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Cleveland Models Kit 77.25" ws B-17G 1/16 scale

Old 12-28-2013, 01:38 PM
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reblacklaf
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Default Cleveland Models Kit 77.25" ws B-17G 1/16 scale

Hi, a fellow flyer and I are going to be building a Cleveland Models 1/16 scale B-17 which has a 77.25" ws. We plan on converting it from gas freeflight to electric r/c. Any help on determining power requirements would be helpful as we have never done a conversion before. Most of our builds have been designed for electric power at the start. We plan on the following controls: flaps, ailerons, rudder, elevator, working retracts and bombay. The original plan had the plane covered in silkspan which we plan on doing with sheeting on the nacelles and around the wing root area. We're also planing on using spruce (if we can find it) or basswood for the spars reinforced with carbon fiber. As to power we plan on going brushless @ around 1300 total watts which should be more power than needed. At this time we really have no idea what the all up weight will be. Once we get the supplies and weight the raw wood needed for the project we will make an estimate on weight.

Randy
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Old 12-28-2013, 03:35 PM
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pmullen503
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Hobbyking sells a B-17 of similar size: http://www.hobbyking.com/hobbyking/s...dproduct=17203. That should give you a starting point for AUW and everything else.

I've seen this airplane fly and it flies well, should be a great project.
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Old 05-11-2014, 12:01 PM
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Some time ago a friend of my son and I started a 1/16 scale Cleveland models B-17G kit. We looked at the kit and decided to build from scratch as the balsa was only 1/16 and we were planning on making it a R/C electric. So we have spent 90+ hours cutting 1/8 light ply parts out. We have finished the Stabilizer and sheeted it with 1/20th balsa applied 2 coats of sealer and puttied the low spots. At the moment we are at 3.5oz for this part of the tailplane. Yesterday we dry fit the main wing. We have added an extra exterior rib bay to make it an 85.5" giant scale model. We have a proof of concept for a fowler flap and will add ailerons. Yesterday we dry fit all the main wing parts and it was quite impressive to see the 3d bones laid out on the table. Now to slice the ribs to put in the fowler flaps and the ailerons and we will be off to the races on the main wing.

Astroflight is winding special brushless motors for us and we have modified some 60-120 E-Flight 85 degree retracts to work. The motors will be wired with the 2 inside motors on 1 battery and the 2 outside on a second battery. The servos will be powered with a Castle 25Amp BEC and separate battery. All servos will be digital.

Randy Black

Pictures will be posted and updates added as we proceed if anyone is interested.
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Old 05-17-2014, 06:47 AM
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Well I have to get a hosting site to post pictures, sigh. I will then update where we stand.

Randy
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Old 05-17-2014, 07:20 AM
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The typical issue for pictures is size.
I generally take the photo then load in Paint and shrink to 30%, save as JPG, then they load fine.

I cropped and shrank the photo for my avatar to exactly meet the max allowed size in pixels using the same method.
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Old 05-17-2014, 08:09 AM
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Default Picture post trial

1st image of main wing dry fit.

2nd image of main wing dry fit.

Closeup of main wing ribs.

Mug shot of me holding 3.5oz stabilizer unit.


Randy

Last edited by reblacklaf; 05-17-2014 at 08:23 AM. Reason: picture info
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Old 05-17-2014, 08:30 AM
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Default Materials

We are using 1/8 lite ply for all ribs and formers then lighting them as much as safety allows. As the wing spars are balsa we will be using 1/16 ply for the shear webbing on the front spares out to the second nacelle and then 1/16 balsa the rest of the way. On the back spare we will use just 1/16 balsa. Everything will be covered in 1/20th balsa. I know a flying lumber yard right? Well the finished stabilizer unit comes in at 3.5 ounces.

We are still waiting on the motors from AstroFlight. They hope to have them out to us in the next week. We reversed the E-Flight 60-120 85degree retract layout and are trying to figure out how to wire in our own limit switch so it only retracts to 70 degrees. This way the wheels will lock down and hopefully not having a lock on the wheels up position will not cause a problem. If not we will cant the retract units in the wing so the down position gives the forward position per the original.

I ordered some 1/16 scale 50cals which should be here soon. Our parts bin is getting full of parts for later fitting. A pack of 35 amp Castle multirotor ESC's was ordered and we removed the BEC from the one unit. We will be going with a Castle 25AMP BEC powered by a 2C lipo @ 1350mah for the servos. Main batteries will be 2C lipos @ 5000mah (1 for the inboard motors and 1 for the outboard units).
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Old 05-18-2014, 02:54 PM
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Thanks for sharing your build with us Randy. I look forward to seeing your progress.

Have you decided on a scheme or squadron numbers?

