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Member postings for Roger Dyke

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

Thread: Small engine tick-over
03/09/2019 16:45:31

John, JD8, Jon, and Denis,

Thank you all for your valued replies. It looks like I'm probably on the money then. That's good news.

Denis: I am using a 9x4 instead of an 8x4 to try to keep the revs and noise down. It also appears permissible on the manufacturers instructions. I remember years ago using the engine with an 8x4.

03/09/2019 15:14:15

Hi All,

I have an old Enya 15 III glow engine which is in very good condition with decent compression. I have recently had it all apart, cleaned everything and reassembled. Fixing it to the test stand and running it I have made the following observations:-

Prop - 9x4 Fuel - 5% Nitro (9x4 prop is for intended use)

Max revs - 10400rpm Tick-over - 2900rpm

Question: What would be the lowest reliable tick-over speed you would expect? I have heard people claim 2000 - 2200rpm but if I reduce mine down to anywhere near those figures I cannot rely on that it won't quit.The tick-over I have is solid and even. If I reduce it more it is still stable and even, but occasionally it will quit. It may be after a few seconds or it may be a couple of minutes but it will definitely quit. I have very carefully tweaked the settings but cannot improve from the figures I have.

Am I missing something, or do smaller engines warrant slightly higher tick-overs?

Thread: OS 40 FP Mixture problem
30/08/2019 12:56:40

Jon: The model has had 21 successful flights to date, starting in April this year. With hindsight and listening to all the posters, I may be guilty of backing off the main needle too much to prevent against quitting in flight. I'm still going to try out a few of the posters suggestions though.

30/08/2019 12:28:14

Nigel: Tank and plumbing 100% and checked, and is only a few months old from new. I have also tried the 1/4" fuel tube trick on the needle valve (which seemed to be okay without).. I have used a Model Technics Firepower 5, and a OS #8. I have just sent away for some Enya 3's which I'm going to try. Thanks for the benefit from your own experience.


Edited By Roger Dyke on 30/08/2019 12:29:18

30/08/2019 11:17:14


1) I was thinking about trying the 10x7 but thought that it would have similar loading to the 11x6. I do not really want the extra speed from the increased pitch. The 10x6 would give me higher rpm (more noise).

2) I don’t have any 10% fuel to try and do have to send for my fuel by mail order. I’d rather hang back on that for the moment.

3) That’s an interesting idea to limit the throttle servo throw but would rather keep everything as standard as I can.

Denis: An easy one to try (which I will) but don’t want to leave it that way.

Simon: An interesting solution but don’t want to go to drastic measures just yet.

Paul: Both idle and main adjusters are working fine. I don’t think that I have reached the stage yet that I have to remove the engine. I am only talking a minor problem here and if I have to live with it, it’s okay.

Engine Doctor: Thank you so much for the explanation and all that information. I hadn’t given a thought to ‘puddling’. I would think that puddling could happen at mid-throttle too. I rather favour that this could be my problem. I will try out what you recommend. The engine is not spitting fuel from anywhere. In fact it’s the most clean running engine I have.

Cuban8: Thank you for the information.

Braddock VC: I have tried the silicon tubing dodge on the needle valve and treble checked the air bleed hole. Everything okay.

My thanks to you all.

30/08/2019 08:00:04

Cuban8: I do realise that the 40 FP is not a complex piece of machinery which will perform perfectly no-matter what the conditions at all throttle openings. It is quite a simple engine and I fully accept that. I was just curious as to why it chooses to 4 stroke at mid-throttle openings. Perhaps I have really answered my own question.

30/08/2019 06:57:52


The idle is set perfectly and the idle is no problem. I do realise that the idle speed is set by the throttle opening and not by the bleed screw. I have not tried 10% nitro. I use 5% on all my engines which seems to be fine although I do take your point that it could probably make a difference. I do not have any 10% but probably something to try for the future. Regarding the plug, I am going to change to another type on my next outing.


I can see where you are coming from, but this engine is 'as new' in condition and has been stored well with absolutely no signs of corrosion, rust, flaking, or oxidisation. It's probably the best engine I have for condition.

Thank you all for your very helpful replies.

29/08/2019 22:02:58


I can't lower the tank as I mentioned in Cuban8's reply. I could try it without pressure though. I do like the idea from Cuban8 and yourself that maybe it needs to be leaner at full revs. Perhaps I am being over cautious.


I fully understand that the idle has no control over the mid range mixture. I was just pointing out that the engine seems to run absolutely fine at minimum and maximum revs. The fuel is good and quite new (works okay in other models) and the engine has had two new glowplugs in it.

29/08/2019 21:26:13


1) Full revs leaned out spot-on. Always check every time I fly.

2) I was thinking about using an Enya 3 and have sent for a couple.

3) Tank height looks fine. It cannot go lower anyway as it sits in the bottom of the fuselage.

4) Hadn't thought of trying it without exhaust pressure. Might try that.

5) Carb needle is perfect.


1) I know that the air bleed idle screw doesn't control the rpm, but it does control the rich/lean idle mixture. It is set okay for a steady idle.

2) Enya 3 glowplugs on order.

Paul: I really like the old OS FP engines too.

John: I really don't want to go to a 10x6 as I'm trying to keep the rpm down.


1) Airbleed hole is perfectly clear. Checked again last evening when I took the carb apart.

2) I may try a 10x6 next time I go flying but I don't really want to go that way if I can help it.

3) I do believe that I can get down to 2000 rpm but prefer a little more.

