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Member postings for PatMc

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

Thread: Hobby King Again Rrrrrrrrrr
14/11/2019 17:49:14
Posted by Andrew Calcutt on 14/11/2019 16:13:33:

Because of hobbyking most of the models shops have closed,

Nonsense.

Take a look at retail in general across the UK. The stores/shops that didn't adapt to modern retail trading trends have either disappeared or been taken over.
It's the traders who offer customers the most attractive overall packages who survive.

Thread: Charge rate ???
10/11/2019 19:01:19

For that charger the max current output is 7 Amps but the max power is 80 Watt.

This means that voltage required to charge the battery times 7A can not exceed 80 Watts.

In the case of a 6S battery - the charging voltage required will be 4.2 x 6 = 25.2 v. So the charger will limit the current to 80 Watts/25.2 v = 3A [aprox]

Edit - In case you're wondering where I got 25.2v for the battery from. A fully charged lipo cell is 4.2v, 6s = 25.2v. The charger will normally be delivering around this voltage for most of the charge period.

 

Edited By PatMc on 10/11/2019 19:08:44

10/11/2019 17:50:01

A caveat to the above advice - if your charger is limited to 50 Watts it will not charge 6s above a 2A rate.

Do you know what the limit wattage of the output is ?
If not what charger is it ?

Thread: heat shrinking mylar film
09/11/2019 21:49:38

Hi Dean, it used to be fairly common for small free flight & light weight vintage rc models to be covered with 5 or 10 micron mylar but with lightweight tissue dope on top.
The mylar was usually stuck in place with a thinned contact adhesive before being heat shrunk. But the shrinkage was fairly limited & there was nearly always some wrinkling. The top tissue covering hid most of the wrinkles when it was applied dampened with water then given 2 or 3 coats of thinned dope to tauten it.

Nowadays it's more common (with vintage models at least) to first cover with laminating film (around 25 - 35 microns) which already has heat activated adhesive like the normal model covering films. This is heat shrunk until taut, then tissue covering applied for decor.
I believe in the US the film is generally known as "doculam".

I've only ever covered one model, a Keil Kraft Chief glider, with tissue over 10 micron mylar & to be honest I didn't find it very satisfactory. Since then I've covered a couple of models with tissue over laminating film. This has turned out to be a little heavier but better in all other respects.

Some details of my first try of tissue over "doculam" on this thread and some more on the second page of my Amigo II glider build blog.

Thread: North Lakes / Penrith area
08/11/2019 21:06:06

There used to be a group that flew at Bewaldeth a couple of miles north of Bassenthwaite just of the A591.

IIRC David Ashby was trying to make contact with them a 4 or 5 years ago, dunno if he succeeded.

PS - Just found the thread started by David. The link i provided is now dead. The phone number Percy gave may no longer be relevant. 

Edited By PatMc on 08/11/2019 21:17:58

Thread: 1s LiPos and receivers
05/11/2019 19:59:40

Is this FASST Rx compatible with your Tx ?

Thread: I know what it is but do you ?
02/11/2019 18:14:19

What's the RTF weight & wing area ?

Thread: Wattmeter Quandry?
02/11/2019 00:11:22

You have got better results - same rpm for lower current. Perhaps the motor bearings have loosened up.
In fact the new rpm figure is probably higher than the first but the difference isn't enough to register, does the tacho reads in 100 rpm increments?

Thread: Whotsit
01/11/2019 11:28:51

Looks like an APS Saracen. Search for Saracen on Outerzone, the plan is listed there.

Thread: Electric power options. Sonata E kit.
31/10/2019 18:19:45
Posted by Piers Bowlan on 31/10/2019 16:53:15:

One of these motors would be suitable with a 9x6 prop (on a 3s LiPo) perhaps. Or may be one of these for a very spritely climb! They are both 28mm in diameter so should fit within the fuselage nose with room to spare for the three wires.

I have bought quite a few Turnigy Plush ESCs in the past. Always rock solid performance and not had a duff one yet.

 

Edited By Piers Bowlan on 31/10/2019 17:07:27

Piers, both motors are rear mount. They would need either the shaft reversed or an extra bulkhead for the X mount as Levanter has done. That would require some method of access to the X mount fixing screws. It would be interesting to see how Levanter did it.

PS I'll second your recommendation for the Turnigy Plush ESCs & the linked battery thumbs up

 

Edited By PatMc on 31/10/2019 18:22:54

Thread: Am I getting to complicated?
30/10/2019 19:27:38
Posted by Dickw on 30/10/2019 13:32:24:
Posted by SIMON CRAGG on 30/10/2019 13:25:23:

Dick

Thx for that, you have lost me on this windings bit though. How do I know if the windings are Y or D? This is getting more confusing by the minute?

