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Member postings for Simon Chaddock

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

Thread: Interesting reply from email to Richard Moriarty, CAA
23/05/2019 14:20:04

Nigel R

As far as I can tell all the relevant documents state they apply to UAVs "over 250g".

Thread: RC Mercury Marauder?
23/05/2019 14:07:12


Actually the damage is more serious than perhaps the picture suggests..

When the wing folded it was initially retained by the aileron servo wires but they soon unplugged from the Rx leaving the fuselage free to 'lawn dart' straight down. The impact damaged to the motor mount, snapped the fuselage just ahead of the fin and RH tail plane.

The only completely undamaged bits are the ailerons, LH tail plane and the rudder.

Just to complete the picture, the salvaged 'electrics'


They will return in something.

23/05/2019 11:18:01

Well I found out one of the problems with 61 year old balsa - it gets very brittle!sad


It was rather turbulent so it was being tossed around a bit and just a bit too much elevator recovery action and ........

Little point in repairing it but nevertheless interesting while it lasted.

All the electrics will be salvaged for something else..

Thread: Interesting reply from email to Richard Moriarty, CAA
23/05/2019 09:00:57

Is this not like the agreement that has been reached in Canada? Membership and only at 'approved' sites..

It does raise the issue that it would in effect be 'preferential' legislation suggesting any flying outside 'approved' sites would require individuals to meet the full registration requirements, and costs, whether or not they were organisation members.

Not ideal but it is probably an attractive route to legislators and is along the lines of the role of the BGA and LAA

Edited By Simon Chaddock on 23/05/2019 09:01:39

Thread: Don Valley open weekend 1/2 june
20/05/2019 17:41:40

The problem is not bringing them but weather they can fly..

The long range forecast is suggesting 12 mph by midday Sat (a bit more on Sunday) which is about the limit for most of mine - new or old! wink 2

We shall see.

Thread: New- 2018 CONCORDE for 4x50mm EDF
20/05/2019 10:43:58

Very nice Tony and particularly that landing on grass that for full size would have been a corn field!

A bit cheeky but my only criticism is for that for true scale the wing from the front should look like this.

Concorde front

My favourite Concorde picture.

All done before the days of computer simulation it does rather show where all those £millions went on wind tunnel testing. wink 2


Thread: Don Valley open weekend 1/2 june
19/05/2019 22:11:44

I will be there, but like always for me, very subject to wind!wink 2

Thread: RC Mercury Marauder?
19/05/2019 11:57:34

No rocket but it certainly floats like a butterfly!

An edited video of this morning's 9 minute flight.

Not the neatest of landings but reasonably accurate for a no power circuit and approach.
Never used full power even for the launch! wink 2

Edited By Simon Chaddock on 19/05/2019 11:59:06

Thread: show us your scale glider
18/05/2019 17:08:05

My all Depron Glasflugel Libelle


2.1 m span with a one piece wing.. 340 g (12 oz) with a 1000 mAh 3s.

Looked more impressive than it flew but I did loop it once - carefully!.

Unfortunately it is no longer as I lost it in a thermal when just that bit too far away down wind!

I might be tempted to build another with the last of my Depron. wink 2

Edited By Simon Chaddock on 18/05/2019 17:10:11

Thread: RC Mercury Marauder?
17/05/2019 21:12:26

Now complete.


With its 1800 mAh 2s it weighs 425 g (15 oz).

At 75 W/lb it will not have 'rocket' performance but with its sail plane roots it should be quite adequate..

16/05/2019 22:51:40

The fuselage complete and painted.


Apart from the motor on the front it is visually almost indistinguishable from its original form.

The aileron is hinged with 'two way' cloth hinges again as before.


I had originally intended to paint the whole wing yellow but it does add quite a bit of weight so just the tip to contrast the black aileron.The rest of the wing will left doped tissue.

14/05/2019 09:45:13

With the rear part of the fuselage covered, doped and painted the tail plane and rudder final installation can be tested.

Just the fuselage to finish, then the wings.
Thread: Now That Is Proper Modelling...
13/05/2019 13:25:08

I wouldn't say "proper" so much as "specialised" but amazing non the less.

