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: Sign of the times - funnies|
President Trump is talking to the nation telling them that they should be making more things at home in the USA.
he said " Why , this morning I looked at my television and it had "Built in antenna " on it , I don't even know where that is !
|Thread: What Traders are still offering Mail Order? Services?|
All our local shops are doing online and mail order. Rapid RC .Model world UK and Weston UK. Contact details can be found with a quick Google
One of them told me they were also doing local delivery to the north Kent area while allowed to.
Keep well, keep safe and keep your distance!
|Thread: Vibration absorbing engine mounting|
I know meanwhat you but you say certain revs so vibes are from something out of balance and rev critical. I have over the years had engines that are just rough running out of balance engines ,usually the cheaper brands. No amount of prop balancing would help. Change engine and hey presto , a quiet model ! Even some props in years gone by were so bad that balancing was impossible.
I think it really comes down to Individual model engine combinations / actions to get quiet drum free model.
Edited By Engine Doctor on 30/03/2020 10:31:36
Don't bother with those mounts they will allow your engine to wobble all over the place. We used to use them years ago on backplate mounts on fun fly models like the Panic but they were made from a hard rubber so didn't wobble as much. If you take time to balance your prop properly , ex pun , it will greatly improve any vibes/drumming . Saitos are pretty quiet and smooth running engine. I have used rubber Rawlplugs to hold Mount to the firewall but no noticeable difference. Dubro aluminium engine mounts are very good with rubber isolation but expensive. A decent covering like solar Tex if available or oratex if you can afford it will also help.
Edited By Engine Doctor on 30/03/2020 10:20:21
|Thread: Can I or can I not fly?|
Why are even having this conversation? and why are some confused ?
Essential travel only for needed shopping or medical supplies . Limited exercise alone or with your household members.Only go to work if its an essential job. Simples
Very easy set of rules to understand really . Why even ask if its ok to go flying? The fool that does will be the first to moan about getting fined and causing our stre-e-e-etched emergency services even more grief
|Thread: 2 vintage engines, what makes please?|
I had a mighty midget given to me when I was kid and reckon the second engine is a Mighty Midget. I distinctly remember it had Mighty Midget engraved on the transfer port . The crank pin was loose and Alan now owner of Weston UK fixed the crank for me . Never got it o run and cant remember what happened to it . The 4 bolt ?
Edited By Engine Doctor on 22/03/2020 10:54:20
|Thread: Covid 19|
Have you noticed how quiet the skies are. Haven't been this quiet since the 9/11 attack . I live on the flight path into London and the skies are eerily empty .
As already said sounds like the diaphragm in the carb has gone brittle or has a small hole .Walbro or copy repair/overhaul sets are available on e-bay at a fraction of Walbro prices and are very good. The modern petrol with ethanol will eventually make the diaphragms go hard and brittle .
|Thread: Has Your Club Made Any Decisions Regarding The Coronavirus?|
Well done Gary. The trouble is finding any sterilising wipes or sprays to use ! All cleaning sterilising items shelves at local stores are bare here in south east , not a piece of soap to be found! Lady on the checkout said to us "I wonder what people did for washing before this ,didn't they know about soap"
We have cancelled all indoor and outdoor organised meetings until further notice. The flying field is still open to members for normal flying as it's easy to distance from other clubmates. As already said when a full lockdown is brought in then the field will also be closed.
Just wondering how I'm going to cut the long grass when we can finally get back out ?
Good luck to everyone and keep well.
|Thread: Motor stutters near full throttle|
I have had this problem on one of my planes. It sometimes wouldn't restart after closing the throttle but would just oscillate . Problem on that model was poor quality / connection on the bulit conectors on the motor leads. Another model with similar problem was a broken lead in motor.
|Thread: David Boddington Tiger Cat|
Just looked on Just engines and ASP 21's are now out of stock with little hope being re-stocked . You might be lucky and find one in stock somewhere.
