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Member postings for Engine Doctor

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

Thread: The Repair Shop
25/09/2019 08:23:47

Providing they don't get a Mike Brewer type to present itangry It will survive

Thread: 2019: Britain's new air disaster
24/09/2019 12:17:45

I wish the media would stop "Droning " on about it at the slightest excuse !

Thread: Collapse of Thomas Cook
24/09/2019 12:03:35

School children on strike over climate change !!!! How hypocritical is that ? Virtually all of them have to have a lift to school in the family Chelsea tractor and as already said , wouldn't they complain if they didn't have their holidays abroard . Little darlings don't you love them? The fault lies with the parents spoiling them . Am I being too hard ? may be a little but the University of life does that

Children have been duped/ used as a tool by climate change activists .

Let children walk or cycle to school as we did and that would be a start . Parents will argue its a different world now with more cars etc etc . Yes there are more cars because they are taking taking children to school ! Aren't the roads quiet during school holidays ?

Population explosion is the real threat . Food fight will be next , not the bun throwing type but real fights as food supplies become stretched .

Thread: Have You Ever Noticed...
24/09/2019 11:31:04

Its the main reaspon I dislike ARTF models. all clones of one another ! making your own colour scheme makes a model special . I was given a Cougar 2000 a year or so back . It had some damage so I stripped and recovered it giving it a totally different scheme. Its still just a Cougar but stands out  head and shoulders above other cougars at the club 

capture cougar1.jpgcapture cougar 2.jpg

Its now called "A Cougar Brexit Special" Fly the flag smiley



Edited By Engine Doctor on 24/09/2019 11:36:11

24/09/2019 09:53:15
Posted by CARPERFECT on 23/09/2019 20:44:06:

Looking to replace the front bearing on my fs 70. is the bearing a sealed bearing ?


While your at it replace the rear bearing as well. Even tiny amounts of wear will change the valve timing enough to cause a drop in power. Rear bearing wear can be detected by holding prop atop and bottom an rocking back to front it,any play will be felt. Is it  a sealed or sheilded bearing ? Sheilded have a metal cover to prevent dirt from entering bearing while sealed have a rubber coated plate that is a actual seal on the rotating center of the bearing. Only the outer shield or seal is needed . Wash out grease and lubricate with appropriate oil before fitting.

Just replace like for like.

+1 for Simply Bearings.

Edited By Engine Doctor on 24/09/2019 09:56:59

Thread: MDS N/V
21/09/2019 09:50:33

Look up a local bearing factor as they also supply "o" rings and take the old ring to them for measuring . Failing that it's just luck trying the classifieds etc. I have been looking for a piston for the MDS 148 for months now but no luck but things like "O" rings and bearings are generic parts so you should be in luck.

Thread: Laser Engines - Technical questions
19/09/2019 10:46:43
Posted by Jon - Laser Engines on 18/09/2019 21:55:10:

Nice one Chris.

Now you can see that fish you will always hear it

And no, i dont expect else anyone to understand that

Obviously from the Eric Cantona school of thought smiley.

Thread: Are all chargers unreliable?
19/09/2019 10:35:05

I just use Imax B6 off of E-Bay . Charge virtually any type of battery we use and lipos up to 6s .Cost around £13 each and last for years . Just had to replace one though after letting the smoke out after shorting it while being distracted !!!angry . Trouble with the multi channel chargers , if one channel blows then the whole lot is rubbish . The newer versions of the B6 have been improved to 80W from 50W

Thread: Irvine 61 new bearings
18/09/2019 09:57:23

If you try the tap method ( not recommended ) make sure you screw the nut on the crankshaft to protect the thread.

Heat will release it but can often anneal the alloy if your not careful and get it too hot . The prop driver is then soft and can spread when used losing grip and come loose.

A puller is the only way to safely remove a tapered collet type prop driver. They can be very stubborn but quickly surrender to a puller. Pullers can be found on eBay for around £5 and don't take too long to arrive.

Bearings are available from many sources an Simply Bearing are IMO the best and quickest suppliers. Visit their website and it will show you how to measure the bearings . You will need a Vernier gauge . Model fixings may have the engine on their list so measuring the bearing will not be necessary .

Making gaskets is easy and my preferred material is thick brown envelope paper.

18/09/2019 09:50:57

Sorry double post ?

Edited By Engine Doctor on 18/09/2019 09:58:56

Thread: Glenns models cap 232
14/09/2019 09:34:56
Posted by Rich too on 13/09/2019 12:34:16:

As I understand it, that is highly unlikely. All my planes have twin battery set ups, and i've never had an issue. wink

Hello Rich too.

That the trouble we never have an issue until we do however unlikely smiley. Some years ago twin battery set ups were virtually unheard of and considered by many as "over the top" . Fine until you experience a cell that goes open circuit then it all makes sense. Its worth the little extra time and effort if the model is a bit larger or expensive than your normal hack.

Over the years I have seen and experienced a lot of "The unexpected" occurrences that can often re-kit a model and battery problems from in-proper charging and neglect to new packs failing have featured heavily so a backer system is a simple and effective bit of protection JMO and each to their own .

