Search found 391 matches

by David Jones
February 24th, 2010, 9:29 pm
Forum: Your New Projects
Topic: Zirolli B25 Mitchell build
Replies: 118
Views: 44225

Re: Zirolli B25 Mitchell build

I want to get the bottom sheeting on the wing panels as soon as possible to stiffen them up, but more importantly, to protect the rib trailing edges. Wielding something this size in a confined space does tend to lead to hangar rash. I could start sheeting now, but it would be easier to sort out the ...
by David Jones
February 24th, 2010, 9:27 pm
Forum: Your New Projects
Topic: Zirolli B25 Mitchell build
Replies: 118
Views: 44225

Re: Zirolli B25 Mitchell build

The wing panels are joined by an aluminium tube in a cardboard sleeve, and there are 1/4” dowels at the front and back to keep the structure aligned. The dowels were fitted first. The plans show the wing joiner tube is 1” diameter by 12” long. As these plans are blown up, the tube needs to be at lea...
by David Jones
February 16th, 2010, 7:31 pm
Forum: Your New Projects
Topic: Zirolli B25 Mitchell build
Replies: 118
Views: 44225

Re: Zirolli B25 Mitchell build

I’ve put all three sections together as a trial fit and I am very happy with the results. The whole structure looks true and aligned, and both wing tips are exactly the same height high above the board when measured at the main spar. So, that’s the basic skeleton of the wing completed, the next stag...
by David Jones
February 16th, 2010, 7:28 pm
Forum: Your New Projects
Topic: Zirolli B25 Mitchell build
Replies: 118
Views: 44225

Re: Zirolli B25 Mitchell build

The outer wing panels are pretty much straight forward. The main spar is pinned to the board and the ribs glued onto it. A 1/4” square shim is then inserted under the rear of the ribs, about a third of the way in from the trailing edge, this causes approx two degrees of washout to be built into the ...
by David Jones
February 15th, 2010, 9:29 pm
Forum: Your New Projects
Topic: Zirolli B25 Mitchell build
Replies: 118
Views: 44225

Re: Zirolli B25 Mitchell build

The top spars are then added along with the square leading edge spar and 1/8” false leading edge. I was disappointed to find that a lot of the pre cut notches were not aligned and needed to be re cut and packed. The ribs are cut as per the plan, so it is obviously the profiles that are not accurate....
by David Jones
February 15th, 2010, 9:25 pm
Forum: Your New Projects
Topic: Zirolli B25 Mitchell build
Replies: 118
Views: 44225

Re: Zirolli B25 Mitchell build

It was now time to turn my attention to the wing. Zirolli supplies several A4 pages of building notes with the plans, each step having its own tick box to make life easier. Although not as thorough as a booklet that comes with more popular kits, they are very useful and save a lot of head scratching...
by David Jones
February 15th, 2010, 9:15 pm
Forum: Your New Projects
Topic: Zirolli B25 Mitchell build
Replies: 118
Views: 44225

Re: Zirolli B25 Mitchell build

With the fins and rudders completed, my next task was the tail plane and elevators. The tail plane is of basic construction, but the 1/2” thick tip ribs are short of the end of the trailing edge spar, and are shaped to fit the curvature of the fins. The remaining length of the spar inserts into the ...
by David Jones
February 15th, 2010, 9:09 pm
Forum: Your New Projects
Topic: Zirolli B25 Mitchell build
Replies: 118
Views: 44225

Re: Zirolli B25 Mitchell build

The rudders are built up with a 5/8” leading edge and 1/8” ribs, tapering to 3/16” x 1/2” at the trailing edge, with pre cut profiles for the top and bottom. The plan recommends blocking the trailing edge up on the board, lay sheet balsa in for the ribs and then sand to final shape. I didn’t like th...
by David Jones
February 15th, 2010, 9:02 pm
Forum: Your New Projects
Topic: Zirolli B25 Mitchell build
Replies: 118
Views: 44225

Zirolli B25 Mitchell build

For the past couple of years a small group of us have been talking about building a large model as a joint project. It was discussed numerous times and then shelved, that is until Alan Greaves took the bull by the horns and decided he was going to invest in a B25 Mitchell. I would build the airframe...
by David Jones
January 24th, 2010, 9:43 pm
Forum: General Discussion Topics
Topic: New member
Replies: 4
Views: 2054

Re: New member

Thanks Dave, I do have his 'phone number, we had a chat with him at the Nats when this project was in its infancy, he actually recommended we go for the bigger one. I'll certainly be contacting him in due course once I've got the build registered and started. Does Tony Hooper take registration detai...
by David Jones
January 24th, 2010, 9:17 pm
Forum: General Discussion Topics
Topic: New member
Replies: 4
Views: 2054

New member

Hello LMA. I am a new member and would like to introduce myself. I was a fairly late comer to the hobby, starting in 1990 when, after taking advice I built and was tought to fly a Mascot trainer. Since then I have built numerous models from kits and plans ranging from Super Chipmunks, 1/4 scale Stam...

Go to advanced search