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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: Can you identify this model aeroplane?
18/01/2021 16:01:08

Sorry for the delayed reply, Murat, I've been looking for any drawings or info I might still have but after all this time it's either been discarded or well hidden amongst my collection of model plans etc.
My Diamond is 100" wingspan, the wings are obeche veneered foam with balsa LE & TE. I bought the basic wing, without LE & TE, with the fuselage. There was also a 120" wing available, also of veneer foam construction. There was no plan as such, just a dimensioned sketch of the model. The wing section is one of the Eppler series with a small amount of undercamber. I could be wrong but E374 rings a bell.
I'll keep looking for more info & get back with at least the dimensions measured from my own model.

Meanwhile if I've got it right there should be a short (poor quality) Youtube video taken from the model about 10 years ago.

Edited By PatMc on 18/01/2021 16:09:14

Thread: Film over tissue
18/01/2021 15:42:45

I used an iron to apply & shrink the film. In fact after the initial shrinking process I deliberately went over each between rib area and ensured that the film had stuck to the tissue in order to get the strongest torsional stiffness. This also gives the finish a slight texture taking away some of the, IMO, unsightly over-glossy plastic look.

Note that the black covered spar to LE area is sheet covered (including the bumpy looking outer sections) but the lower wing surface is completely un-sheeted.
The wings of ASK 14 motor glider in my avatar is also covered with Solarfilm over tissue although it has a full "D" box LE.

Thread: How complicated?
17/01/2021 16:38:54

No, Peter specifically mentioned "electronics experts".

17/01/2021 15:58:55
Posted by Peter Miller on 17/01/2021 14:32:46:

Ah! Well that is modern electronics created by electronics experts.

Electronic experts are an alien race who just cannot understand human beings.

The idea that a creature needs logical and detailed information just does not enter their carapace or where ever they store what is laughingly called their brains.

But if it wasn't for what is laughingly called the electronics experts' brains we wouldn't be be having this virtual conversation. wink 2

Thread: Film over tissue
17/01/2021 15:43:15

Yes, no problem.

The wings of my RelaxE were covered with tissue, given a single coat of thinned dope then covered with Solarfilm.

The tissue gives more torsional stiffness than film alone, the film protects against hanger rash & punctures. Together I think it's a lot torsionaly stiffer than the sum of the two covering materials for very little extra weight.

RelaxE converted to brushless

Thread: Can you identify this model aeroplane?
17/01/2021 00:07:24
Posted by Murat Kece 1 on 15/01/2021 23:31:03:

I have been given some glider fuselages. I would like to use some of them by finding/making wings and control linkages for slope soaring. I have no clue what make/kit/design they are. Any help with identification will be much appreciated.

2) Red 52" glider fuselage with 9" wing cord (Full tail elevator)

20201113_200957.jpg20201113_201011.jpg20201113_201410.jpg

4) 54" glider fuselage, Brown, with 10" wing cord (Full tail elevator)

20201113_202302.jpg

20201113_202343.jpg

Hi Murat, glider # 2 is a Diamond, the fuselage was made by John Hall in Somerset back in the 1980's.

Diamond

This is mine. Originally flown with rudder & elevator only (as designed) I converted it for ailerons. The dihedral appears greater than it actually is because of the wing sweep back. I built it some time in the 1980 & it's still in flying condition today though it hasn't flown for over a year due to lack of opportunity & the pandemic.

Glider #4 looks like one I have stored (but not worked on) in the attic. If it is it will be an epoxy/glass fibre moulding whereas the Diamond is polyester/glass.

Thread: Watts/lb misleading?
14/01/2021 22:39:39

Re the watts/lb question, I think for a scale like performance virtually all scale really only need similar power : weight ratios to the full size aircraft they are based on, using the mid range weight. Power & weight figures for most popular scale choices can be had from Wiki.
The figures for many sports models could be estimated by comparing with a similar style of full size as the model.

A while ago I made up an Excel file that returns the model weights, area, power etc for any chosen scale when the full size data is entered.
It will give, what I consider, practical results for light aircraft, WW1, trainers & motor gliders etc but not for WW2 fighter type weights & power levels (though IMO the power to weight ratio should be the same for any model and it's full size counterpart).
If anyone want's to try the Excel file for themselves just drop me a PM.

