alec james

I'm the same,glad it's just not me.

Doesn't work for me either did Friday though,seems to be in some sort of a loop whichever way l try

The article in the 1954 Aeromodeller was all a big con owned up years later by l believe the author, there was loads of words about it later in the modelling press but l can't recall which ones.

I am the same although not really surprised with what's going on with them at the moment, anyway what I had has now been sold on this forum.

Bruce...…..Thx for info. as feared I will have to get a USB cable. Not sure if we are really progressing with all this software and high tech bits and bobs but nothing I can say will change that.

I also have a AR636A Rx which is working fine but due to a mobile phone problem lost the software so can now no longer alter the settings on it. It would seem that Spektrum no longer offer the same software for Android phones which I have the lead for and as far as I can tell I have to fork out for a USB lead so I can programme this Rx, seems a backward step to me out at the field lugging a lappy about, or have I got the wrong end of the stick. Any comments please?

I will be watching this with interest, I want to know myself how we can get a 20cc petrol motor under 82dB.

RCP were I think made in Kidderminster in the late '60's early '70's if I remember correctly, I still have one of these single channel Tx's. stored somewhere. At the time there was a very small model shop in Hereford run by an Ian Mowbray and I am sure he had something to do with RCP but in what capacity I have no idea.

Denis, interesting stuff as I believe this is the first time I think I have seen anyone saying they have achieved the BMFA 82db, just one question please what was the make and capacity of motor.

Rocker it's a good job your club has a no noise restriction as my friend and I have been trying/testing home made and bought mufflers/canisters for a Zenoah and a DLA 30cc engine for some months as our club has a strict 82db noise restriction. You name it we've tried it, got to 84bd (homemade) and that's it. I know noise in the air is a different matter but no pass of the 7mtr/82db limit means no flying. We have concluded so far that all home made or bought mufflers need to be far bigger that what is on offer over the counter . Marcle LMA this weekend a trader was selling Chip Hyde canisters which as they are made in the USA seem to working to getting under 90db, ask me how I know as we bought 2 at Cosford. We are using a calibrated BMFA approved noise meter for our tests. Good luck.

Exactly my experience except my tests have been done in the middle of a 14 acre field. Good luck with your home made one though!

Kim. I agree about the stalled prop, only thing is in our club until you pass the BMFA noise test on the ground I can't find out what it's like in the air. No one in the club fly's petrol. I agree that the canisters need to be as big as possible, I have been working on 8 times the volume of the engine i.e. 20 cc engine can should be 160cc but this is far to small I think. Homemade cans are 300x50 mm plus a header pipe made from 22mm s/s and approx. 500mm long soft mounted outside the fuselage as this is a retrospective fit..

It would be interesting if anyone has actually put a noise meter on one of these 'cans' as I'm afraid 'subjectively' does not 'cut the mustard' with our committee, thx for input though.

Watching this with interest as our club works to the BMFA noise limit of 82dB from 7 meters, left, right, back and front etc.no pass no fly, (shouldn't we all?) There does not appear to be any after market silencer/canister out in model land regardless of price, which will give these results and no one supplier would give any guarantee that their silencer/canister etc will get down to this noise level, saying there are to many variables to consider, which of course there are. My winter project was to make some canisters for my Zenoah 20 and DLA 33 petrol motors and it has been a revelation how difficult it is to get down anywhere near 82dB. I am currently on my 5th canister for the Zenoah and cannot get anywhere near 82db from the front the rest is okay. One bought canister from Cosford (Chip Hyde and cheap)has been tried on the DLA, 96dB all round, but as I say it was worth a punt. You name it I've tried it, props revs soft mounts etc, so any input suggestions gratefully received. Even set it up on the Workmate to eliminate airframe noise.

alex nicol. Prop was a 17x10 Master, bit of a bodge in the hub for the bolts as the hub is not really designed for that type of fitting. Still to noisy though on a bought canister.