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Member postings for Broken Prop

Here is a list of all the postings Broken Prop has made in our forums. Click on a thread name to jump to the thread.

Thread: Flair ?
11/02/2019 21:35:44

Thanks also Kevin, not for the heads up on the Pup, but on that page I spotted the Tiger Moth refurb kit.

I have been looking for that for months!

Thread: Flap Servo Set Up
26/01/2019 06:23:17

Hi Bob

Model Radio Workshop in the UK do a nice servo slow. Go to www.modelradioworkshop.co.uk

Pete

Thread: New year
31/12/2018 10:06:24

Start a new build next week but this time get it finished in time for the flying season, without getting distracted half way through by newer and more tempting projects. Perhaps I should stop reading RCM&E in the interim!

Thread: Cutting steel wire
12/12/2018 09:43:38

The easiest way to cut a Bowden cable inner is to use a hammer and sharp chisel. Cuts clean as a whistle with no frayed ends.

Back in the day we used to cut brake cables this way. It is a lot cheaper method than than using specialist cutters!

Thread: Reach for the sky
25/11/2018 19:45:13

Sat and watched the film in bits whilst waiting for glue to dry. i loved the Hurricanes (often shown in close-up) which were really war weary. Oil stains and paint chips everywhere.

Great weathering fodder for the scale boys!

Thread: Civil Engineering advice needed
14/11/2018 13:40:58

Erf you are quite right about the builder taking a short cut with the patio works. External finishes are the last thing to be done on a contract by which time the builder is chafing for his money and wants to finish the job quickly. The built up area is also a good place to get rid of some of the general rubbish that accumulates around all building works.

The architect rarely specifies external works in detail and as David quite rightly says, the works get skimped as a result. David is also quite right about the failure of retaining walls, which nearly always fail by leaning outwards. The mechanism is as follows:

During the summer the fill behind the wall dries out and shrinks, opening up a crack between the fill and the wall. Dust and dirt falls into the gap and during the winter the fill gets wet and swells. Because the gap no longer exists, the swelling of the fill exerts a pressure on the back of the wall. The following summer the same thing occurs and over the years the increasing pressure gradually pushes the wall over. Retaining walls on clay subsoils are particularly vulnerable to this action and I have lost count of the number that I have condemned over the years!

However it does take a long time.....

14/11/2018 12:15:49

Hi Erfolg

The problem that you have is quite common and is caused by long term consolidation of the fill material behind the retaining wall. The area immediately behind the wall is the deepest part of the fill and this will consolidate more than areas close to the house (assumimg that originally the ground sloped up towards the house).

The fill was clearly not laid properly and is in a loose condition, hence the subsequent consolidation. The proper way to lay fill over about 600mm in depth is to lay 225mm of fill, consolidate and then cover with 150mm of very wet concrete, which partially flows into the fill and binds it together. Repeat until the required level is reached.

Short of digging it all out and doing that, whatever you do will only be partially successful as the fill below the level at which you are wotking will continue to consolidate over the years. However your current approach is good and I would suggest that if you wish to do the work yourself, you continue more or less as you have been doing.

I would suggest however that you bed the flagstones on 50mm of soft sand, which makes them easy to level and also to re-level when they inevitably subside in the future. You will no doubt have noticed that the council use this method to lay pavements and that is why they do it.

Do not be tempted to cement between the flagstones as the joints will only break up in the future as the patio continues to move. Instead trickle silver sand into the joints and repeat from time to time. (It makes weeding easier too).

Good luck with the work! Long term consolidation is a pain to deal with effectively!

Pete

Thread: Tony Nijhuis Harvard - Build Log
11/11/2018 21:31:51

That is coming on nicely Geoff. Looking forward to seeing it in the air!

Pete

Thread: Majestic Major (electric) build.
08/11/2018 18:16:52

'Imperial Major?'

I like the sound of that as it reflects the conservative stiff upper lip Britishness of the design. After all, when the original was penned we still had an an Empire, (well sort of).

wink

07/11/2018 13:42:31

I use the same method as Don to fix the wheels on all my vintage models. The only difference is that I fit an 'R' pin instead of a split pin.

My wife says I am always 'arpin on.......

I'll get my coat.

Thread: Home DIY
06/11/2018 20:40:45

Gary, as advised, drilling into a Catnic pressed steel lintol can be done with cobalt twist drills. However it is difficult to get a twist drill to start cutting in steel so a good tip is to use a lathe centre to drill a small hole first. A lathe centre forms a countersunk hole with the taper at a steeper angle than a twist drill. This allows the latter to bite and get started.

If it is an RSJ or possibly a Structural Hollow Section, these are made from high carbon steel and just laugh at normal drill bits. Buy a broach cutter (lots for sale on ebay), which is what steel fabricators use. Broaches tear into structural steelwork like a knife into butter.

If the member is a structural steel section you will not be able to get a screw to bite into it as the steel is too tough for the screw to form a thread. However you can tap the hole to take a small bolt.

Good luck!

Pete

Thread: Majestic Major (electric) build.
05/11/2018 20:30:37

Thanks for sharing this build with us David. I am an avid subscriber now. Truly a masterclass!

I particularly enjoyed your sub-thread on wire bending and the use of registration marks. Much better than the 'looks about right' approach that I normally adopt.

More please!

pete

Thread: Puller for a prop driver
21/10/2018 22:25:09

Thanks for the pointers guys! It looks a nice bit of kit so I'll get one.

P

21/10/2018 14:43:17

Hi Guys

I need to get the crankshaft out of a Saito 30 but the prop driver is very tight. Does anyone know where I can buy a small puller suitable for this job?

Thanks in advance

Pete

Thread: When modelling money saving goes too far...
03/10/2018 21:00:32

A dear old friend of mine, now sadly departed, was an aeromodeller of the old school. He quite liked the switch from razor blades to scalpels, but kept a small oil stone on the bench with which to re-sharpen them.

When I first heard of this I thought it amusing, but guess what? I do the same thing now!

Thread: Depth Perception.
27/09/2018 09:37:40

You have my sympathy David. Many a time I have landed on the runway threshold, thinking my plane to be closer than it actually was.

There is a small trick that can help. Clench your fist and stick the thumb up. Hold out your arm and place the top of the clenched fist along the horizon line. The tip of your thumb is then at about 6 degrees above, which is the best angle of approach. The plane should stay at this 'height' all the way in to touchdown, which should be close to you and hence on the runway.

It sounds a bit crude but it does work. Incidentally, if you want a 3 degree flat approach, the knuckle of yuor thumb is about right.

Thread: Tony Nijhuis Harvard - Build Log
25/09/2018 20:26:00

I've put this build in my diary Geoff. Glad to see it underway and look forward to more details.

Pete

Thread: Disappearing Lasers
24/09/2018 12:04:37

Nice one John!

Thread: Gutted!
23/09/2018 11:00:32

What can I say but commiserations Cliff. It was a lovely model.

Is it salvagable?

Thread: Identification needed
22/09/2018 19:50:03

The aircraft is a Fairy 111D. This type of aircraft was the first to fly the South Atlantic in 1922 piloted by two Portuguese naval officers. The flight started at Lisbon and I assume that the monument is to commemorate the event.

The actual aircraft is in the Naval Museum in Lisbon. They were brave men to tackle a long flight over open water in a single engined aircraft.

There is a nice article about the flight on the Aces Flying High website.

Pete

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