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Cheshire Falcons

Model Flying Club



      


                                                                                    




Beginner's Corner    

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www.droneybee.com offer a series of tutorials to take the newcomer
by the hand to de-mystify technical aspects and explain the skills you will soon
be using every time you fly.









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They have a tutorial explaining the skills you need to learn to fly a glider successfully









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All you need to know about the use of LiPO batteries









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and all you need to know about charging up LiPO batteries as well.




With thanks to droneybee for letting us use your tutorials in our pages.





Prop Chart For Two-Stroke Engines
Alternate Propellors Starting Prop Engine Size
5.25x4, 5.5x4, 6x3.5, 6x4, 7x3 6x3 .049
7x3,7x4.5,7x5 7x4 .09
8x5,8x6,9x4 8x4 .15
8x5,8x6,9x5 9x4 .19 - .25
9x7,9.5x6,10x5 9x6 .20 - .30
9x7,10x5,11x4 10x6 .35 - .36
9x8, 11x5 10x6 .40
10x6,11x5,11x6,12x4 10x7 .45
10x8,11x7,12x4,12x5 11x6 .50
11x7.5, 11x7.75, 11x8,12x6 11x7 .60 - .61
11x8,12x8,13x6,14x4 12x6 .70
12x8,14x4,14x5 13x6 .78 - .80
13x8,15x6,16x5 14x6 .90 - .91
15x8,18x5 16x6 1.08
16x10,18x5,18x6 16x8 1.20
18x8,20x6 18x6 1.50
18x10,20x6,20x8,22x6 18x8 1.80
18x10,20x6,20x10,22x6 20x8 2.00




Prop Chart For Four-Stroke Engines
Alternate Propellers Starting Prop Engine Size
9x5,10x5 9x6 .20 - .21
10x6,10x7,11x4,11x5.11x7,11x7.5,12x4,12x5 11x6 .40
10x6,10x7,10x8,11x7,11x7.5,12x4,12x5,12x6 11x6 .45 - .48
11x7.5,11x7.75,11x8,12x8,13x5,13x6,14x5,14x6 12x6 .60 - .65
12x8,13x8,14x4,14x6 13x6 .80
13x6,14x8,15x6,16x6 14x6 .90
14x8,15x6,15x8,16x8,17x6,18x5,18x6 16x6 1.20
15x6,15x8,16x8,18x6,18x8,20x6 18x6 1.60
18x12,20x8,20x10 18x10 2.40
18x10,18x12,20x10 20x8 2.70
18x12,20x10 20x10 3.00



THE 35 MHz BAND




The 35 MHz Band.

 

(a) Identification is by orange flag with black or white channel numerals.

 

CHANNEL FREQUENCY                                CHANNEL FREQUENCY

 

channel 55      34.950                                     channel 73      35.130

channel 56      34.960                                     channel 74      35.140

channel 57      34.970                                     channel 75      35.150

channel 58      34.980                                     channel 76      35.160

channel 59      34.990                                     channel 77      35.170

channel 60      35.000                                     channel 78      35.180

channel 61      35.010                                     channel 79      35.190

channel 62      35.020                                     channel 80      35.200

channel 63      35.030                                     channel 81      35.210

channel 64      35.040                                     channel 82      35.220

channel 65      35.050                                     channel 83      35.230

channel 66      35.060                                     channel 84      35.240

channel 67      35.070                                     channel 85      35.250

channel 68      35.080                                     channel 86      35.260

channel 69      35.090                                     channel 87      35.270

channel 70      35.100                                     channel 88      35.280

channel 71      35.110                                     channel 89      35.290

channel 72      35.120                                     channel 90      35.300

 

(b) To identify the channel number of an untagged crystal:

 

(1) If the crystal is marked 34.xxx you subtract 40 from the first two numbers after the decimal

point of the frequency marking, (i.e. 34.960, subtract 40 from 96 giving channel 56).

 

(2) If the crystal is marked 35.xxx you add 60 to the first two numbers after the decimal point of

the frequency marking, (i.e. 35.260, add 60 to 26 giving channel 86).

 

  The UK Radio Control Council is responsible for monitoring UK aeromodelling frequencies.







