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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: Aileron differential
23/07/2017 07:46:42

I recently built a gull winged vintage model from a very old plan which exhibited considerable adverse yaw even with 50% aileron differential. (The wing had a constant chord, fat section, with rounded tips so definitely not high aspect ratio).

It required large amounts of rudder in order to turn at all, however too much rudder caused the lowered wing to tuck under without warning. It was not a pleasant model to fly!

Unfortunately I wrote it off due to other reasons before I was able to sort the settings out properly. Perhaps it was a blessing in disguise.

The moral of this? Be careful of putting too much rudder in when sorting out the settings....

Edited By Broken Prop on 23/07/2017 07:47:46

Thread: Wing set up - washout too?
23/07/2017 07:29:30

Thanks for that Cymaz. Good article!

Thread: Man on the moon. Really?
19/07/2017 20:58:45

I am utterly convinced that the Americans went to the moon. The only thing that confused me was the sight of a set of narrow wheel tracks that did not match the Moon Rovers. Then I realised it was the tea trolley.

Thread: What Paint and What Base Coat
19/07/2017 20:52:16

Hi Stuart

As Dennis says you will get overspray no matter what size gun you use. I improvise a spray booth from cardboard packing cases opened out. The back board can be used for trying out paint and for clearing the gun periodically as required. Just throw it away when finished.

Even with the temporary booth limiting the spray and an extractor fan going there is still overspray in the air and it has to settle somewhere. Cover everything in sight with polythene or paper, especially your treasured models as a speckled flourescent green Fockwulf 190 will not be convincing down at the patch!

ALWAYS wear a mask such as a JSP Force 8 with the appropriate filters as paint is nasty stuff to get in your lungs.

I have sprayed on Solartex using Spectrum paints, thinned using their thinners. They cover fine with no base coat and are fuel proof. Solarlac is also very good for spraying, again thinned down.

For large areas I use an Iwata Eclipse G6 which will cover up to 65mm, although coverage is getting a bit thin at that width. For more detailed work I use an Iwata Revolution TR2 as I prefer an airbrush with a trigger action. have a good range of products and are nice people to do business with.

Caution: These are not cheap items and can seriously damage your wallet. Other makes are available!

Good luck with the spraying!



Edited By Broken Prop on 19/07/2017 20:52:47

Thread: Double Diamond
10/07/2017 21:41:52

D.D that flies very nicely indeed. I loved the smoooooth turns!

A lovely model!


Thread: BAT-SAFE
16/06/2017 08:27:41

thumbs upidea

Thread: Rib extrapolation / interpolation
23/05/2017 16:11:59

Ah, that one I do remember. It is used to produce a ruler to the scale that you require.

Draw a horizontal line to the length of the original item. Mark off any intermediate points, say inch divisions.

Draw a line at an angle up from the origin. Any angle will do, but if the item is not too large, 30 degrees is OK. Mark the new required length at the far end

Draw a line from the right hand end of the horizontal line up to the mark you have just made.

Set your set square to the angle of that line. Draw intermediate points from the original line up to the new line to produce a ruler to the scale that you need.

This method works best if the line that you draw from the end of the original line to the new line forms an acute angle.

23/05/2017 15:34:59

Crikey Bob, I had forgotten all about that method of graphical enlargement (which I originally learnt at school too many years ago for comfort).

I could feel the ancient cogs grinding as I read your post. Thanks for the reminder!


Thread: Just Engines
19/05/2017 20:40:49

I have just taken delivery of some parts for an OS81 FS pumped, all supplied by Just Engines.

I had initially incorrectly ordered one of the parts and the company was extremely helpful in changing the order and checking for the correct carburettor body. Some of the parts were not in stock but I was told that I could expect delivery in about a week and so it proved to be.

A really professional service, gratefully received.


Thread: Anet A8
07/05/2017 20:27:12

That all looks very impressive Geoff. I particularly like the concept of a machine that bulids its own updates!

The exhaust stubs that you showed me earlier today are amazing! Thanks for sharing.


Thread: Acrylic paint
06/05/2017 19:34:49

If it helps, I have successfully sprayed Galleria artists acrylic, diluted about 20% with water.


Thread: Women say the funniest things!
06/05/2017 08:12:35

My wife said I should give up aero modelling. Oh how we laughed.

Thread: Vinyl Cutting
03/05/2017 10:02:10

Thanks for the information guys. I'll give those products a try.

I went on line and found what appears to be a suitable material by searching under 'Stencil Masks' (as used by professional sign writers). MDP Vinyl offer a range of masks in roll form at very reasonable prices, all of which are stated as being suitable for cutting with a vinyl cutter.

One in particular caught my eye as it was for use on flexible surfaces such as fabric canopies over shop windows. It could be suitable for open framed structures such as we use. I have ordered a roll and will report back on its suitability.

BTW the company has a dedicated area for Silhouette Cameo users.

Thanks once again


01/05/2017 11:37:48

Hi Guys

I have a Silhouette Cameo which is great for cutting vinyl, however I have recently been trying to cut (rather large) paint masks in Frisket film. Abject failure as the film tends to bunch up in the machine, which then gently shreds it!

Can anyone please recommend a suitable paint mask material which the Cameo will cut without problems?

Thanks in advance


Thread: Gaining / losing altitude on turns
25/04/2017 22:08:14

Hi Tony

Glad to see that you have joined our happy band of brothers. Good luck with the A Certificate.

The throttle is used to make the aircraft ascend and descend, due to the increased (or decreased) flow of air over the wing and hence the amount of lift. The elevator controls the attitude of the plane. As you turn it may be necessary to increase or decrease the throttle gently as you roll out in order to keep flying at the same level. Others will no doubt explain the reasoning better than me.

In addition you may need to take account of the wind direction. As you turn into wind the aircraft will ascend as the airflow increases over the wing and you will need to throttle back a little. Turning downwind has the reverse effect.

Play with the throttle a little in the turns and note the effect.

Good luck


Edited By Broken Prop on 25/04/2017 22:09:15

Thread: Multiplex Cockpit Sx 9
29/03/2017 10:40:57

Thanks Frank. It looks like I have some catching up to do. yes


28/03/2017 18:44:22

'...allows you to lock a Rx to specific model memories...'

I'm going to show my ignorance and ask wazzat then?

Also where do you find Safe Link on the updated Profi?

Also, how do you find out what the latest TX upgrade does? I can't find an explanation anywhere.

Told you I was ignorant. wink


Edited By Broken Prop on 28/03/2017 18:45:05

Thread: BMFA Buckminster Early Summer sport fly-in
18/03/2017 08:59:39

Ditto thumbs up

Thread: Thumbs, sticks and a strange habit??
18/03/2017 08:56:39

I have just gone over to a tray type transmitter from a 'thumbs on top' type. At first it felt very strange and I found that I overcorrected the stick movements until I stopped thinking about what the sticks were doing and concentrated on what the plane was doing!

I noticed that I instinctively rested my hands on the TX, using just the thumb, index finger and second finger to move the sticks. Supporting the hands also gave me reference points by which to gauge the amount of stick movement and also to steady my fingers. With the hands unsupported stick movements tended to be a bit random!

The downside of the tray type TX is that I find it difficult to adjust the trims as I do not have spare digits in the right place. I will get used to it in the end but you know what they say about teaching old dogs......

Thread: Kavan or other good qualty ball joints and clevises
06/03/2017 07:46:11

Graupner still make quality M2 quick links and (I think) ball joints.

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