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ZIROLI 120" B-25 MITCHELL

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ZIROLI 120" B-25 MITCHELL

Old 12-23-2011, 01:33 PM
  #1  
samparfitt
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Default ZIROLI 120" B-25 MITCHELL

My Christmas present came in (I love hearing the UPS truck!).

The plans are blown up 101" plans that come from Ziroli (the boxed area says 101")
I measured the wing span and it's really 120 1/4" (hence the title).
I first ordered the gear from Eric at Robart to insure I, first, have the gear and then ordered the parts from Ziroli, online.
Yesterday, I ordered a full kit from PCK, which should arrive next week.
Yesterday, I also called Darrell at Sierra to get B-25 wheels and brakes.
I've got two DA-50's for power.
This build is, probably, for next winter as I should be full with two builds for this winter.
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Old 12-23-2011, 01:34 PM
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samparfitt
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Default RE: ZIROLI 120

rest of the parts.

Presently, I plan on making the center wing removable from the fuse ( I like things to be modular).
Feel free to post pictures and any suggestions from your 120" builds.
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Old 12-23-2011, 02:20 PM
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David Jackson
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Default RE: ZIROLI 120

The Ziroli B-25 was the easiest plane I ever built. It is also the easiest one I have flown.
Old 12-23-2011, 03:20 PM
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STUKA BARRY
 
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Default RE: ZIROLI 120

Every design Nick has flys great. I beleive his big Mitchell is 118 inches, not 120, if you care to split hairs. Good luck with the build. You should'nt have any trouble, all of Nicks plans are tried and true. Doolidles Raiders would make a great paint scheme.
Old 12-23-2011, 03:24 PM
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samparfitt
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Default RE: ZIROLI 120

Dave,
I have to agree with you on building Ziroli as they are very easy to build.

============
Notes:

The instructions say to make the bottom bomb bay removable if the wing is to be removable.
I'll probably make the top hatch removable and, as I did with the B-26, string a 2" wide piece of aircraft ply from the nose gear to the 2nd former back of the wing on both sides of the fuse, since an open bomb bay will make that section of the fuse rather weak.
I like having a top hatch removable so I can add and easily get to the receiver, etc.
The four flaps will have their own servos to eliminate the U wire connection.
I'm partial to short control rods so four servos will be in the tail: two for the rudders and two for the elevator. Chokes will be servo operated.
I want nav/landing lights plus gear/bomb bay doors with bomb drop and a full cockpit and functional top turret.

mmm: noticed the CG says 5.5" but measuring it is 6.5": will have to contact Ziroli on the correct CG.
Old 12-23-2011, 03:26 PM
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samparfitt
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Default RE: ZIROLI 120

Stuka barry,
Probably, the 'blow up' was suppose to be 118" but the plans measure out as 120 1/4".
Center wing is 45 1/4 and each outer wing is 37.5".
The plans were probably 'blown' up before the technology was as advanced as it is today: some parts of the plans have a lot of black (check some of my pictures) along the edges as, today, that wouldn't occur.
Old 12-23-2011, 11:06 PM
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Default RE: ZIROLI 120

We are just finishing our 118-120" Z-B-25. Lot of work but pretty easy. The build went pretty fast, it's the details that slow you down. We have a removable 3 pc wing. bombay is in the bottom of the wing. Also added a doubler over the wing opening with a carbon fiber liner. I added additional bracing just behid the wing in the fuse as the side gun blisters are cut out. More CF. We have rudder and elev servos in the rear but be carefull of weight , it's a long way back there. We also laid CF on the top and bottom spars and around the gear mounts. The gear is a bit shaky so I think we will be replacing struts after a couple flights. We softened the springs a little but the struts are pretty small and the links are not real strong for this size plane. I TIG welded some reinforcing on the links on my Z-Corsair and that solved the weak link problem. It's a tricky weld however. The axels are question mark. 1/4 inch is pretty small for this and i bent plenty of them with the Corsair. Glennis said he would drill out the wheels for 5/16 but we will hav eto tke care of the struts. Another problem waiting for a solution.

We have 2x G-45's for power.. Probably a great over kill but my son likes the power. Robarts with Glinnis wheels and brakes. Full gear doors with sequencing. Double bomb drop, We have the canopy on the tail gun. I cut some vinyl fabric for a scale looking leather enclosure of the tail gun. Looks cool and has real wrinkles. There is a mile of air lines with the sequencing all color coded. The wire is very significant too. We actually ripped it all out and re-did it without connectors where ever possible. crimp and solder. Just one connector coming apart in flight can ruin your day.