I now make my own battery backer that cost just a few pence and are very simple, 

The Diodes will reduce the voltage very slightly up to 0.5 V .Also fit twin switches as these have bee known to wear and become erratic or un-reliable .

diode y lead.jpg


Edited By Engine Doctor on 14/09/2019 09:40:39

Edited By Engine Doctor on 14/09/2019 09:45:17

13/09/2019 12:06:00

The battery backer in your link will do the same as a "Y" lead but will incorporate diodes to stop a faulty battery discharging through the good one as can happen with a normal "Y" lead. SM services sold a similar item some years ago but are no more .

The Glens Cap is nice plane to fly. Good luck .

Edited By Engine Doctor on 13/09/2019 12:06:55

Thread: HK Skycat?
11/09/2019 14:33:10
Posted by SIMON CRAGG on 11/09/2019 11:00:45:


Not having got my Flycat yet, I don,t know if it will be noisy or not.

Good info on balancing. Thx.

Before removing the fan first try simply turning the adaptor and fan on the motor shaft a 1/4 turn at a time as this often cures the screaming out of balance noise.

11/09/2019 09:57:37

Re the noisy EDF units, try balancing the blade. This makes the units a lot smoother and quieter . I tried this on the Hk Vampire and it sounds like a proper jet. You will need a decent balance device capable of balancing small units. I bought one fro Rapid RC cost about £10 and well worth it . Various tutorials on YouTube re balancing EDF units.

Thread: Covering with Solarfilm
10/09/2019 17:27:42

Try "Cover grip " by Deluxe Materials. It's still available and JMO is far better than Basaltic .

Thread: Perry carbs.
04/09/2019 12:04:08

H The Perry carb should have a spring under the fuel needle . The mark on the top is the mixture indicator for idle mix . Turning the disc ;left or right increases or de-creases the idle fuel mix . The bigger Perrys I believe had a "+ or - " molded into the carb body see link . Turningthe disc clockwise leans the mix and anti-clockwise richens the mix . Adjustment is very fine so go slowly .

Thread: Shortage of 35% (100cc) aerobatic kits in the U.K.
04/09/2019 11:51:33

Give Justin at Rapid RC a call . He had some large kits at the Nats . He will get one for you if he hasn't got one and wont B***S*** you if he cant get hold of them.

You could also try Probuild . 

As already suggested the Large 25% and above side of the market is the minority of a minor market . 

good luck with your search.

Edited By Engine Doctor on 04/09/2019 12:10:25

Thread: OS 40 FP Mixture problem
30/08/2019 08:56:32

The air bleed carb should work fine through the range on an FP engine. An odd cough at mid range can happen as the FP's carb is a simple bit of kit. Assuming your fuel and glow plug is good then the trouble you are experiencing is caused by fuel collecting/puddling in the crankcase while engine is idling. This can be  caused by an over rich mixture on the main needle as well as the air bleed setting.You say your richening the mixture two or three clicks at full throttle ? Try one click rich . If it exhibits any symptoms of  rich running at full throttle then it will be too rich at idle This excess fuel puddles in the crank case due to the inefficiency in the transfer process at low revs . . As soon as you open the throttle the engine tries to transfer/scavenge the fuel in the bottom of the crankcase as the system efficiency increases to the cylinder and the rich mixture cools the plug often causing the engine to cough and splutter or stop . The mixture should be est as follows .Set the air screw /air bleed screw half way across the opening , this can easily be seen. Start engine and when warm run at max revs and adjust mixture on main needle until it starts to go lean then richen the mix enough for normal Wide open throttle running with no excessive smoke etc. probably one or two clicks. Now close throttle adjust the idle mixture screw by allowing the engine to idle for ten seconds or so at an acceptable speed , usually around 2000 rpm ish . Open throttle smartly , don't snap it open . If engine hunts with little or no smoke then mix is too lean so screw In air bleed screw half a turn .and re-try. If engine coughs and splutters with lots of smoke or fuel being emitted from exhaust then its too rich. so open air bleed screw half a turn and re- try.. Continue until running is ok

If after a few cycles of this the problem persists then there is another cause

If your engine spits any fuel from the rear of the prop driver then the main bearing bush is probably worn/damaged and a rich idle setting would be needed to maintain Crankcase. pressure . This can happen after a long lay up if old fuel was left in case and any acid formed attacking the shaft or bush.

Hope you get it sorted as the FP is a good reliable engine if not the most powerful .

Edited By Engine Doctor on 30/08/2019 08:59:44

Thread: Max Thrust Riot - Upgrades
29/08/2019 11:16:55

Past experience has shown that if a pushrod is bent then the only cure is to remove and straighten or replace the rod . If the outer was bent during fitting causing the resistance then that will have to be straightened or replaced. If oil does free it up then as the oil oxidises the friction returns so removing the rod is probably you best option in the long run. If you do remove the rod and clean ,straighten or whatever needed then wipe lightly with some silicone grease on reassembly . If the rod and tube are damaged you could replace the lot with a snake ? They deal with bends much better than rods but check what is causing the binding first as all the Riots I gave dealt with had very smooth control rods. Good luck.

Thread: Skyfarer power...
28/08/2019 10:10:35
Posted by paul d on 28/08/2019 08:17:26:

, be interested to see how the rudder are linked.

Simple these days by using micro servos ,one on each rudder connected with a "Y" lead

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