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Member postings for kc

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

Thread: cutting foam
19/12/2018 14:08:01

If you only have one or two wings to cut rather than spend a lot of money on special wire and lab quality power supplies it might be cheaper to get them cut by a specialist such as BillKits (advert in BMFA mag usually)

But I use a bit of wire from an old electric fire element ( slightly sandpapered to remove any deposit ) and an old transformer from an old boiler. I adjust cutting speed instead of altering the voltage.

My tip is to avoid asking your wife to help hold the other end of the bow and ask an aeromodelling friend instead. It's easy to have a disagreement about the speed and therefore losing a friend is probably cheaper than a divorce.

Edited By kc on 19/12/2018 14:08:59

Thread: Can a drone fly at 10000ft?
19/12/2018 13:43:17

Now they are blaming chinese lanterns for a near miss!   This time it was 20,000ft and Cambridgeshire  ( see Daily Mail website)

Edited By kc on 19/12/2018 13:50:33

16/12/2018 19:04:41

So do we think a normal quadcopter of the sort easily bought online would reach that height or does it need to be specially modified with high altitude props etc?

It's much more worrying if it's been specially modified to achieve the altitude and not just a rogue flyer young kid mucking about!

Thread: Christmas films worth recording
16/12/2018 14:11:18

Several TV series had model aircraft for the flying sequences done by David Boddington and his colleagues ( who else but the great Boddo) These series don't seem to get shown now on TV but they are available on DVD - Flambards - Wings- Airline . I particularly recomend Wings - ( kindly lent to me by a forum member a few years ago)

Edited By kc on 16/12/2018 14:16:20

Edited By kc on 16/12/2018 14:18:09

Thread: Can a drone fly at 10000ft?
16/12/2018 13:57:52

Well I asked originally if drones could fly at 10000 and some people here have said it's possible, so I accept it's possible.

Then the question becomes why cannot a quadcopter be spotted by radar and the pilots warned. If radar cannot spot such a small item then surely all air defence is unable to protect us from terrorist or foreign enemy attack by drones with noxious stuff on board ( remember Salisbury! ) Improving radar would seem more important than ever.

If radar cannot spot our planes then it would seem likely that all quadcopters and maybe all model planes will have to be fitted with transponders in future. If so what sort of weight & bulk would be likely?

Thread: Christmas films worth recording
15/12/2018 19:50:19

It's quite interesting that they should schedule showing Battle of Britain this week of all weeks!

Thread: Can a drone fly at 10000ft?
15/12/2018 13:24:01

The trouble is it's aeromodellers who will be the scapegoat!

Geoff - should we be using technical terms that are not in the Glossary?

15/12/2018 10:43:05

The BBC report a near miss between a Boeing 737 and a drone at 10,000ft . Can a quadcopter of the hobby type fly at that sort of height?

Thread: Christmas films worth recording
14/12/2018 20:10:13

The Man in the Sky is a good film about planes. features a Bristol Freighter. Been on several times recently on Talking Pictures ch 81, likely to be on again soon.

The Sound Barrier features a Supermarine 535 and is another film that comes up often on Talking Pictures.

Thread: Hi all..
14/12/2018 19:57:28

Don't forget to check out the numerous aircraft museums which are mostly open all the year round. Old Warden, Duxford, Cosford, Mosquito Museum Hatfield are all within a days drive. I think there is an aircraft engine museum near Bristol.

Not much in the way of shows until summer but there is a lot of local indoor flying if you look around. A bit of indoor flying display at the London Model Engineering Exhibition in mid January

Thread: 1/2 scale Druine Turbulent
13/12/2018 16:09:09

the Peter Miller 58 inch plan from RCModelWorld should be available from Sarik

Thread: Build query
12/12/2018 17:08:49

If you have bought a SLEC balsa stripper it is possible to cut non standard sizes by making extra spacers from paper or card or veneer or ply or even a couple of layers of masking tape to cut just a little thicker.

Cutting thicker than 1/8 means making several light cuts rather than one cut to full depth.

Thread: BMFA club finder
12/12/2018 11:36:17

Note that for the BMFA clubfinder London Borough clubs are shown as London while the county just outside are in the actual County. e.g. Dagenham is in Essex rather than having a London postcode but the Dagenham club does not correctly show as Essex but as its in a London Borough it comes under London in BMFA.  Confusing!   May be something similar with west London clubs.

Edited By kc on 12/12/2018 11:39:27

Thread: Build query
12/12/2018 11:25:44

On checking the small plan on the screen I cannot see whether the wing is fully sheeted on top or just the centre section. Maybe ribs W1 and W2 are thinner than W3 to allow for sheeting only centre section. Difficult to tell without the fullsize plan.

12/12/2018 11:10:39

I don't use aliphatic so I don't know if it fills gaps, but I wouldn't expect it to fill very much without something like micro balloons added to stiffen the mixture. Micro balloons works well with 5 minute epoxy to make a stiff mixture, but it's possibly too heavy if you need to do it on every former. .

Much better to fill the gap with a sliver of balsa after fitting stringers. ( plane a length off balsa with a razor plane if you need a lot ) Better still cut your own stringers from balsa with a balsa stripper to correct size. Or order a few more stringers and hope they fit better. ( check whether the slots or stringers are metric sizes rather than imperial!) The fuselage stringers won't be too critical but the fit of the wing spars would need to be very close to make a strong wing with  unsheeted construction..

Edited By kc on 12/12/2018 11:14:12

11/12/2018 19:22:27

No, I have not built this model but just looked up the plan on Outerzone.

Not much difference in strength. Join sheets using the standard method of utilising the machine cut edge (instead of cutting it yourself ) for accuracy. I place the 2 bits tight together, stick masking tap over the join, then place over the edge of the bench and let the joint hinge open to apply PVA. Close the joint and apply a masking tape to the other side. Or leave the joint closed and apply thin cyano from the non masking tape side. Use the same thickness of sheet for both parts preferably the same sheet. Sheets vary and especially 1/4 which sometimes is only 6mm.

I can see why you asked before about laminating. David Mellor's advice was good ( see his postings for much info on laminating) However for simplicity I would make the rudder TE from 2 layers of 1/8 balsa using 2 long scarf joints, then do the second layer with joints staggered and the grain at a different angle to the first layer.

Edited By kc on 11/12/2018 19:23:14

11/12/2018 18:41:01

The other possibility is to put the pattern onto the 4 inch balsa sheet and fit as best you can - if the grain is about 45 degrees it will be strong enough.

11/12/2018 18:36:20

I suggest adding a bit to the sheet in the area I marked in pink


Edited By kc on 11/12/2018 18:45:27

11/12/2018 15:55:03

Disagree with Geoff - could be the design needs a 1/2 strip of hard balsa for strength at the hinge line glued to a light /soft piece for the rest of the fin. Grain should be vertical as Geoff said. Otherwise join the 1/2 bit to the front of the fin ( might be just a small triangle needed)

Joining bits to make a wider sheet is best done before cutting to final shape. Sometimes you just need to add a small scrap piece not a whole sheet.

If you state what design you are building some of us may have the plan to look at and advise more accurately.

Thread: BMFA mag's going a bit over the top?
09/12/2018 17:23:14

The point is this corrections leaflet contains so much unneccesary wording about diversity and equality that the really important legal points about flying heights etc will get overlooked.

Printing a table showing what height restrictions apply to what size or type of models would have been so much clearer. Similarly perhaps another table showing how close to buildings we are allowed to fly with or without cameras.

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