This one is OD on top and light gray on the bottom. I think we will have invasion stripes too. So far we have deleted the 20mm side guns as they didn't look right.

Target weight is 50 pounds but 54 looks more realistic. We have lots of batteries and backup stuff. The gear doors were not real hard just hard to get small gaps. I decided to make copper tubing exhaust, it's pretty simple and does not weigh a lot. I TIG welded it so it looks cool. It's close to scale too. We were going to have operational cowl flaps but that was jus too complicated. We have the small flat wide scoop on the top of the cowls. It took a day each for me to mold them and get a scale sharp edge on them but they do look very nice.

4 servo flaps and servos on each aileron, servo on each motor, retract require 2 servos and mixing. My son did that so I really don't know how it works but it does nicely. the electric switches are under the top turret. Motor switches are on each cowl. It looks like 18-10 3 blades will work. We still have fuel tanks to install somewhere. It's tempting to weld up an aluminum tank sculptured to fit in the fuse feeding both motors. For a big plane you would think there is a lot of room but that is not the case.

This is it in a nut shell.
Good luck on your build.
Old 12-24-2011, 03:40 AM
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samparfitt
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Default RE: ZIROLI 120

Bentwings,
I like lots of info: thanks.
I hear ya' on those axles: I've bent mine on the P-61: good idea on enlarging them (hadn't thought of that). I'm hoping the gear is sturdy: it appears to be the same quality as my P-61 and those have held up extremely well. One nice thing is the double air cylinders on each gear.
My kit is on the way but it's probably lite ply for the wing saddles, so I'll re-cut them with aircraft ply and, as you did, double them and glassing those areas.
I also hear ya' on additional support on the fuse to the nose gear and behind the wing: I did the same on my P-61 and will do the same on the B-25: without that additional support, I can see that nose or tail breaking off on a hard landing.
I usually add another inch to my motor mounts to extend the engines out farther: no one notices it and it helps to keep nose weight down on my warbirds.
My DA-50's are over kill but it's what I have as spare engines. My P-61 has G-62's and it's been clocked at 126 MPH.
I make all my extensions using 20 gauge wire and has worked well on the tons of wire in the P-61. With all those long wire runs, the heavier gauge wire definitely helps.
I'll keep tabs while building the nacelles for room: I'll use a bolt on firewall so I can get the tanks into the nacelles.
I was hoping that they had FG parts for those air scoops over the engines but no such luck!
Again, thanks for all the good info.
Old 12-24-2011, 05:13 AM
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bentwings
 
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Default RE: ZIROLI 120

We cut our own kit after returning 2 semi kits. The parts just did not match the plans. I think something was lost in the blow-up. We also replaced a lot of the lite ply with AC ply as you noted. I'm glad to hear the gear legs are holding up. The Glinnis wheels are really heavy and they surely take a lot of force to get up to speed when landing. We used a bolt on firewall too for the same reason...works great.

We have plans for a P-61 too but we are about out of room. I have a 34 foot goose neck trailer so transportation is not a problem but at my son's house the shop is getting full.

I lost a lot of my pictures of these in a computer crash but I'll get over and take some shortly.

That's really fast for the P-61. Probably pretty close to dynamic scale however. If you get over to Owatonna in 2012 we may get a chance to meet.
Old 12-24-2011, 05:36 AM
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IFLYBVM2
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Default RE: ZIROLI 120

Hi Sam-I love hearing the sound of a truck also, but in my case it was motor freight ! Santa dropped off the 'ARF' version of what you are building: It's the 2009 Top Gun Expert class winning Ziroli 118" B-25. Proud to have it now residing in my hangar. Must give credit to Greg Hahn, the original owner and builder of this masterpiece. Certainly made my Christmas !
-Mike Oberst
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Old 12-24-2011, 06:03 AM
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STUKA BARRY
 
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Default RE: ZIROLI 120

Yawl got it goin on, I luv um BIG. If you can arrange it, you need to be at Warbirds Over Delaware in July, the premier warbird event. They fly um big there, its quite a site to see and participate in. They would luv to have you attend.
Old 12-24-2011, 06:09 AM
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samparfitt
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Default RE: ZIROLI 120

Bentwings:
To store all my stuff, I've resorted to stacking them.
Thanks for the 'heads up': I'll have to dry fit all the formers/ribs before gluing to insure all is aligned. I've been pretty happy with PCK: I haven't had any troubles with their kits.
Owatonna and Fond Du Lac are, permanently, on my 'road trips': those and Muncie are my 'high water marks' for the year.

