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Member postings for PeterF

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

Thread: The Gov't, CAA, BMFA & UAV legislation thread
17/02/2020 19:15:00

One thought crops up, more than 20% of the members in our club either had no DoB or a shortened first name / nick name in the BMFA membership. Despite the BMFA emailing all members with email and me doing the same (club sec) I had to chase up individual members to get the correct information. I expect that the CAA have probably been given a set of data with a lot of erroneous data in and that there will be a significant number of modellers that do not get a number because they fail the government ID verification. These modellers will not get their number in the next 7 days and will need more time. Perhaps the CAA were expecting to receive only good quality data.

Thread: 2 or 3 questions please, need some wise advice
17/02/2020 12:41:35

There is nothing stopping you using the motor you have and just putting a smaller diameter prop on to reduce the thrust and power consumption as long as the motor fits and the plane balances. With an electric motor the revs will not increase much unlike IC if that is where your experience lies. An 11x6 prop would reduce the power to around 275W and a 12x6 to around 350W on a 3 cell battery.

Thread: Balsa or Obechi
13/02/2020 16:32:14

Purchased some ammonia solution from my local hardware shop in December for bending balsa sheet. I had never used it before in 20 years of modelling. I poured a liberal dose out to wipe over the sheet and had to make a hasty retreat from the workshop. Live and learn.

Thread: New 78" Vulcan for twin 90mm DF
10/02/2020 17:08:22

The second wing has now been completed to the same stage, sheeted both surfaces, servo mounting rails installed, wing tubes cut and checked. I have added another photo of the wing retention system before sheeting with the aluminium plate bolted into place on both sides of the wing joint. As noted previously, I have followed the photo instructions. The oddest job was gluing the wing frames to the fuselage and sheeting over everything, then cutting off the wing panels afterwards, first time I have ever done anything like this. From the photo below, the wing joint is between the second and third ribs, which are spaced a hacksaw blades width apart with some thin balsa sheet, ready for cutting after sheeting is complete.

Ready to add the leading edges, wing tips and the control surfaces.

dsc08723.jpg

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Thread: Scratch built foam/depron indoor models, lets see them.
09/02/2020 17:07:50

Here is my Etrich Taube. I can not recall how long ago I built it, the innards came from a Parkzone Ember. I have a 2m wingspan version I have flown outdoors for perhaps 15 years so I thought I would make an indoor one. I printed out a 3 view, tacked it onto some depron and cut it out. The wing was placed over an aerofoil shape and held down with some paper and gently heated to give it the under cambered section. The tips were then heated and lifted per the reflex on the full scale. Coloured with felt pen. Flies lovely, 10+ minutes on a 70mAh battery.

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Edited By PeterF on 09/02/2020 17:27:12

Thread: New 78" Vulcan for twin 90mm DF
05/02/2020 20:19:14

Yes, it is about 78" at the moment, when I put the wing tips on it will be about 83". Not sure why it is called 78".

Thread: I guess there is no problem
05/02/2020 16:22:55
Posted by Bruce Collinson on 05/02/2020 14:46:20:

Won't 24 hours in a freezer do it?

BTC

PS the parcel, not you.

No, freezing stuff merely stops the biological activity, it does not necessarily kill simple things like bacteria, viruses, stuff is frozen in liquid nitrogen and remains biologically viable when thawed.

What you need is an hour at gas mark 8, now that will kill it.

Thread: New 78" Vulcan for twin 90mm DF
05/02/2020 16:17:39

The first wing has been completed and this followed the photographic instruction sheet and the plans. Sheet the upper surface, add strengthening blocks at some corners, add the elevator and elevon hinge blocks, add the servo rails, sheet the lower surface and cut off the wing, which is shown in the post above. The only area I have deviated is to mount the servos into plastic covers because the plan calls for the servo tops and horns to be exposed. I have 3D printed some servo covers and I have gone back and reworked the rudder servo to match. The second wing is coming along now that the first one is completed.

Wing skeleton being glued into place on the fuselage.dsc08676.jpg

Top surface sheeted.dsc08680.jpg

Servo rails / hatch for the inner elevator.dsc08688.jpg

Servo in 3D printed cover.dsc08693.jpg

Servo for the outer elevon mounted in position before sheeting the lower surface.dsc08696.jpg

Bottom surface sheeted.dsc08698.jpg

Rudder servo reworked so it is not exposed.dsc08691.jpg

05/02/2020 16:00:51

It has been a while since I posted but I have been working away and making good progress.