John
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Old 05-18-2014, 03:03 PM
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Originally Posted by max2112 View Post
Thanks for sharing your build with us Randy. I look forward to seeing your progress.

Have you decided on a scheme or squadron numbers?

John
We are doing "A Bit O' Lace". Working on graphics now and will send them off to Calley Graphics for her to make them.

Also decided to try Flite Metal as a covering.

Randy
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Old 05-25-2014, 12:05 AM
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Default Halt in construction

Building has halted for a short time. We are building 2 60+inch wingspan tail dragging trainers to sharpen our flying skills for when we complete the B17 should be back to it next weekend.

Randy
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Old 06-04-2014, 03:22 PM
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Default Airplane Hauler

Well we got to thinking and realized we would need something to haul it around in. My cousin donated a 4x8' tilt trailer that is over 40 years old. We are getting the rust off and building a box to cover it. We will post pictures of this build along with the B17.

Randy
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Old 06-08-2014, 03:45 AM
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Still working on trailer will post pics of the build in next couple of days. Just a short update, the graphics arrived from Calley and Astroflight has shipped the motors. Expecting the motors in this coming week and we can work on the mounting plates for them.

Medical update have to have my right knee replaced so I don't know how it is going to effect our build schedule.

Randy
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Old 06-08-2014, 04:28 AM
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This is what the trailer looked like as we were striping the 40yrs of rust off and rewelding broken welds. You can see the floor subframe under the trailer and tarp made of 2x4.



Randy

Last edited by reblacklaf; 06-10-2014 at 10:18 PM.
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Old 06-08-2014, 04:34 AM
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Here the trailer underside is being primed.



Randy

Last edited by reblacklaf; 06-10-2014 at 10:18 PM.
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Old 06-08-2014, 04:38 AM
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The frame is painted and the bulldog added.



Randy

Last edited by reblacklaf; 06-10-2014 at 10:19 PM.
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Old 06-08-2014, 01:36 PM
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all i got are red x's that don't open up to anything when clicked on.

i like your build,but wow.....you sure do add a lot of extra stuff. i would love to build like that.i can always use more planes in the hanger and a trailer would be fun. i think my wife who's very supportive of this hobby would be rolling her eyes and shaking her head if i added stuff to each build like you are...lol.she would never except my saying "honey,it's a $50 kit.

keep up the good work and i am looking forward to the pictures of the trailer.
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Old 06-08-2014, 03:00 PM
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Originally Posted by tobydogs View Post
all i got are red x's that don't open up to anything when clicked on.
Which pics are red x's maybe I did something wrong when posting. Thanks for the kind comments.

Randy
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Old 06-09-2014, 05:59 AM
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Default Motors

OH, The custom built motors from AstroFlight have been shipped. Should be here this week and we can work on mounting brackets.

Randy
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Old 06-10-2014, 04:14 AM
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Default More work on trailer today.

Shot of floor module loaded and fastened to the trailer just waiting for the box cover.



Bottom of trailer ready for undercoating.



Undercoating applied.



Side shot with sides started.



Front shot with Robb Pfaff in background (He's helping build A Bit O' Lace).



Rear shot where drop gate will go.



We have to hit the junk yards to find some small trailer windows for the front and sides. We will be installing pegboard on the inside and a roof vent with 2 12volt 80mm pancake fans for ventilation.

We have more bracing to do before putting on the top, front and drop gate. Tomorrow will be a short work day so don't know how much will get done as rain is also expected.

Randy

Last edited by reblacklaf; 06-11-2014 at 03:37 AM.
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Old 06-10-2014, 05:08 AM
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randy,you sound like your having a blast putting the trailer together.

does anyone else get only red "x's" where the pictures ought to be,I'm bummed I'm missing out not being able to open them to view. what causes this format? I've seen this before but don't know it is. stu
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Old 06-10-2014, 05:35 AM
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reblacklaf
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Default Red x's

I have no Idea what is causing the problem. Is anyone else have this problem? I use postimg.org to store my images. Can you see the plane pics? Maybe the size is too large.

Randy
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Old 06-10-2014, 11:42 AM
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Randy, make sure you don't have http: twice when you copy past the image location avter clicking the photo icon. Maybe that is the problem??
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Old 06-10-2014, 11:49 AM
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reblacklaf
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Originally Posted by Don Sims View Post
Randy, make sure you don't have http: twice when you copy past the image location avter clicking the photo icon. Maybe that is the problem??
Every thing shows up on my screen.

Randy
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Old 06-10-2014, 06:26 PM
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On my smart phone I only see little squares.
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Old 06-10-2014, 11:55 PM
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Originally Posted by xmech2k View Post
On my smart phone I only see little squares.
Check and see if the pics are there now. I reloaded everything.

Randy
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