Tim Mackey Posted May 8, 2009 Share Posted May 8, 2009 Another vote for the Wemotec fans here....very efficient and very often on less current than some of the really cheap ones. Having said that, I can remember when fan units for IC models would set you back a weeks wages - and thats without an engine.Edited By Timbo - Moderator on 08/05/2009 22:03:49 Quote Link to comment Share on other sites More sharing options...
Foamie Dave Posted May 8, 2009 Share Posted May 8, 2009 Chris, Let me know how the servos come out, always intersteing to get to grips with a few alternatives (especially at that price) Hi Timbo, To be honest I'd never been a fan (soz , no pun intended) of EDFs ...I always thought they sounded awful and seemed vastly underpowered. Then I saw your Sabre last year and said to Alex (Whittaker) that was my fav model of the day. ..If I could have tracked one down I'd have bought one on the spot BTW are you playing out tomorrow at the 3DRC fly -in ?? Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted May 9, 2009 Share Posted May 9, 2009 Hi Dave - was hoping to get along later today, but weather is looking increasingly like the Orme beckons again for some nice strong westerly action - and the wife has me grounded on domestci duties right after this little forum session. If I dont catch you there, then have a good un, and I hope to meet up again with you soon... Cheers buddy - say hi to Alex and the gang for me. Quote Link to comment Share on other sites More sharing options...
Chris Salomon Posted May 10, 2009 Share Posted May 10, 2009 Facing up to my reluctance to build a foamy I wondered what are everybody's views on the use of light glass cloth and something like Poly-C? I know it doesn't really need it and, yes, it will add some weight but, on the other hand, it will make it more durable, more attractive (particularly close up) and more efficient. Alternatively I could build one out of balsa! Quote Link to comment Share on other sites More sharing options...
Ben Mullins Posted May 10, 2009 Share Posted May 10, 2009 RE: BRC Servos, I've got some of these for my E-Pioneer and they seem to be very good, they are deffinatly alot better than cheapy ones from fleabay etc, but i've never used branded servo's so I don't know how they match up. BTW, I think the Beretta is very nice :D Quote Link to comment Share on other sites More sharing options...
Foamie Dave Posted May 11, 2009 Share Posted May 11, 2009 Very windy on Saturday Timbo, only a few of the big guns (and the very brave) went up but still a great atmosphere neverthelessroll on Weston Park !! Chris, youve hit the nail on the head with glassing. More weight means itll potentially need more power (ie heavier 4 cell pack ) so thats another weight gain. The Beretta flys nicely because of its low wing loading (its only about 1.3kg with batteries) so getting it overweight might make it a bit of a bloater. Id just be weary about adding a few extra pounds. Reckon if you could keep the weight gain to an absolute minimum it could be worth a shot though. Hi Ben , thanks for the compliments . Ive bought some absoloute dog servos from ebay, then again Ive had some crackers. IMHO by the time youve experimented its probably cheaper to buy branded ones in the first place ( unless someone does all the experimenting for you ) Edited By Foamie Dave on 11/05/2009 08:07:31 Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted May 11, 2009 Share Posted May 11, 2009 Hi Dave - yes, my spies told me you made an appearance, but that Lyndsay chickened out Got detained on domestci duties in the morning, and weather turned pants after lunch, so stayed home and did some more on the hawk - which I hope to maidedn this week Quote Link to comment Share on other sites More sharing options...
Erfolg Posted May 11, 2009 Share Posted May 11, 2009 I have now had the chance to look at the plan, I am not quite sure at what I am actually lookin at, as yet. It does seem that a lot of Depron is required at varing thicknesses, I to have been considering, where and how balsa could be substituted for Depron. I have so far come to conclusion that it would not be easy, if weight is to be minimised. and adequate strength retained There does seem some potential for a balsa wing (built up similar to the plan, out of 1/`16"). Which then started me to think where the sheet (Depron)could be obtained at sensible cost. It strikes me that it must be available in quantity and low cost, as it appears to be used in the food industry as packaging. Some one has mentioned pizza bases in this context. There must be members of the furum in the food industry who can cast some light as to where and whom are the wholesale suppliers to industry? On reflection there does not appear to be many material options, other than Depron. Is it only known as Depron or are there other trade names for the stuff. What actually is it, Erfolg Quote Link to comment Share on other sites More sharing options...