14/01/2021 22:09:14
Posted by Matt Carlton on 14/01/2021 17:46:29:

So, for a slow flying model like a Junior 60 say, a big, low pitch prop, on a hefty motor should be fairly efficient? So less current = less capacity required for same flight duration = lighter weight = less power required!

Is it possible to gear an outrunner down to drive some really slow high pitch props like those used for rubber power??

Just use a low KV motor.

I've been using a 1000kv motor in my Jnr 60 for a few years. It drives a Topflite 11x6 ic wooden prop, on 3s lipo at WOT : 8800 rpm, 27A, 300W. Model weighs 3.75 lb, so that 80W/lb & is well overpowered but flies mostly at very low throttle.
About 15 months ago I changed the motor for a 600kv one of about the same weight with the intentions of trying it with13x6 & 13x8 wood props. I did a few ground test measurements which looked quite promising (I can't remember the numbers now) & was all ready to flight test the set up but unfortunately life stepped in & I haven't been able to fly at all since.
I hope to be able to resume flying when the present pandemic crisis is over & see how this new power set up performs.

14/01/2021 20:58:32
Posted by Geoff S on 14/01/2021 17:06:40:
whenever. I had my Corvid (Pfizer) vaccination today, so here's hoping yes

Geoff.

Are you crowing about getting the injection, Geoff ? wink 2

Thread: Ben Buckle Vintage
04/01/2021 19:11:20

See this thread.

Thread: Import tax/VAT from europe.
04/01/2021 19:07:37
Posted by kc on 04/01/2021 18:02:43:

The BBC website says " This essentially means that overseas retailers sending goods to the UK are expected to register for UK VAT and account for it to HMRC if the sale value is less than €150 (£135). " But I wonder if that was in fact a misprint - I would expect it to be MORE than £135 rather than less. Surely it's the goods over 135 that would need to be taxed too, otherwise it's a loophole when you buy your next turbine or expensive camera etc etc - VAT free if you buy in EC countries!

It's not a misprint.

The VAT for goods over £135 will charged then collected on receipt, no doubt with the courier's fee (& the VAT on postage ?) added.

Thread: New mod's
02/01/2021 23:49:02
Posted by Gary Manuel on 02/01/2021 20:23:02:
Posted by Shaunie on 02/01/2021 19:54:11:

Gotta throw my tuppence worth into the ring.
Please get rid of the Grocer’s apostrophe’s. They have no place in an upper crust forum such as this. Especially one hosted by a publishing house. 🤪

Surely you mean Grocer's apostrophes Shaunie.

No, I think he means "grocers' apostrophes". wink 2

Thread: Import tax/VAT from europe.
02/01/2021 21:52:32

I think Dickw is correct, third paragraph under Outline of Changes here link 

Quote : 
Online marketplaces (OMPs), where they are involved in facilitating the sale, will be responsible for collecting and accounting for the VAT.

For goods sent from overseas and sold directly to UK consumers without OMP involvement, the overseas seller will be required to register and account for the VAT to HMRC.

 

Edited By PatMc on 02/01/2021 21:57:17

Thread: Advent Prize Draw - 24th Dec - last one!
23/12/2020 22:43:56

I'd like to give it a whirl. thumbs up

Thread: Advent Prize Draw - 23rd Dec
22/12/2020 22:45:59

Yes please, I need all the light I can get.

Thread: Free Flight Ray Malmstrom Skygipsy with AE 0.2cc
20/12/2020 22:15:33
Posted by Piers Bowlan on 20/12/2020 05:28:37:

I am not really an engine man 3) probably doesn't make any difference anyway! I only queried it because I was concerned that a high tank position might flood your inverted engine.

It may seem counter intuitive but an inverted 2 stroke is less likely to flood (or suffer hydraulic lock) than one mounted upright.

 

Edited By PatMc on 20/12/2020 22:17:22

Thread: Advent Prize Draw - 21st Dec
20/12/2020 22:08:47

That'll do nicely. thumbs up

Thread: Advent Prize Draw - 20th Dec
19/12/2020 23:07:03

Count me in please.

Thread: Advent Prize Draw - 19th Dec
18/12/2020 19:53:50

Always an essential tool for electric flyers.

My (very) old Hyperion Emeter has gone belly up & needs replacing so - 🤞

Thread: Advent Prize Draw - 18th Dec
17/12/2020 21:53:31

Yes please, count me in.

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