Phil 9
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Posts posted by Phil 9
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Posted by Dickw on 24/02/2019 10:30:24:
I have tried many Leisure batteries over the years and don’t think they are suitable for our application – none that I bought delivered on capacity or lasted more than 2 years at best. The car batteries I tried actually worked better.
About 6 years ago I invested in a 12v pack made up of 8 x 15Ah Life cells (marketed for electric bikes) in a 4s2p configuration. Although only a nominal 30Ah, the Life cells have a flatter voltage curve under load and handle deeper discharge better so it gives me far more charges than any 75Ah Leisure battery ever did. Also it weighs a lot less, and is still going strong after 6 years.
Why do I field charge?
Yesterday I had 8 flights, and the batteries I use cost more than £50 each. I took 4 charged batteries with me and recharged each on site. To have eight batteries would mean spending another £200 just for one type of aircraft.
Because of weight and space considerations I use a small 2s 300mAh Rx battery – I also recharge those between flights just to be on the safe side.
Dick
I built my own 12v pack from 18650 cells I bought used from ebay that I use for camping. As they were used they did not have full capacity but I discarded any with less than 1Ah capacity mine has 48 cells arranged as 3s so has a 16Ah capacity. Lot of youtube videos showing people build larger packs to power cars or even homes link . it was more of a fun project as it can be time consuming to test the cells and assemble but if you have the patents it may provide an alternative route
Edited By Phil 9 on 24/02/2019 13:38:23
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well there is no one size fits all solution as peters example demonstrates
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one idea I had but never implemented was to wire a leisure battery into the car with a split charger
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My personal preference was just to buy some extra lipo batteries for the model and charge one or two from my car battery at the field if I really needed too but a 6s 5000mah battery does take a good while to charge at the field.
One club I attended built a bank of leisure batteries into the club shed that were charged by a solar panel on the roof. it worked very well
a generator seems pintless to me as it generates noise and you still need to carry fuel with you. It would be simpler to use an IC model as you just wiped out any advantages of electric power.
Edited By Phil 9 on 24/02/2019 08:49:53
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I may have this wrong but I was told you should only use about 50% of the leisure battery's capacity because if it discharges below that level it can be damaged
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I have ordered some EVA foam floor tiles as an experiment. I think they should do the job and at less than £4 for 4 large tiles it is significantly cheaper that anything else I have seen
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Well a bag of rohacell off cuts cost ?30. I don't know how much material you get for that or if it is worth the gamble
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I am looking for some foam to make some tool holders in a tool box. There is plenty high density closed cell foam available but it seem to be expensive for what it is
here is an example f:0">http://www.ebay.co.uk/itm/Shadow-Foam-Sheet-Britool-Draper-Blue-Tool-Box-Organisation-Motor-Racing/222907830005?hash=item33e6578ef5:m:m4hvRYgWPnertqF6LWl9j6g:rk:1
f:0can anyone suggest a cheaper alternative or maybe I can order the same material under a different name?
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Posted by cymaz on 23/12/2018 13:51:29:
Couple of things on this..
- Anybody watched the Navy series about HMS DUNCAN on Channel 5? Apparently this ship can track a tennis ball sized object at great speed from 5 miles or so........so why didn’t the military track this object and follow it to home ?
ship radar is designed for a very specific use. ie it tracks inbound threats and the information is passed to a gun that destroys the object. it has been used to protect land sites but I doubt it is a suitable system for a civilian airport in a highly populated area.
Edited By Phil 9 on 23/12/2018 15:27:21
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I am not condoning the actions of the press here but highlighting a point that could affect many. Most of the information about the couple released by the press came from the couples own facebook page. This is already in the public domain and can be used and shared by anyone at anytime and for any purpose. Be wary of what you put in social media as you can not control it use.
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Posted by Peter Christy on 20/12/2018 09:33:09:
Looking at the issue in a slightly wider context, this clearly illustrates a fundamental problem with the coming drone legislation: It isn't worth diddly squat unless it can be enforced!
Enforcement means boots on the ground, and that in turn costs money.
Until now, we've heard a lot about the law, but very little about enforcement. Will incidents like this change things?
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Pete
flying over an airport without clearance is already illegal. the problem is laws only affect the law abiding
Edited By Phil 9 on 20/12/2018 13:12:32
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I went through this with my son. RC cars can be tricky they seem to come in only two forms. cheap toy or expensive (and complicated) hobby cars with not much in-between . the proportional car controllers will be a little big for a six year olds hands
**LINK** not proportional but a fun starter suitable for a six year old
after that you are into hobby cars **LINK**
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Posted by supertigrefan on 10/12/2018 19:39:02:
A blatant breach of the trades description act for (mis)using the adjective "Sexy" in it's description surely?
I wish I could un-see this
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Gliders also have a good online presence and online shop
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I decided to build my own workbench and it turned out to be a fun little project. I used 5 2x4 lengths of wood and one 18mm thick sheet of MDF at 4ft x 2ft.. Although I was surprised by how much I spent on screws.
I built it quite tall at 42 inches high as I thought this would suit me for working standing, I can also cut the legs if this turned out to be too tall but I am happy with the height.
One thing I did not think about properly until after the build was making the top perfectly flat. any twist or high spot in the frame can be transferred to the top surface even when using a relatively thick top as I did. Checking mine after I found it is not perfect however I think it is close enough that I will be able to rectify it by removing the top and sanding the frame to reduce a slight high spot in one corner.
My bench is very simple but I think will be sufficient for me as I am not a prolific builder but I did learn a few ideas that maybe useful to others. I spotted on the airfield models website he used a thick sheet of hardened glass as the top surface to produce a perfectly flat building surface. furniture makers us a torsion box design to produce a perfectly flat work surface. I believe this would be a great option for a model building workbench and if I ever need anything better this would be the way to go for me
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small used glow engines sell for reasonable low prices. I use both but have noted that buying used glow can be the frugal option. Also when you done with it you can sell it for about the same price you bought it for. selling used electric motors and batteries is more difficult
f:0">http://www.ebay.co.uk/itm/Os-Max-La-40-Model-Aircraft-Engine/283285420901?hash=item41f5207b65:g:aKUAAOSwrZBcApn4:rk:1
f:0£25 delivered for an OS 40?
Edited By Phil 9 on 04/12/2018 19:25:32
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I think spare parts are available and there are tutorials on youtube on how to replace them. it is worth doing a search to find your exact model. that's is probably you best starting point
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maybe some kind of extractor would be a good idea also
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I had a similar experience with a BMFA classified sale. I was staring to get complicated and I had my suspicions something was not right and I cancelled the sale. I sold the item to someone else with a paypal payment and no problems.99.9% of the time it is a great way to buy and sell modelling items but you still need to be careful.
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IC or electric? well I do know smaller models tend to cost less than big ones if budget is you main concern
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Posted by Cuban8 on 27/11/2018 12:33:58:
I can recommend these f:0
Very sturdy and the drawer is large and of a useful size for odds and ends.. I just added some extra cross brace support under the work surfaces to keep them dead flat. A light could easily be fixed under the top shelf. My building board and jig fit nicely. Had it over a year now - no probs.
I had spotted those but I wonder about the quality. Could you please tell me the height of the work surface from the floor
ARTF out of stock
in Sport, Aerobatic and 3D kits
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Im looking for a new 60 to 120 sport model artf. but anything I have found that I like seems to be Out of stock.
have I missed something?