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Old Aug 17, 2007, 08:44 PM
BYOP - Build Your Own Planes
Mountain Models's Avatar
United States, WI, Appleton
Joined Mar 2001
1,724 Posts
Build Log
Mountain Models Switchback Sr. Now Available

The SwitchBack Sr. is now available on the web site here:

http://www.mountainmodels.com/produc...roducts_id=522

BASIC SPECS:

Wing Span: 54 in.
Wing Area: 597 sq. in. (4.15 sq. ft.)
Length: 40 in. (back of tail to front of prop nut)
AUW: 34-37 oz. (33.2 oz for one in pictures below)
Power: Scorpion 3008-32, 25-35A ESC, 3S-2000 LiPo (Pictured model flown at NEAT)

PRICE: $109 for the first couple of weeks.

PROJECTED RELEASE: Pre-Production kits were released at NEAT Fair, 2007. Kits will be available on the web site NOW!

Brian
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Old Aug 17, 2007, 09:13 PM
BYOP - Build Your Own Planes
Mountain Models's Avatar
United States, WI, Appleton
Joined Mar 2001
1,724 Posts
Pictures of TurboJoe's Beta kit at the flying field here:
http://www.rcgroups.com/forums/showt...729477&page=15

Video of TurboJoe's flight here:
http://www.rcgroups.com/forums/showt...729477&page=16

Pictures of the "photo" model at NEAT:
http://www.rcgroups.com/forums/showt...729477&page=22
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Old Aug 17, 2007, 09:15 PM
BYOP - Build Your Own Planes
Mountain Models's Avatar
United States, WI, Appleton
Joined Mar 2001
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Place Holder
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Old Aug 17, 2007, 09:30 PM
Obviously I'm a "Minus Member"
buzzltyr's Avatar
USA, MA, Longmeadow
Joined Jun 2003
1,836 Posts
Quote:
Originally Posted by Eberwein
This will be the "official" thread for the BETA builds of the Mountain Models Switchback Senior.

I'll update this first post as time goes on and after the plane is released with all the updated information.

Basic Specs:

Wing Span: ~55 In
Wing Area: ~598 Sq In
Length: ~40 In. (back of tail to front of prop nut)
AUW: ??? We'll see how the Beta's come out.

Brian
YeeHaw! 'Bout darn time! Looking forward to the beta builds, and the final kit!

Mark
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Old Aug 17, 2007, 11:51 PM
AMA# 851123
brucea's Avatar
Bailey, CO
Joined Apr 2006
1,540 Posts
SB SR Vertical Stabilizer and Rudder

Hey Guys,

A Switchback Senior beta kit landed on my door step this afternoon. I spent a few enjoyable hours fiddling with the SB Senior after dinner. First, this kit has very nice interlocking parts. I built the vertical stabilizer and the rudder. I have a few observations:

(1) There are two 0.20" (about 3/16") balsa sheets with the parts for the vertical stabilizer, horizontal stabilizer, rudder and elevators.
(2) Near the edge of both 3/16" sheets there were some parts that were nearly cut through, but not quite. This really causes no difficulty. All the other parts "pop" out with no problems.
(3) The parts dove-tail together perfectly making assembly easy. However, I had some minor breakage on one joint on the vertical stabilizer. This was caused by a "dry fit" then trying taking the joint apart. I found out that by dressing the female side of joint with a sanding block, prior to assembly, that the parts could be "dry fit" and taken apart very nicely without breakage.

Note: The parts fit so well that once you have pressed the parts together, it is difficult to take the dry joints apart. This is going to take me a bit of getting used to. But I like it!

(4) I found that a solid flat surface really helps when pressing the parts together. I am using glass.
(5) The airframe looks very, very strong.
(6) This plane is very fun to build.
(7) Hitec HS-81 Servos are a perfect fit!

Thanks, Bruce
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Old Aug 18, 2007, 12:48 AM
BEC
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Auburn, Washington USA
Joined Jan 2001
12,940 Posts
....and so it begins .
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Old Aug 18, 2007, 11:36 AM
Balsa to the Wall
Deep in the East Texas Piney Woods
Joined Dec 2001
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Hurry UP!!!