Hints and Tips.
Cleaning up an old engine

I bought an Enya 35 engine with no guarantees from eBay. It arrived in working order but caked with resinified castor oil. This has a plain bearing crankshaft so everything barring the carburettor/piston, conrod and liner was dropped into a syrup tin with a pint of glycol antifreeze (must not contain methanol-some do) and gently brought to the boil. (I would have hesitated to treat a ball raced crank in this way.)
The house rapidly filled with noxious fumes and a Divorce having been narrowly averted, the job was later completed on a gas barbeque at the bottom of the Garden.
Mono ethylene glycol, the main component of antifreeze, boils at 197'C but in an open top can will not catch fire until 410'C. It is relatively easy to reach a boiling simmer, but great care should naturally be taken to avoid splashes to the skin and particularly the eyes. Dont inhale the fumes and bear in mind that MEG is very toxic, as little as 2 tablespoons-full if ingested, could be a fatal dose.! It took about 30 minutes to reach the simmer stage, successfully achieved without getting badly burned fingers, and was then allowed to cool down.
On removal, the components were washed with water and a long bristled brush reached the parts not already spotless. It now sparkles like a new motor!

Safety note-

This procedure is considered to be hazardous and should only be conducted with due care and with adequate supervision where applicable. The use of leather gloves ,safety goggles and a sturdy apron, is recommended.

Cheshire Falcons can accept no liability whatsoever for damage to property or injury caused to persons (or nearby animals / pets) if attempting to follow the above method of cleaning.







Check and Check Again ( preferably before installation)
I was fitting and adjusting servos, snakes, clevises and the rest, to a model bought on eBay
but some items should not be re-used when they have clearly taken a battering in earlier models.
On that basis I bought a new 5 channel Rx and a new on/off switch with charging lead.
Only when the installation was complete did I discover that the charging lead was dead.
When I investigated, I discovered that 2 of the 3 soldered tabs behind the switch were 'dry' joints, a fault which could easily have destroyed my model.
A case of shoddy manufacture with no quality control. You quickly learn which suppliers you can trust, you will find some of them them listed on our 'favourite links' page.




Rechargeables for a Sanwa RD 6000 Super Tx
I decided to replace my Tx batteries with 2,500mah NiMhs to give me more flying time. The battery arrived complete with a compatible Hitec type plug wired the usual way ,centre pin live. Consternation when I noticed ( fortunately in in good time) that the Tx was wired outer pin positive. A simple matter to change the pin position , of course, and then I read the large print warning in the Instruction Book not to confuse such connections.!
If you do then just drop the Tx in the nearest bin!
I notice though that the recharge plug is +ve connection innermost, in the usual way.
PS the Tx is a masterpiece of computerisation, it works & recharges fine, so I must have made all the right connections!

Avicraft recently reported unexpected dangers when using Superglue.
An interesting observation that you should not breathe the fumes if Cyano'd joints are subjected to excess heat when sanding or drilling.


Your 2.4 GHz aerial may be small, but watch where you wave it.
Did you know that if you inadvertantly left your 2.4GHz transmitter switched on in the house, it would almost certainly disrupt the way your wireless router worked. This is why


Beware the strength of epoxy adhesives.
I have just reinforced the firewall of my Acrowot as after 2 years of heavy use the OS61FX was beginning to move slightly. I bolted the new ply face to the Box section whilst the epoxy cured. But instead of smearing the bolts with grease, I simply sprayed with WD 40.
Mistake... I had to grind the head off two of the bolts, the nuts were firmly epoxied in place!!
Dont get lazy!
Fourth flight of the day , about an hour in the air, with my Avicraft Panic, my SC53 was tuned to perfection & had been pulling well
when without warning the throttle jammed open!
Although I had a niggle that the flight battery might soon pack up on me, I realised that I could occasionally blip, and managed to drop the revs to about quarter throttle, but still far too fast for a damage free landing. The engine note would just not drop to tickover!
Nervous about a fly-away, I practiced close-to circuits and low figures of eight for about 20 minutes till the fuel ran out ( before the flight battery did!) and then was able to safely deadstick...Phew...
That is when I discovered that the Throttle Stop Screw had vibrated so loose that the carb rotor had been trying to escape.
By some miracle I did not lose the screw & spring..
The message:- check & check again!


Safety First
I dropped my WM Spitfire 63 into my new 'corkscrew' restraint and started the engine on about quarter throttle,
I did not expect the model to drop its nose and escape!

Fortunately there was no serious damage to man or machine, but in future I will use a rubber band as shown.




                                                






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