The topic of this post is how I have designed the wing retention on my model as the plans are silent on this issue. Ideally this should be decided upon before the wings are sheeted, otherwise you will need to cut patches out of the skin.

I have glued ply plates onto the wing tubes either side of the wing joint and reinforced these with triangular stock, all glued on with lashings of epoxy. Threaded inserts had already been glued into the ply plate using before gluing them to the wing tubes. The outside of the inserts is knurled to give a good grip when glued in. Slots are then cut into the root ribs and a short 3mm aluminium bar with holes in the appropriate locations is then screwed to the inserts in the ply plates using cap head screws through small holes in the upper sheeting. By appropriate use of shims, the head of the bolts is relatively flush with the wing surface.

The main aluminium wing tube (the rear one) needs some form of stopper to prevent it migrating in and pressing against the exhaust duct from the fan as this is flexible and will deform allowing the tube to move and the fan performance to be reduced. During the wing attachment, a small piece of sheeting needs removing so you can glue the wing tube to short rib WS1. I took advantage of this and glued 2 sheets of ply between WS1 and the exhaust duct, the first sheet of ply was 2.4mm and had a hole in to match the wing tube so that the wing tube could pass through WS1 by a small amount. The second sheet of ply was solid and this stops the wing tube moving inwards towards the exhaust duct.

Pictures may explain things better.

Ply plates glued to the wing tube shown from above before sheetingdsc08717.jpg

Ply plates shown from below with triangular reinforcement from below after sheeting the top surfacedsc08689.jpg

Wing section removed showing aluminium tubes and aluminium strip to lock the wing in placedsc08706.jpg

Upper sheeting showing the two cap head machine screwsdsc08702.jpg

Two layers of ply between short rib WS1 and the exhaust duct with a hole in the first additional ply layerdsc08710.jpg

12/01/2020 19:15:50

Second wing skeleton completed and test fit. This is getting quite large now and will be too long to fit when the nose and tail cones are on. I need a considerably bigger workshop or I might have to take the doors of the wall cupboard.

dsc08631.jpg

Thread: Power Safe for any receiver
10/01/2020 23:16:22

Looks good. I have been making my own back up power system with Schottky diodes, nowhere near as nicely turned out as this, kudos to you. I use 40Amp rated diodes on each supply to give some overhead, reduces the voltage drop somewhat and provides a bigger package for heat dissipation.

Thread: New 78" Vulcan for twin 90mm DF
05/01/2020 17:48:06

I have completed the skeleton of the right hand wing, spars, ribs, leading edges, trailing edges, shear webs and wing tubes and this fits well with the fuselage. I mainly followed the photo pack. One thing is the photo pack does not exactly stipulate how to set the ribs up and I could not find a note on the plan either. One photo shows the trailing edges all set on the building board, so this is what I have done. I also put the front spar in place as a positioning device whist the ribs were fitted, then lifted it up and glued it in place later in the build. I also added the shear webs before lifting from the board in an attempt to keep everything more rigid once lifted from the board.

Ribs glued in place with the spars.dsc08610.jpg

Rear of the ribs level on the board.dsc08611.jpg

Front spar only used for location at this stage.dsc08612.jpg

Front spar lifted up once top spars, LEs and TEs have been glued in placedsc08620.jpg

Shear webs addeddsc08623.jpg

Wing removed from building board and trial fitted.dsc08628.jpg

Thread: TN Concorde
01/01/2020 18:54:19

Excellent, look forward to hearing how it flies. A chap has one at our club under build. I had a 4 fan plane at one time, the fans all started up at different throttle settings if I opened the throttle very slowly, but once running they all seemed to be in sync.

Thread: New 78" Vulcan for twin 90mm DF
23/12/2019 11:22:10

The exhaust nozzles on the plan are just some thin ply wrapped into a short tube. The advantage of these is that they have a minimal impact on the air stream flowing out of the thrust tubes. I have built the 3D model of the rear former and the air stream and original nozzles to show this.

dsc08594-2.jpg

Greg has then gone on to make a 3D printed version of these.

However, I wanted ones with some conical shape on, but the trouble is that these will interfere with the air stream, so I have made the cone quite small and angled the two cones 3 degree inwards to reduce the impact on the air stream in the middle of the thrust tube. This does mean that the gap between the cones is reduced, but needs must. They have also been angled down 3 degree compared to the outlet former. The 3D model shows the limited impact on the air stream.

