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Ed's Ziroli B-25 Build

Old 02-12-2013, 11:38 AM
  #51  
Prekin
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Default RE: Ed's Ziroli B-25 Build

Hi bigE,
I see, your build 101" B-25. Maybe you wrote it some time ago, because I read, some row about the engine, but my english is not very good, so what engines you want to use for your Mitchell?
One question for all. Does anybody know about some good plan for the B-26?
Thank you.
Old 02-12-2013, 01:31 PM
  #52  
samparfitt
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Default RE: Ed's Ziroli B-25 Build

B-26:
http://www.rcuniverse.com/forum/m_10...m.htm#10721852
Old 02-12-2013, 05:09 PM
  #53  
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Default RE: Ed's Ziroli B-25 Build

Big Ed. This is a customer build. The customer wanted inexpensive 35cc gas engines, so he got NGH 35's. This is probably overkill and 25cc engines would have been fine. The L.G. is CJM. It dropped right into place. I'll post pix as soon as I get a chance. I've got a really busy build schedule at this time of year. John R.
Old 02-12-2013, 05:39 PM
  #54  
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Default RE: Ed's Ziroli B-25 Build


ORIGINAL: Olsen

Hello

Nice build you have going here, good to see that others still want to built this nice plane, I have just been trough the same the last 7 months with the 118 inch version, I have had the 101 inch version and it is a great flier. I was so stupid to sell it off to a fellow modeler but on the other hand it then gave me the opportunity to built a new one and this time the big brother.
I did actually glue the w-8 in place and finished of the complete center section and then I adjusted the fit on the outer wing when I built that.
Good luck with your build here is a link to some photos of my build [link]https://picasaweb.google.com/111994526239439977373/ZiroliB25JMitchellPanchito#[/link] and a couple of small photos of the model almost completed I am only missing to put in the fuel tanks and to make the header pipes for the mufflers.
Henrik,
Your plane looks absolutely amazing. I think I saw a video on youtube of your 101" bird. In fact- seeing your plane fly sealed the deal on my decision to build this plane. Thanks for the link to your pictures. I am finding with this build that sometimes a picture is worth a thousand words!
I decided to heed your advice and glue in the W-8.. More to follow-
Old 02-12-2013, 05:47 PM
  #55  
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Default RE: Ed's Ziroli B-25 Build


ORIGINAL: Termites Dream

Ed, wish mine looked as good as yours at this point I glued W8 and then adjusted the adjacent rib in the outer wing panel to match W8. You can do this when you glue in the plywood washers (donuts) so the outer wing panels have the right amount of droop.
The rear of 5 and 7 sucks. I had to break and readjust a couple of them later to make the right fit. The back part of the nacelle is not really scale anyway, as Sweeper pointed out, it is too oval rather than being more round in the full scale. But you wont notice it unless you are competing in top gun.
I am still waiting on Robart, they are holding me up!

David
David-
I appreciate the compliment because I find myself somewhat embarrassed to post some of the pics because I wish my workmanship was as good as some of the others Ive seen.
I am looking forward to your report on the electric retracts. I decided I wont purchase mine until then- Maybe the extra 200 will be worth not dealing with air lines and loss of air pressure at the most inopportune times.
Old 02-12-2013, 05:51 PM
  #56  
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Default RE: Ed's Ziroli B-25 Build


ORIGINAL: smkrcflyer

Subscribed, my next builds will be a BT Spitfire and Ziroli PT-17 so I’m looking to learn all that I can.
Im glad people are interested in this because I am enjoying sharing the build. Motivates me to keep building!
Old 02-12-2013, 06:32 PM
  #57  
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Default RE: Ed's Ziroli B-25 Build

After reading all the posts today I decided to go ahead and glue W-8 in place. In my last update I showed my makeshift jig to try and keep the rib straight and vertical .... I modified it a little.
The rib had a slight bow (warp) to it and no matter how careful i am, (as I have learned in the past) there will be a gap somewhere on the joint between the two wing panels. So I had clamped a piece of angle aluminum to the rib. This kept the rib straight as an arrow, but made aligning everything a major pain in the butt. So I had a brain storm today at work.
If I glued a piece of light 1/4sq down the long axis of the rib while holding it perfectly flat on the table, it should then keep that perfect flat shape. so I gave it a shot.
Worked like a champ. I made a small notch in the spar so it would fit, (1/4 sq is glued to the inside of the rib as you can see in the pics), laid my large piece of angle aluminum on the plans even with edge of W-8, and then used the triangles to square everything up. You can also see the small piece of angle aluminum I used on the trailing edge to verify and hold all rib trailing edges on the same plane. Used 30 min epoxy on this rib to ensure it was plenty strong and that i had time to line everything up. Very satisfied with how it came out. Once i get the bottom sheeted, I will go back and clear the wood from the wing tube hole. Nobody will ever know its there!
Last pic is my extra 300 I just finished building from Model Aviation plans I got back in 2004. Totally different construction techniques, but it gave me the courage to tackle the B-25.
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Old 02-12-2013, 07:26 PM
  #58  
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Default RE: Ed's Ziroli B-25 Build