Mike,
You lucky dog.
I was over his house last year: saw it without engines. Didn't know that he was selling it or I would have 'scarfed it up'.
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Old 12-24-2011, 06:17 AM
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Default RE: ZIROLI 120

Sam,

Not to get off the B-25 subject, but what are your two builds this winter. Loved the Dauntless and Hellcat from last year.

Wild Bill
Old 12-24-2011, 06:25 AM
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samparfitt
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Default RE: ZIROLI 120

Bill,
Presently, I've got a thread on the Bates B-26 and then I'll do the Ziroli P-40 (thread also started).
Old 12-24-2011, 06:27 AM
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samparfitt
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Default RE: ZIROLI 120

Bentwings,
I lost my pictures 3-4 years ago: now I have two hard drives and once a month, I copy the files from the main drive to the secondary drive. An extra drive doesn't cost much and the procedure, each month, is easy.
Old 12-24-2011, 10:10 AM
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Default RE: ZIROLI 120

2 mates of mine are just finishing the build on this model, its now in primer, the zenoah 38s are going to get run next week, there is a full build thread on the large model associations forum, if you want a link, just holler
Old 12-24-2011, 12:07 PM
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samparfitt
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Default RE: ZIROLI 120

LMA B-25 build:

http://www.largemodelassociation.com...php?f=9&t=1149
Old 12-24-2011, 01:46 PM
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Default RE: ZIROLI 120

Sam,
Thanks, I learned my lesson. I now have a portable HD and 2 8 gig sticks. I have couple huge chips for my camera too. There are over 1k picture still on my camera from everywhere this year. I have to clean house one of these days.
Old 12-24-2011, 08:01 PM
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Default RE: ZIROLI 120

You Sir, are a very ambitious builder.
Old 01-13-2012, 01:05 PM
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samparfitt
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Default RE: ZIROLI 120

PCK full kit arrived.

20 lbs of wood (counting the two boxes).
I also got some aircraft ply from BalsaUSA to re-cut those parts that the plans/instructions say are to be aircraft ply.

I'll probably begin construction some time during the summer after the B-26 and P-40 are done.
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Old 01-13-2012, 01:22 PM
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Default RE: ZIROLI 120

Hi Sam,

Good catch on the CG shown on the plans. I scratched my head a little when I built mine.

If you multiply 5.5 inches times 118 percent, you get 6.49 - so the 6.5 inches is correct. I had G-45's on mine and it was a rocket ship Good luck with your build !
Old 01-13-2012, 01:27 PM
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ROGER RUSSELL
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Default RE: ZIROLI 120

Sam:
How much does a box a sticks like that cost to get cut?
See you this summer.
Old 01-13-2012, 01:41 PM
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samparfitt
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Default RE: ZIROLI 120

Jpate:
thanks for the CG info: I forgot to call Ziroli about it.

============
Roger:
$525 plus 40 bucks for shipping.
I'm ready for summer!
It was pretty warm here but now is in the teens: Didn't get hit by snow like up north, just a dusting, here in Cincinnati.
Old 01-13-2012, 02:24 PM
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Default RE: ZIROLI 120

Sam,
Be sure you check the part fit to the plans. We went thru 2 cut kits with just big mess of ill fitting parts. We finally bought another set of plans just to use to cut parts. As you get into the inspection I sure you will see many areas to replace the lite ply with AC ply.......what am I doing tell a pro builder how to do this?? haha

We are just finishing ours. All that is left is to finish the scale exhaust system and pait the cowls. We are at 51 pounds with NMH batteries.

Flash!! a spider... looks like a brown recluse has invaded our cockpit and is building a web. We can't remove the canopy now. Considering a centipede exterminator.
Old 01-13-2012, 02:41 PM
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samparfitt
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Default RE: ZIROLI 120

thanks for the heads up, bentwings.
I usually, dry fit everything, before any gluing.
I've had good luck with PCK on my builds.

post some pictures of that baby!

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