If anyone wants the file for the conical version pm me with your email address and I'll happily send it to you.

dsc08594-1.jpg

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dsc08594.jpg

Edited By PeterF on 23/12/2019 11:23:24

23/12/2019 11:15:29

Progress has been a bit slow in terms of the amount of wood added to the plane. I have tackled the rudder and done this according to the plans and all has gone well. It is quite large, larger than the wings on some of my models so it has taken a bit of work.

The main reason is I have bought a basic 3D printer, my son has a model making business (not RC - wargame models) and he has a number of 3D printers, but he has been inundated with Christmas orders plus he had a special promotion on a new range of kits so he has not had time. Anyways, I have done a pair of pilots, taking the cue from Craig's build photos, pilots were 1/12th scale of Thingiverse and I believe the TN model is about 1/16th scale so printed them at 75%. These are the pilots with visors raised, hopefully more detail will show of their faces when painted. I have used the nose cone and tail cone supplied by Greg, spot on, thanks. I have not sanded the nose or tail cones until I got these. I have designed by own exhaust nozzles, I will post a little bit about these later.

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dsc08588.jpg

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Thread: The Gov't, CAA, BMFA & UAV legislation thread
21/12/2019 09:16:43

Yes because the questions also cover issues such as safe operation of model aircraft which you still need to demonstrate and are nothing to do with flying legislation.

Thread: Scammer/Trojan
17/12/2019 18:59:23

I have sent you a message, you are publicly listed in a very obvious place.

Thread: First full size electric aircraft flies.
12/12/2019 09:01:35
Posted by Andy Ellis 1 on 11/12/2019 20:58:35:

Fantastic achievement, but.. does it really reduce carbon emissions overall? I'd like to know how we produce enough electricity for widespread use of electric vehicles without producing carbon.

I can not comment on the carbon footprint of making an IC engine and refining the fuel Vs making an electric motor and batteries. But what I do know having spent a lot of time working with industry in Vancouver and British Columbia is that with hydro, a lot of their electricity is low carbon, so in this case, yes it does work.

It is certainly not the first full scale electric aeroplane, the link states it is the first commercial one.

Regarding views held about generation of electricity, I believe that most people do not appreciate how much the balance has swung in the UK, there is now very little coal firing, some large stations have converted to biomass etc. See electric generation split at Ofgem generation data. This shows that the nuclear plus renewables is approximately 50% of the total UK generation now. What is also noticable on this is the reduction in electricity demand over the years, increases in efficiency and reductions in heavy industry.

Since 2018 the UK has been running for short periods of time without any coal firing, with runs of several weeks at a time being achieved, with the only use probably being peak winter demand. See UK no coal days.

Edited By PeterF on 12/12/2019 09:19:41

Thread: New 78" Vulcan for twin 90mm DF
07/12/2019 13:35:34

Now the fuselage is straight I have continued with the build per the instructions. The tail cone has been planked and the turtle deck sheeting added. The templates for the turtle deck sheeting were very good, they were a little oversize so could be neatly trimmed down to fit. Before I added the turtle deck sheeting I put some extra formers in place for where the battery hatch is going to be cut, putting in a top hatch because I am not keen on the idea of taking them in and out in the underside. Thanks for the idea Greg.

Tail cone plankeddsc08536.jpg

Extra formers for turtle deck at battery hatchdsc08537.jpg

Extra formers for turtle deck at battery hatch, ink markings ran when I wetted the sheetingdsc08538.jpg

Turtle deck sheeteddsc08542.jpg

Edited By PeterF on 07/12/2019 13:35:50

Thread: Use of servo ravel limit to reduce noise
03/12/2019 20:03:31

There was a discussion at the field as we have recently introduced a noise limit at our club. Someone asked if their model was overpowered and over the noise limit, would it be permissible to use the servo travel limit (or end point adjustment depending on transmitter terminology) to limit the rpm to an acceptable figure that gave a pass on the noise meter. You could equally do this mechanically with the servo arm control linkage, but the travel limit on the Tx would be simpler, require less trial and error tweaks and be more precise.

I was sure that I had read somewhere that this was not supported as a noise reduction technique but on searching I can not find anything that states it should not be used. Some people may think that it is easily abused, but if someone wants to flout this then they can easily turn up for their noise test with a large prop on and then change it some other time.

Any thoughts on this, or if anyone knows of any guidance on using throttle travel to limit noise then I would welcome it.

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