ORIGINAL: Prekin

Hi bigE,
I see, your build 101'' B-25. Maybe you wrote it some time ago, because I read, some row about the engine, but my english is not very good, so what engines you want to use for your Mitchell?
One question for all. Does anybody know about some good plan for the B-26?
Thank you.
Im considering using the OS GT33, just worried it might be too much. But I like the idea of swinging a bigger prop and cruising at lower RPM's.
Old 02-14-2013, 06:41 AM
  #59  
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Default RE: Ed's Ziroli B-25 Build


ORIGINAL: bigE


ORIGINAL: Prekin

Hi bigE,
I see, your build 101'' B-25. Maybe you wrote it some time ago, because I read, some row about the engine, but my english is not very good, so what engines you want to use for your Mitchell?
One question for all. Does anybody know about some good plan for the B-26?
Thank you.
Im considering using the OS GT33, just worried it might be too much. But I like the idea of swinging a bigger prop and cruising at lower RPM's.
Ed,

one thing I remember now that they told me when I talked to the guys at Ziroli was ground clearance. Make sure you have enough ground clearance with that bigger engine/prob combo. 3 blade might help.

David
Old 02-14-2013, 05:34 PM
  #60  
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Default RE: Ed's Ziroli B-25 Build

Not trying to steal anyones thread, built ziroli 101" myself great plane. G38's for power worked out really good, haven't flown yet but hope this is the summer for the maiden. Used several of FlyinLindys ideas. Got the exhaust stacks for the cowls from him, great guy!!
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Old 02-14-2013, 06:49 PM
  #61  
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Default RE: Ed's Ziroli B-25 Build


ORIGINAL: MarvinLoomis

Not trying to steal anyones thread, built ziroli 101'' myself great plane. G38's for power worked out really good, haven't flown yet but hope this is the summer for the maiden. Used several of FlyinLindys ideas. Got the exhaust stacks for the cowls from him, great guy!!
Hey, feel free to post as many pics as you want! Your plane looks fantastic!
Old 02-15-2013, 04:14 AM
  #62  
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Default RE: Ed's Ziroli B-25 Build

Hello

Thanks for the nice words about my "Panchito" , it is covered with fibreglass 3/4 oz. and Zap finishing epoxy (Very easy to work with) and the aluminium is from Mick Reeves in the UK it is called Metalcoat [link]http://www.mickreevesmodels.co.uk/~mickreev/Access/accessories.htm[/link] it has a very very strong glue on the backside,I have polished it with some stuff called Autosol especially made for aluminium. My rudders and elevators are covered with fabric too it is this [link]http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXB195[/link] it has almost the same colour as the aluminium but on the real plane you can actually see the difference too.

I think the 101 version can easily fly on 20 to 26 cc gas engines I flew mine with two OS 120 Fourstroke Glow engines with pump and it was actually plenty of power but today I would have chosen gas engines too, they are more cheap to run, less oil, and no messing with nitro and so on.

Here is a short video of start up take off and landing great flier this model.

[youtube]http://www.youtube.com/watch?v=Iu1AQkf7nNU&list=FLAhckQK3q6gB0GNZv5EwaNQ&index=12[/youtube]

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Old 02-15-2013, 05:42 AM
  #63  
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Default RE: Ed's Ziroli B-25 Build

Question for all: where do you get your one eighth scale pilots? I like Best pilots except the cost really adds up on a bomber. $100-125 painted, $45-65 if you feel like an artist. Any cheaper alternatives out there for painted pilots?

Henrik, thanks for the info, I would love to do the silver if I can make it work.
Old 02-15-2013, 07:22 AM
  #64  
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Default RE: Ed's Ziroli B-25 Build

I have used these from Century Jet.

http://centuryjet.com/index.php/cPath/46_38_36
Old 02-15-2013, 01:53 PM
  #65  
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Default RE: Ed's Ziroli B-25 Build

Hello

My pilots are from CJM too
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Old 02-15-2013, 04:53 PM
  #66  
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Default RE: Ed's Ziroli B-25 Build

Henrik, Where did you get that 3-1/2" spoked metal nosewheel? John R.
Old 02-15-2013, 10:33 PM
  #67  
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Default RE: Ed's Ziroli B-25 Build

And the build continues.....