You don't know unless the manufacturer states Y or D wind somewhere in the spec - some do some don't.

Not a lot of help I know, sorry!

Dick

 

I doubt if any manufacturers produce any (Y) star wound motors. Delta wound motors are the same weight as star wound but have much more potential power. - IIRC Delta have root 3 times the power of Star wound.

Edited By PatMc on 30/10/2019 19:28:16

Thread: SC 91fs will not stop.
29/10/2019 22:39:52
Posted by bert baker on 29/10/2019 20:00:41:
Posted by PatMc on 29/10/2019 19:52:11:
Posted by Manish Chandrayan on 29/10/2019 19:18:06:

It could be via the front bearing.

It’s a four stroke so don’t think front bearing

Doh !! I didn't notice it was a 4s. blush

I suppose though, that if oil can escape from the cylinder to lubricate the bearings etc via the crankcase, then some air could also find it's way in the opposite direction.

Thread: source of 2mm Depron?
29/10/2019 22:28:11
Posted by Robin Colbourne on 29/10/2019 12:11:04:
Posted by Richard Harris on 28/10/2019 09:39:13:

Last time I bought some was from SAMS but they have run out.

If you can cope with 3mm B&Q sell it HERE , they also sell 6 and 10mm thicknesses

Rich

Richard, Do you happen to know how may sheets are in the 3mm B&Q pack? Their advert doesn't say, and the maths suggests its 13.3 sheets! dont know

My maths make it 8 per pack.

Thread: SC 91fs will not stop.
29/10/2019 19:52:11
Posted by Manish Chandrayan on 29/10/2019 19:18:06:

With the throttle barrel fully closed, the only way an engine can continue running is by sucking in sufficient air from some other opening. Assuming that there indeed is no air leak, it means that the barrel is not fully closed.

It could be via the front bearing.

Thread: Best light wind slope soarer
28/10/2019 22:29:25
Posted by Frank Skilbeck on 28/10/2019 21:55:40:

Dream Flight Alula is also great in light winds.

I think light weight models like the Alula are over-rated for light wind flying. They will fly in a breath but are not able to do much more than scratch to keep aloft when larger heavier models are able to do some aerobatics.

F'rinstance, here's some video taken in 2011 from my old 100", 5 lb, 14oz/sq ft Diamond. The Alulas couldn't reach the same altitude & were pretty much confined to a narrow band of lift whilst the Diamond was able to do at least some basic aerobatics.

Sorry about the video quality but it was taken by a low res FlyCamOne 2 camera..

 
 

Edited By PatMc on 28/10/2019 22:41:42

Thread: source of 2mm Depron?
27/10/2019 22:00:23
Posted by Roger Price 1 on 27/10/2019 21:49:24:

Apologies for being off thread but not tech savvy in starting a new one! Does anyone know a source for heavy weight tissue?

Try Mike Woodhouse, Free Flight Supplies **LINK**

Thread: Complete newbie.
26/10/2019 22:01:55

G'day, Gordon & welcome to the forum.
I think you've been overlooked as you've tagged on to another newbie's intro.

Dunno what the situation is in Oz re the availability of self build kits but I know of a number of people building vintage models from plans & I think semi kits so balsa seems to be still available.

Where are you in Oz & what type of model takes your fancy ?

Edited By PatMc on 26/10/2019 22:02:24

Thread: NEW POLL - do you use a throttle kill switch?
26/10/2019 21:49:12

Another sticky throttle. Centre of 3 posn switch for power live with voice warning. Also beeps if throttle off normal when power not live & beeps if power live & throttle not selected within 20 seconds.

Edited By PatMc on 26/10/2019 21:50:16

Thread: Sealing foam cored wings
25/10/2019 19:55:54

If there's a risk that cellulose based sanding sealer will find it's way through to the foam core then the same danger is present with Ronseal varnish which is also based on an EP  foam solvent.
Like Richard, I've also used doped tissue & sanding sealer on veneered foam wings without any problems.
I've used Wilko's water based varnish & Rustin's water based floor varnish on tissue covered balsa sheeted wings (but never on obeche veneer) again with no issues.

Edited By PatMc on 25/10/2019 19:58:02

Thread: PWM Switching rate anybody?
24/10/2019 22:25:13
Posted by Gary Manuel on 22/10/2019 12:09:19:

PWM = Pulse Width Modulation

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