Hopefully their new range of Taiwanese engines will grow as they only stocking a 15 and a 32 at the moment.
|Thread: Saito 300 Twin|
As your Saito was designed for use with methanol fuel then changing it to run on petrol has caused the valves and seats to erode due to the hotter exhaust gas eroding the valves and seats . Classic cars and motorcycles suffer from a similar problem of valve seat regression due to the use of modern fuel/petrol not having any lead in it. The lead would act as a lubricant and stop the valves and the standard softer seats sticking or being damaged by the excessive heat . The cure is to have new hardened valve seats fitted that can withstand the temp of the new fuel without the lead . The bronze seating fitted in the Petrol Saito' is there for that reason . If the valve seats are not too damaged/regressed (any pictures ) then a new set of valves may fix the engine but the cure then will be to run it on methanol in future . You could still use the spark ignition with methanol for added reliability and get more power than petrol .
New cylinders for Saito' are expensive as head and cylinder is a one piece casting so fixing your engine will probably cost £250 plus Unless you can find a cheap breaker with the parts you need .
OS engines have bronze valve seats as do other FS engine makers . Not sure though how they would stand up to use with Petrol as the composition of the seat material may not be up to use with petrol unless its purpose deigned for petrol.
Best of luck with re-build
Edited By Engine Doctor on 07/03/2020 14:20:05
|Thread: Pin Holes|
Very interesting . have used it on dents in balsa but never tried it on pinholes . Will try that on next build .
Try some water based filler like polyfiller or polyfiller light . Sands really easy once dried and adheres well There are also many lightweight fillers on sale at Diy stores . If area is prone to twisting try some Ronseal Woodfill. Its a two part filler that sets in about 10 minutes a little heavier than the light stuff but wont shrink or fall out , its easy to sand and comes in white or beige .
|Thread: Hello Bedfont calling|
As per Matty B says . They are great little models but not for a beginner . If you smash it you wont get any bits . Ripmax sold all the old stock off at Wings and wheels about ten years ago. They sold them off with motor and a speed controller for about £30 . The motor is a cracker , a canned out runner with plenty of torque. As for servos any reasonable 9 gram servos will do the job . Good luck and happy landings
|Thread: SC 70 fs|
They are I believe cast into the head casting and are not removable . You may be able to get some type of thread lock , even cyano into the join and fill the leak . Its worth a try . I have never bothered trying to stop the leak in the past but may try if one come my way in the future . You may be able to find the leak by blowing air into the inlet and exhaust ports having first re-fitted the valves . The SC etc are poorly built engines compared to OS etc but generally run well enough for our needs .OS use the same type of seat but I have never found any of them to leak . If you do try to seal the leak let us know how you get on .
I backed a Magnum 160 FS twin some years ago as one cylinder had no compression and kept going out. The supplier tried grinding the valve numerous times and had a perfect seal but it still blew past the valve seats once fitted on the engine . He finally gave up and fitted another head and guess what ? That had the same problem but not as bad !
|Thread: Closed loop...|
Provide both lines are tight around the center then it should be ok . And its when rudder/ elevator is around the neutral position that flutter will cause a problem if lines are slack. When inputting control movements the pulling line will / should but enough tension to stop any flutter Unless you get the geometry absolutely accurate then the line pulling will always be tighter. Make sure that the width of the horns and the servo arm are the same diameter and that holes are the same distance from the center-line and it should work out
|Thread: DB Hurricane paint and finish.|
Hi John you can get a soft sprayed edge by using some foam edge masking strip . Its primary use is for sticking inside car door jams to get a soft edge . I used it on a yellow aircraft spitfire to great effect. Downside is its expensive if you have by a whole box . A car repair shop may be able to help with a smaller quantity .
|Thread: Whats easiest way to clean an engine without dismantling?|
A friend used to put his engines in the dish washer ! When finished he gave them a thorough run and all was well .
Health warning !!! Only try this if SWMBO is away or out for the day .
If they are gummed or siezed see post re "Jammed engines "
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