4) As mentioned earlier, the engine is in excellent condition and the main needle is fine. There is no "O" ring on the needle. Just where the carb joins the body (and it's okay).

I have a feeling that it may be over-propped although the paperwork supplied with the engine does indicate that it's suitable for a 11x6 prop. Also I will see what difference an Enya 3 glowplug makes (if any).

Thank for all your replies.

29/08/2019 19:42:19

Hi Alan: Thanks for your reply. The whole engine is spotless. I've had the air-bleed screw in and out several times and the air hole is clear. As mentioned in my previous post, the idle is fine at about 2500 rpm.

29/08/2019 18:58:21

Hi All,

I have an old OS 40 FP in my latest model. The engine was purchased in the early 90's but has only had about 20 hours use. It is in perfect condition and has excellent compression.

My problem is that at mid throttle it runs rich (4 stroking), and upon increasing the throttle takes about 7 or 8 struggling seconds to increase back to peak revs again. At peak revs it is fine and also fine at idle. It is just the pick-up from about half throttle that is the problem.

Peak revs were set with it 2 stroking, with 2 or 3 clicks backed off to slightly rich. Idle is also set for a constant 2500 rpm.

Prop = 11x6. To keep the rpm down to 10k to reduce noise.

Fuel = Model Technics Laser 5.

Glowplug = OS # 8

(The above set-up works fine with my Irvine 40)

Any ideas?

Thread: Orange Receiver Telemetry Problem
18/08/2019 09:44:29

When the Spektrum receiver A antenna receives a bad packet, it is recorded and then looks to the B antenna to see if the B antenna has received a good one. If the B antenna has also received a bad packet, then that is recorded and also a frame loss recorded (F). The problem that I was having with the Orange R620X receivers were sometimes I were getting more Frame losses (F) than all of the recorded A and B packet losses added together. How can that be? I have been in touch with HK for an explanation. They said that they would find out and get back to me. It has now been a month and have reminded them twice. Still no answer. In saying all of the above. I have never ever had any Holds (H) recorded or had any sign of glitches or non-control. The receivers have behaved perfectly.

Edited By Roger Dyke on 18/08/2019 09:45:57

17/08/2019 22:43:35

Hi Trapper,

I have been using firmware version 2.01 for a while now in my DX6 and it works fine with my Orange R620X receivers. I'm not sure what the A, B, and F returned numbers mean from the receiver and am currently in a discussion with HK about them. They don't seem the follow the same criteria as the Spektrum ones. No answer from HK yet.

Thread: Understanding the numbers....
07/07/2019 19:01:08

Steve: I think you are right. I can make no sense out of the results whatsoever.

Thread: Orange Receiver Telemetry Problem
06/07/2019 17:05:40

For more information see "Understanding the numbers" under the Spektrum/JR section.

Thread: Understanding the numbers....
06/07/2019 15:55:54

Just for interest....

I have just done some experimenting in my house with the Orange receiver and satellites on the kitchen table.

Spektrum DX6 TX and Orange R620X receiver with two R110XL satellites connected.

After binding them all together, I walked to another part of my house, sat down and switched the TX into range check. I then pressed the reduced output power button and held the TX at slightly different angles and started recording the telemetry results for a minute or two. I did this several times and two sets of results were of particular interest.

1st set) A - 675, B - 30, Frames - 1191

2nd set) A - 471, B - 15, Frames 514

As you can see from above, the recorded Frames number was larger than the total of the A and B fades added together. Surely this cannot be (unless the fades from the satellites are not recorded but included in the frames).

Any explanation?

I have just tried it again without the satellites, and the Frames were still a bigger number than the A and B fades added together. Weird….

Edited By Roger Dyke on 06/07/2019 16:09:43

Thread: Orange Receiver Telemetry Problem
06/07/2019 09:29:41

Maybe.... I seem to have put so much effort into this topic so far that I'm starting to feel a little bit mentally exhausted. For all my efforts I seemed to have gleaned very little information. Even directly from HK support. It's technical information I'm after, like was given in my other thread by the Spektrum software guy. That was 1st class. I don't seem to even be able to contact the Orange company at all, let alone their technical support. perhaps I'm looking too deep. I suppose as a retired electronics design engineer I probably would.

Thread: Understanding the numbers....
05/07/2019 16:41:11

Steve: I do have the TLM viewer and have been doing nothing else but analysing the return data for the last week. What is does tell me is that on the Orange receiver, the 'A', 'B', and Frame data tend to follow a very 'similar' track upwards, whereby with the Spektrum data you can clearly see where a frame count increments.

05/07/2019 16:35:23

Steve: Thank you so much for that. It is much clearer now and makes sense. That fits in exactly with the pattern of numbers that I have been receiving from the Spektrum receiver. It's a pity we cannot get the same depth of information from Orange or HK about their receivers.

Don: I too was wondering if the numbers returned from the Orange receiver have a different explanation. Up to now I haven't a clue. I find it hard to believe that the Orange signal receiving circuitry and control software is several magnitudes worse than Spektrum's with all the technology we have in this day and age. As I previously mentioned, I wonder what the numbers look like when using an Orange telemetry transmitter.

05/07/2019 15:04:21

Don: I can't argue with any of that. I have done exactly the same and have been systematically changing mine too. I am still intrigued though as to what the telemetry numbers actually mean from different manufacturers. I would like to think that they would publish an explanation chart or something but maybe that is too much to ask.

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