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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: Judder on all servos with DFT module
09/12/2019 11:59:04

Can anyone shed any light on the following ? I recently obtained a FrSky DFT Futaba Tx module . I don't need or want any telemetry and am using a Vr8 11 Rx

Have set the switches on the back according to the instructions for use with this Rx , Binds instantly but all servos judder as if the frame rate is wrong . I have checked back on much earlier post and there were some dodgy modules in early batches. This one I was assured is from the later batch so in theory should be ok . Were there any fixes found ?

Thread: Can I have two Life batteries powering my Futaba receiver?
09/12/2019 08:58:00
Posted by Piers Bowlan on 23/09/2018 11:47:30:
Posted by Engine Doctor on 23/09/2018 11:31:09:
Posted by Allan Bennett on 22/09/2018 21:10:21:

A simple way to prevent two separate power sources interfering with each other is to simply install a Schottky diode (with a suitable amps rating) into each +ve battery lead before they go into the Y-plug or into two separate receiver inputs. Then if one fails in some way, the other will not be able to feed power into the duff one, but will continue to power the receiver. I've got such a system in several of my aircraft -- fixed wing and helis -- using BECs rather than batteries as the power sources. I've also added an LED to each 'channel' to give an indication if one of the power sources has failed.

yesThats my preferred method too. I also use a separate switch for each battery fitting the diodes into a "y" lead between the switch and Rx .

OK, so to ask a silly question, what is a 'suitable amp rating"?

I use schottky diodes 1000v 10Amp . You can buy them online 10 for a couple of pounds.

They will lower the voltage of a pack by about 0.25 to 0.5 v but if you use 5cell NiMh or two Life cells there isn't a problem.

Thread: DB Hurricane paint and finish.
08/12/2019 08:06:54

You can now get water based Evo Stick contact adhesive. Probably more expensive than copydex was but don't know if copydex is still available. There is also a similar product to copydex used by carpet fitters , might be worth investigating ?

Edited By Engine Doctor on 08/12/2019 08:07:35

07/12/2019 11:47:32

yes +1 The foaming glue works well on veneer and any that foams out can easily be sanded off when cured . Will need a plastic sheet with heavy weights spread over area to hold it down as its very powerful when it expands .

Jon Be careful with the CoG on the DB Hurricane . I built one some years ago and the CG was exactly as per the plan . First flight proved otherwise . Needed moving an inch further forward for pleasant flying. 

The full size was I believe the same . I have read  it somewhere in the past that the first Hurricanes that were delivered were just about flyable due to a rearward CoG and one officer refused to fly it in service until it was corrected . The article said they all had a large lead weigh attached to the firewall and an extra trim tab to counter this .

DB was was a stickler for copying the full size .Everyone I know who has had a DB said that they had to move the CoG forward from that on the plan . As you say wing loading isn't too much of a problem with such a large wing although the U/C mount can be loosened in a less than perfect landing if not built strong . The one I built had the built up wing and the U/C mounting  was incredibly strong after all the mounts were strengthened with tri-angular stock .

Good luck wit it and hope you get away with sticking the veneer down .

E.D.

Edited By Engine Doctor on 07/12/2019 12:01:37

Edited By Engine Doctor on 07/12/2019 12:02:49

Edited By Engine Doctor on 07/12/2019 12:06:28

Thread: Valve work
06/12/2019 14:54:28

Hello Winco . Sorry for late reply but trying to sort out the club subs renewals for 2020 with the added CAA and optional card business !!!

Cutting a slot is a good method especially if the bolt is knackered anyway and its accessible . For the head bolts use a good quality HSS Allen driver  link . They are sharp and grip far better than ordinary allen keys . Clean out the socket in the bolt head before inserting the allen driver so as to make sure the driver fits right into the socket . An old sharpened small allen key is ideal for this as they are pretty useless for undoing allen screws. Also a sharp tap on the end of the allen driver with a light hammer usually loosens them . Dont forget to undo and do up diagonally and dont over tighten them . Do replace any damaged/rounded bolt with a decent quality bolt when re-building.

Good luck and let us know how you get on

E.D.

Edited By Engine Doctor on 06/12/2019 15:05:34

Thread: Radio Queen ailerons
02/12/2019 17:23:18

Why ?

Thread: Valve work
02/12/2019 11:09:22

You could try squirting some Plus gas around the valve to get it moving .Cam followers are prone to getting stuck if the engine is poorly stored for a long time and will hold the valves open when the cam pushes them up and they stick. Agian a squirt of plus gas will usually free them with a little finger pressure . It would be wise though to strip off the head and remove valves to clean the stems and seats .Once the head is off remove valve collets in a big plastic bag . That way if you slip you will be able to find the collet.. To clean the valve stem and head I put it in an electric drill and use an old razor blade etc to remove any thick carbon then fine wet and dry paper to finish off . I use fine valve grinding paste thinned with either a drop of paraffin or thin oil to re-seat the valves. You can test the seat quickly by putting a few drops of thinners into the inlet and exhaust and check for leaks . As the valves or follower are are stuck I would also check the rest of the engine for any gumming or corrosion as this can Kill an otherwise good engine in seconds . A quick look in the cam box and in the back of the engine (take off the back-plate) and you will see if there is any corrosion to worry about . Its worth checking as the 80 is a powerful old lump and generally good runners ..

Edited By Engine Doctor on 02/12/2019 11:14:28

Thread: A new caption competition - winner declared!
02/12/2019 08:50:45

"You climb over and get it !" "NO you climb over"

Or

Someones fly tipped and old airframe over here !

