of the plane is higher or lower than the end of the motor shaft closer to the nose of the plane?

Thanks again for the comments John. Please keep them coming and include photos when possible. They are helping me build a better plane. If my detail work meets my satisfaction, then I will follow through and build another B-36 after this one to see if I can improve.

Mike Roerig
mikeroerig@gmail.com

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Post #: 102

RE: B-36 build thread and free plans - 4/15/2008 1:47:57 AM

FlyerInOKC

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Joined: 11/17/2004
From: Oklahoma City, OK, USA
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Hey Mike if you are worried about stripping the servo gears I have a solution. There is trick I use on tailwheels at the servo. I mount a E-Z connector to the servo arm and then pass a control rod all the way thru it. On each side of the E-Z Connector I put a spring and wheel collar to apply tension to the spring. This gives a steering mechanism that takes the stress off the servo when the wheel hits an irregular surface.

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Post #: 103

RE: B-36 build thread and free plans - 4/15/2008 3:09:55 AM

xb36

Posts: 304
Joined: 2/15/2008
From: White Bear Township, MN, USA
Status: offline

Mike,

Thanks for the suggestion. I like the idea of a spring taking up most of the shock. I will consider your suggestion. Perhaps this would be a good servo to have metal gears.

I was getting close to finishing up the support for the nose gear retract. I rechecked my measurements just before epoxying it in to place. It seems that somewhere I got my measurements off by 1/4" so I have to rework it a bit. I thought that I would have more photos to post tonight but it will have to wait until I shorten the mount by 1/4". I will try to get that finished up tomorrow night.

Thanks again for the servo suggestion.

Mike

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Post #: 104

RE: B-36 build thread and free plans - 4/15/2008 10:00:30 AM

Boomerang1

Posts: 862
Joined: 6/24/2005
From: Sydney, AUSTRALIA
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quote:

I mount a E-Z connector to the servo arm and then pass a control rod all the way thru it. On each side of the E-Z Connector I put a spring and wheel collar to apply tension to the spring. This gives a steering mechanism that takes the stress off the servo when the wheel hits an irregular surface.

This is an excellent idea & I use it on all my models including the B-36. Mine has a nyrod from the rudder servo, with the springs fitted at the servo end, all the way to the front of the model to steer the nosewheel. The device is available in kit form from Dubro http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXD646&P=7

I used a flat bottom clark Y wing like you. The motor/gearbox units I used beam mount like a normal model engine so all I did was make up some 1/8 ply plates & glue them to the lower sheeting of the wing. The engine thrust lines are the same as the lower surface of the wings. - John.

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Post #: 105

RE: B-36 build thread and free plans - 4/17/2008 3:18:20 AM

xb36

Posts: 304
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From: White Bear Township, MN, USA
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I had a post about servo wire and someone responded with a site that that had a servo arm called a servo saver. You can check them out here: http://www.servocity.com/html/servo_savers.html

I will add a photo of one from their site. I will order a few and see if they will work out for steering the nose gear. FYI they are $4

I have the nose gear pretty well installed in the B-36. I am making my mount brackets tonight. Perhaps I will get the brackets finished up tomorrow night.

photos when I have finished.

Mike Roerig
mikeroerig@gmail.com

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Post #: 106

RE: B-36 build thread and free plans - 4/17/2008 7:49:04 PM

FlyerInOKC

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From: Oklahoma City, OK, USA
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I wouldn't mine trying a few if they work. Its abought what you would have in a package of collars and E-Z connectors.

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Post #: 107

RE: B-36 build thread and free plans - 4/17/2008 8:19:54 PM

xb36

Posts: 304
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From: White Bear Township, MN, USA
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I should have added in my post, these 'servo saver' control arms are spring loaded to absorb shock from the nose gear.

I ordered 2 sizes. I suspect that I will get them on Monday.

I will let you know my impressions.

This morning I looked through their website at servo city. They have some very interesting control arms that could come in quite handy.

Mike Roerig
mikeroerig@gmail.com

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Post #: 108

RE: B-36 build thread and free plans - 4/20/2008 5:52:09 AM

Boomerang1

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Joined: 6/24/2005
From: Sydney, AUSTRALIA
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Hi Mike, pics have been published from the scale rally I attended last week, here are a couple to motivate you! - John.

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< Message edited by Boomerang1 -- 4/20/2008 5:53:14 AM >

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Post #: 109

RE: B-36 build thread and free plans - 4/20/2008 8:35:21 PM

FlyerInOKC

Posts: 388
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From: Oklahoma City, OK, USA
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Its pictures like that I look forward to see on your airplane and on mine in another year or two.

Mike

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Post #: 110

RE: B-36 build thread and free plans - 4/21/2008 3:53:39 AM

xb36

Posts: 304
Joined: 2/15/2008
From: White Bear Township, MN, USA
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Yes, those are impressive photos. I like the first one, you can see the front wheels have just lifted off. Someday I might post some flying photos....

Almost everyone in the family had the flu so it took away much of my spare time lately. I did make some progress though.

I will post a few photos of making the support for the nose gear. I started out by making the supports out of soft balsa, just to get it to fit. I then remade the mounts out of basswood. The bottom of the supports have slots that will tie in to the fuse formers. The basswood pieces are screwed together and also CA'd together. The support will also be screwed to the plywood fuse former. I still have some trimming to do. I can't finish this up until I know for sure how I am going to mount the steering servo.

The first photo shows the CAD image of the bracket that I thought might work to support the servo to the top of the strut. The next 2 photos show the bracket after I made one. Before drilling holes in the retract arm I held it in to place and attempted to rotate it to see how it all worked. Well, it did work, but I didn't like how much of the plywood former that I would have to cut out. I tried rotating it by 90 degrees and came up with a 2 post mount. In the next post.... I will show 5 CAD images of the retract rotating in, and a photo of a servo with the 2 posts just to give you an idea. I will try to figure out how to add more support to it than just the 2 posts. The 2 post option is great because it does not require any more of the plywood fuse former to be cut away. I will be able to finish up the servo mount for the front retract when the spring loaded servo arms arrive tomorrow.

I anticipate that the main gear struts will return late in the week. Then this plane can stand on its own landing gear.

Hopefully all of these photos are displayed in the proper order.

Mike Roerig
mikeroerig@gmail.com

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Post #: 111

RE: B-36 build thread and free plans - 4/21/2008 3:57:27 AM

xb36