First had to glue on the W-8 on the other side. Again, the angled aluminum comes in real handy with a few cheap triangles from home depot. Im hoping the effort will give me a nice gapless joint when I'm done.
Once that was done I flipped her up and added the remaining spars to the bottom. I used this opportunity to prep the ribs with the flaps so they will be easier to cut later on.
Next I made the skins for sheeting the bottom of the wing. I carefully blocked up the wing so that while i was adding the skins I didn't inadvertently build in a warp. There is still one more skin to add to the bottom, but Its been a long day and I need to get some sleep!
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Old 02-15-2013, 10:39 PM
  #68  
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Default RE: Ed's Ziroli B-25 Build


ORIGINAL: Termites Dream


ORIGINAL: bigE


ORIGINAL: Prekin

Hi bigE,
I see, your build 101'' B-25. Maybe you wrote it some time ago, because I read, some row about the engine, but my english is not very good, so what engines you want to use for your Mitchell?
One question for all. Does anybody know about some good plan for the B-26?
Thank you.
Im considering using the OS GT33, just worried it might be too much. But I like the idea of swinging a bigger prop and cruising at lower RPM's.
Ed,

one thing I remember now that they told me when I talked to the guys at Ziroli was ground clearance. Make sure you have enough ground clearance with that bigger engine/prob combo. 3 blade might help.

David
David-
I was thinking a 16-10 three blade but looking at the plans, an 18" 3-blade would easily clear the fuse and be about 2.5" off the ground.
Old 02-16-2013, 02:00 AM
  #69  
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Default RE: Ed's Ziroli B-25 Build

ORIGINAL: Olsen

Hello

My pilots are from CJM too
Henrik, nice painting on those guys. Century Jet does not have one eighth pilots, did you and Tevans use the one seventh or one ninth? Thanks.
Old 02-16-2013, 02:50 AM
  #70  
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Default RE: Ed's Ziroli B-25 Build

Hello

My pilots are 1/6 and the two guys in the cockpit are actually British pilots but I got a good deal on those here in Denmark so I thought they were ok to put in, the guy in the nose is an american pilot. I had to cut a little of their feet to make them fit into the plane but you can hardly see it from the outside.
My nosewheel is actually a 4 inch 8 spoke alu wheel from Robart in fact I bought the complete landing gear, wheels and airtanks,valves and so on directly from Robart at their homepage. I had a vey good experience dealing with them good service and they delivered everything in a very short time.[link]http://www.robart.com/[/link]

Ed your work is very nice to follow it looks as if you are taken the time it takes to make everything aligned and done in a proper way so keep up the good work, you will be very happy with this model, and if it is built carefully it will reward you with fantastic flying performance it has no bad habbits at all.

Hope it is ok that I am answering some questions in your thread.
Old 02-17-2013, 10:57 PM
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Default RE: Ed's Ziroli B-25 Build

Made some good progress this weekend. First on the agenda was to finish sheeting the bottom of the center section. Pretty straight forward. I wound up cutting new trailing edges for the W-5's and 7's since it looks like after looking at the plans I cracked them in the wrong spot. I will add them and the flap ribs later. Next up are the outer wing panels.
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Old 02-17-2013, 11:08 PM
  #72  
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Default RE: Ed's Ziroli B-25 Build

Building the outer wing panels is pretty easy once I figured out the arrangement of all the spars. Started off by laying the 1/4"sq over the plans which I guess builds in some washout. I didnt glue the inner rib W-9 (which mates to the center section) so that way I can get a nice tight fit as I align the wing panels.

I do have a question if anyone wants to take a stab at it- Once the panel is done and I take it off the table, its still pretty flimsy and easily warped. It looks like I am supposed to sheet the bottom first- how on earth do I keep from warping it as I put the sheeting on if I sheet the top first without the use of the 1/4sq on the board? I am sure the answer is simple, but I'm just not seeing it.
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Old 02-17-2013, 11:29 PM
  #73  
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Default RE: Ed's Ziroli B-25 Build

Now that the outer panels are framed up I started the process of fitting them to the center section. I set the center section back on the building board over the pans such that I can work on the entire assembly at once. For the wing tubes, I will use tube sleeves in the center section while the aluminum tubes themselves will be permanently epoxied in the outer panels.
For the first trial fit, the center section tube holes were a snug fit and the tubes exited the center section nice and level. So in order to adjust the droop of the outer panels, (1/4" at the wing tips) I enlarged the outer panel tube holes and cut snug fitting "donuts" that will be used to epoxy the tube in place once the wing panel is aligned perfectly. To get that 1/4' measurement, I placed my long piece of angle aluminum across the high points of the center section extending out to the wingtip. As you can see in the last picture, even with the tube holes in the outer panel enlarged, I am still nearly an inch off. So tomorrow I will take it back apart and open the holes up a little more to get the 1/4" measurement.
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Old 02-18-2013, 03:59 AM
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Default RE: Ed's Ziroli B-25 Build

Great workmanship. I'm subscribed.
Old 02-18-2013, 08:34 AM
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Default RE: Ed's Ziroli B-25 Build


ORIGINAL: dondurrua

Great workmanship. I'm subscribed.
Glad your following Dad!

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