Thread: Medway MFC indoor flying Sun 8th December . Gillingham Kent
01/12/2019 19:57:30

Medway MFC indoor flying this coming Sunday , December 8th 2019 at Medway Park Leisure Center Gillingham Kent ME7 1HF For more details go to ; http://www.doddington-kent.org.uk/MMFC/ This will be the third indoor session this autumn /winter Further sessions will be held on the second Sunday of each month through to march 2020 Sessions run from 10 am to 3 pm Costs £7.50 to fly for adults (children get a reduced rate). £1 spectators. BMFA membership/ insurance required to fly. Please bring BMFA cert. There will be a free bring and buy table , just put a donation in the Air Ambulance box if you sell anything, and a raffle . All profits go to our club charity the Air Ambulance Kent,Surrey and Sussex. please come along have a good fun day and help support a worthy charity . In the last year we have raised £1769 for the Air Ambulance so pleas come along and support a worthy cause .

Thread: The Gov't, CAA, BMFA & UAV legislation thread
30/11/2019 09:55:13

As per Ken Andersons thought Dept .Too many barrack room lawyers over analysing and confusing readers Lets have a simple how too from the likes of Andy Simmons and lock the thread

Thread: 'Starloc' adhesives.
27/11/2019 14:42:58

I used to use there stuff and liked the glues etc but many flyers I have spoken to tried ordering by post and never got any goods or refunds . Steer clear  for now and buy from other dealers .

You can buy decent Cyano in 50 gram bottles from Tool station About £4 a bottle . They only do a medium and thick though

Edited By Engine Doctor on 27/11/2019 14:45:51

Thread: TX stick/gimbal direction guide plate?
27/11/2019 09:05:29

. You can achieve the same function on other simpler computer sets by just set end point adjust to 0% or switching required channel/s to Off or Inhibit.

Thread: Hobby king delivery charges
22/11/2019 17:37:10

The rules around posting batteries are mad . If I go to the post office and try to post some batteries they refuse point blank no matter what type of battery . Then I order some batteries NiMh from a company in the UK and they are delivered by the royal mail with no problem ? is it one law for consumers and another for business ?

Thread: Metal Tanks
22/11/2019 17:13:17
Posted by D for Donald on 22/11/2019 11:31:37:

Thanks Engine Doc. Cant see the pics as I'm not allowed to log in the Medway club site.

What happens when you click on the link ? Its always worked in the past ?

You could try logging onto www.forum.medwaymfc.org.uk  if that works click on 

Ben Buckle designs in traditional models then onto BB Taylor Craft and scroll to bottom of page one .

 

regards

Edited By Engine Doctor on 22/11/2019 17:19:25

Thread: How do you attached to those solid inners on snakes?
22/11/2019 11:16:33

I haven't seen those solid snakes around for years . The inners are very handy for threading bits through wings or fuselages etc . Do you need that particular type ? Newer types with a hollow inner are easier to secure linkages and are easier to find . Golden rods do a lighter weight snake for lighter models in a red outer yellow inner combination .

PS just read the post with pics link showing a crimped end which is probably best way to secure .

 SJ Do you use a dedicated crimping tool or will a wire/plug crimping tool work ?

 

Edited By Engine Doctor on 22/11/2019 11:21:23

Thread: Metal Tanks
22/11/2019 11:05:02

Hello D for D . As in other post  just make tanks with a butt joint , no tabs needed. Copper will usually occur with glow fuel that contains Nitro Methane , the high the content the quicker the errossion, If that's the correct term , of copper . It will dissolve the copper from bass tube leaving a brittle porous tube of blackened Zinc . Any fuel residue left in the tank will go a dark green colour . Never experienced it it with diesel fuel though .

Some pics of making tin tanks here . Hope its of some help . When you have finished soldering and testing the tank half fill it with some cellulose thinner to dissolve any flux/resin that can block fuel tubes . |Guess how I found out about that .

Edited By Engine Doctor on 22/11/2019 11:06:26

Thread: Best Heating Option For Your Hobby Shed
17/11/2019 15:35:57
Posted by leccyflyer on 16/11/2019 17:47:05:

I'm assuming that I have to arrange for the exhaust to exit the building and don;t really want to drill a 25mm hole through the stone work, but could take it out through the perspex glazed side frame of a door. I thought I'd replace one panel with timber with a neat hole and fill the gap with something fireproof/heat resistant. Any guidance on suitable materials from those who have installed these exhausts through shed walls and the like?

The exhaust pipe does get really hot so drilling a hole through the brick would be your best and safest option removing any worry of damage to door frame or possible fire . You can buy extra lengths of exhaust tubing quite cheaply.

A good sealant for any joins or filling in around pipe and brickwork would be car exhaust putty that sets hard when heated.

If I had the room I would run the exhaust through an old radiator that would act as a silencer and give extra heating that would otherwise go to waste .

Thread: Foam Model Repair
15/11/2019 11:03:10

A bit of bad luck there .Looking at the pic I would if possible, in addition to the foam replacement fit a carbon spar/tube into the wing , extending as far as possible into the wings and through the repair as you can without compromising the retract units . As the wing is cracked right on the fuselage joint it will have to support the flying loads so a spar might help stiffen a compromised wing.. Good luck and show us any repairs as I am sure plenty of us ill be interested how you get on .

E.D.

Thread: How to remove glue from ARTF before recovering....
13/11/2019 09:14:45

yes + 1 for Acetone .

Thread: Help! Twisted wing
12/11/2019 10:47:51

Hello Phil . just a thought but when you shrunk out the diagonal wrinkles did yo do both side of the wing ? the reason I ask is that I told a club member how to do this some time ago and they said it did'n't last long so I said come round to my place and we will sort it . I did the top of the wing while he held it then said keep the twist on and turn it over so that I can shrink the other side and he had a light bulb moment enlightened.

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