Chuck
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Old Aug 18, 2007, 11:38 AM
AMA# 851123
brucea's Avatar
Bailey, CO
Joined Apr 2006
1,540 Posts
Horizontal Stabilizer and Elevator

Ok Guys,

This build of the Switchback Senior is extremely fun! When production kits are available, buy one just to build it! Once I got the hang of the unbelievably tight fit of the parts, this plane is going together fast! All I can say is WOW! Even for a beta, this is one sweet kit! I have checked each sub-assembly for squareness. The interlocking parts make it near impossible to mess-up the tail feathers! The parts are marked on the 3/16" balsa sheets: "V" for Vertical Stabilizer; "R for Rudder; "E" for Elevator; and "H" for Horizontal Stabilizer. If you get the right part for each sub- assembly, you cannot put a part in a wrong position. If it does not fit, you have a part for a different sub-assembly!

After breaking a few corners off of the Vertical Stabilizer after when trying to take the "dry fit' apart, I have developed a method of just sort of laying the parts on each other to make sure I have the right parts in the right places. Once the parts are pressed together, the fit is so precise, that just a dab of thin CA is all that is required.

This is a very sophisticated kit.

Thanks, Bruce

P.S. Brian, It looks as if the elevator joiner is missing from my beta kit.
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Old Aug 18, 2007, 12:45 PM
M0unt@in M0del$ minion
turbojoe's Avatar
United States, AZ, Mesa
Joined Jul 2002
7,320 Posts
What I picked up at the post office was not the SwitchBack kit. Maybe it'll come in todays mail.

Mike brought me a Scorpion 3008-32 motor this morning so that's what I'll be using in my build since Brian sells Scorpion motors (not the 30mm yet).

Joe
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Old Aug 18, 2007, 01:50 PM
BYOP - Build Your Own Planes
Mountain Models's Avatar
United States, WI, Appleton
Joined Mar 2001
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Yeah, there's going to be a few things missing. But that's why I chose the guys I did, they can "wing it". The elevator joiner is as you thought it was.

Once you put those tail parts together and press thyem into place, there's no taking it apart without breaking a dovetail or something. If anyone thinks it's too tight, let me know.

Still working on getting some pictures. The camera died a mysterious death, so I need to go buy a new one today. It's still in warranty, but I just can't wait for a replacement to show up. The show MUST go on!

Brian
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Old Aug 18, 2007, 02:15 PM
AMA# 851123
brucea's Avatar
Bailey, CO
Joined Apr 2006
1,540 Posts
Quote:
Originally Posted by turbojoe
What I picked up at the post office was not the SwitchBack kit. Maybe it'll come in todays mail.

Mike brought me a Scorpion 3008-32 motor this morning so that's what I'll be using in my build since Brian sells Scorpion motors (not the 30mm yet).

Joe
Dear Joe,

I hope you get your Switchback Senior today. With no plans, nor instructions, I am going to need all the help and collaboration I can get! I am fiddling around with the wing right now, which is like a 3D jigsaw puzzle! This is going to be a superb airplane! This Switchback Senior is raising the bar!

Thanks, Bruce
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Old Aug 18, 2007, 02:21 PM
A Clinger
rclark's Avatar
Butte, MT
Joined Sep 2001
7,075 Posts
Watching ... and subscribed .... so do a good job . Looking good so far.
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Old Aug 18, 2007, 03:00 PM
Promoting Model Aviation...
Murocflyer's Avatar
United States, CA, Tehachapi
Joined Nov 2005
25,456 Posts
Quote:
Originally Posted by rclark
Watching ... and subscribed .... so do a good job . Looking good so far.
Ditto. Nice work so far Bruce. I'm guessing no issues so far huh?

Thanks for the size comparison. Would like to see more dimension callouts when possible.

Thanks,

Frank
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Old Aug 18, 2007, 05:49 PM
The Evil Twin
Garden City, GA
Joined Feb 2004
1,308 Posts
(Quote) The show Must go on!
Great work Brian! And Doug. This looks like one sweet plane.
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Old Aug 18, 2007, 07:06 PM
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Lubbock, Texas, United States
Joined Jul 2003
975 Posts
Bruce:

You mentioned the little "slots" on the wood left from laser cutting. Let us know if any of those show up on a joint any where. That is a "pet-peave" of mine that I have seen somewhere with another laser cut kit. Don't remember where. It's OK, just a little annoying and unnecessary. A well cut kit will go together lightning fast!

Very nice so far! Keep it going and lots of pictures are nice!

Bryan
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