Thread: New- 2018 CONCORDE for 4x50mm EDF
11/05/2019 19:38:35

That is tremendous!

With all that thrust (and weight?) I suspect it will fly fairly fast.

Strictly of course the visor should come down as well.wink 2

Thread: Aileron differential
11/05/2019 12:11:37

If I remember correctly the Tiger Moth actually has an 'over centre' action on the down going aileron. The down movement does indeed reduce from its maximum as the full up travel is reached on the opposite aileron.

It would need a sophisticated computer Tx to reproduce this effect by servo travel adjustment.


Although you are applying a 'rudder only' correction I do wonder if you were in the plane the correction actually required would be to reduce the pro turn rudder and aileron inputs together. From the ground you just cannot detect the required correction until the nose has 'visibly' dropped.

How you work the controls is effected by the degree of bank and rate of turn being applied. In a turn you are pulling extra g and at steep angles, say 45 degrees, the drag rises significantly. Unless you compensate for this with control movements or more power the natural longitudinal stability of the plane will cause the nose to drop..

In normal flight sufficiently above the stall speed any small extra control movements required to maintain a constant turn, even if it means the controls are in effect slightly crossed, will not be significant but in a tight turn close to the stall speed and they certainly will.

I remember when I was learning to fly full size I could hardly detect the stick and rudder movements being made by the instructor during a constant turn but they were there - as you quickly discovered when you tried to do the same thing! wink 2

10/05/2019 09:14:24


Applying the rudder in opposition to the ailerons should normally be avoided, particularly at slow speed, as it a good way to enter a spin.

In simple terms all the controls are used at the same time for a turn but the degree of input is set by the need to avoid any slip or yaw and to maintain the required 'attitude' and speed. As a result the inputs, including power, may be adjusted from beginning to end of the turn.

A plane with a big relatively heavy wing, typically a sail plane, may require a substantial initial rudder input but then little or none during the turn but similarly opposite rudder and aileron to return to straight and level flight, be it full size or a model.

A 'fast jet' configuration plane on the other hand may only really need to use the rudder when at slow speed, during aerobatics or for a cross wind landing.

For practical reasons most models have sufficient natural stability and excess power that they can tolerate some slip or yaw during a turn without getting into difficulty. The classic danger point being a low or no power 'final turn' where the extra drag from unwanted yaw can, and does, lead to disaster.

10/05/2019 01:06:38


To be strictly correct the rudder is always required to perform a true coordinated turn even with differential ailerons as the degree of differential required is effected by speed, The inertia of the plane can play a part as well the engine torque applied..

In full size you have a 'turn and slip indicator' so you can accurately judge the correct rudder and aileron combination but it is rather more difficult to do this when standing on the ground. It is usually possible to set the degree of differential that gives a good result for a moderate turn using aileron only.

A more severe turn is still likely to require appropriate use of the rudder and ailerons, first to enter the turn and then to accurately maintain it.

Thread: RC Mercury Marauder?
08/05/2019 20:26:36

Just a bit further, the ESC installed and tested in situ with the motor.


It has a 'fingered' heat sink poking through into the airflow.


I have a suitable micro 6 ch receiver.


At least with 6 channels I can use the 'differential ailerons' option.

Edited By Simon Chaddock on 08/05/2019 20:30:12

Thread: CAA registration consulation
08/05/2019 10:53:50

But London Transport had to get permission to sell the right to build above their stations and the developer had to get permission to actually do it..

Thread: RC Mercury Marauder?
07/05/2019 19:58:32

The 'glued in' 3.7 g aileron servo.


It looks a bit sort of ' hanging in mid air' but there is not much structure to fix it to.

Note the small printed piece to allows a slot to be cut in the tissue for the servo arm to poke through.

The tip tissue covered but not yet water shrunk. That will have to wait until the rest of the wing is covered.


Thus the aileron servo is permanently sealed in!

Next the servo wires have to be extended and run through the wing. I do so hate soldering together 32 AWG servo wire! smile o .

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