Foamie Dave Posted May 11, 2009 Share Posted May 11, 2009 I used EPP for mine (totally different to depron) Depron is used for underlay on laminate flooring and for underfloor heating installations. Pretty cheap if you shop around or do a quick google. Depron wont bend like EPP and unfortunately breaks very easily Im afraid. If you hit the deck at anything above 10mph chances are it'll be going home in a bin bag. ..thats why I stick to EPP To give you an idea how it goes together have a look at the gallery pics here Quote Link to comment Share on other sites More sharing options...
Phil Winks Posted May 11, 2009 Author Share Posted May 11, 2009 Erfolg the depron sheets that we use in the hobby are originally insulation panels designed to be used under floors and many wholesalers exist and are easily tracked down by googleing Depron however Epp is the prefered medium for this model I believe and if you contact Flying wings you should find them helpfull with supplies of this. Edited By Phil Winks on 11/05/2009 16:49:14 Quote Link to comment Share on other sites More sharing options...
Erfolg Posted May 11, 2009 Share Posted May 11, 2009 If I understood the drawing! Learnt to read the thread! I would have seen that the material is EPP. So what is Epp, how is it used commercially, and wher will I find it without going to a specialist model shop? Erfolg Quote Link to comment Share on other sites More sharing options...
Erfolg Posted May 11, 2009 Share Posted May 11, 2009 I have just found out it is Expanded Polyproprlyene a major supplier appears to JSP. ,so they claim. It also says it is used primarily in the car manufacturing trade. Does that suggestit may be used in sheet form for door trims. If so Mersey and tTne side are probably potential retail sites. Although you guys will probably know better? Erfolg Quote Link to comment Share on other sites More sharing options...
Foamie Dave Posted May 11, 2009 Share Posted May 11, 2009 JSP is actually the main manufacturer of EPP and supplies worldwide. Its main use is in packaging and the automotive industry (amongst other things it is used as base material behind plastic bumpers to absorb the impact..therefore suits my flying to a T ) As for suppliers I think most of the main outlets have been covered a few posts up, ie Flying Wings, RCFoam, Robotbirds, epp-versand etc etc. If you want to get it direct from the manufacturers the cost of shiping and customs duty will far exceed the price of the foam...ask me how I know Hope this helps clarify things a little Quote Link to comment Share on other sites More sharing options...
Erfolg Posted May 11, 2009 Share Posted May 11, 2009 Hear what you say. Although it does gripe with me that the cost of posatge is often higher than the value of the material. Is there any other material that can be substituted for EPP, which can be obtained in the larger cities (other than London), from general trade suppliers? I guess ther is not, or ypu would have probably mentioned it, but the question is worth asking. Erfolg PS being polyprop, I can see why it is so tough, yet is generally cheap as a base material, from LDPP to HDPP Quote Link to comment Share on other sites More sharing options...
Foamie Dave Posted May 13, 2009 Share Posted May 13, 2009 Unfortunately postage costs are always going to be a problem with large objects, if it takes up room in posties van your going to have to pay for it Im afraid. Id stick to EPP (unless you're a dab hand at creating compound curves with depron or balsa) . It only cost a couple of quid a sheet so you'll be hard pressed to find anything cheaper with similar properties Quote Link to comment Share on other sites More sharing options...
Erfolg Posted May 13, 2009 Share Posted May 13, 2009 I do not think it is all about cost. It is not quite, all about the postal service. Although I am one of those wingers who have had a parcel sent to Belfast, destroyed, no compensation, all because i was on holiday. Or even when I was sent a present by daughter (from Aberdeen, whilst I was in Manchester) which never arrived. Another was sent. Only to receive a letter from the post office demanding information, as if I had carried out a criminal act. The quicker the PO is totally reformed the better in my opinion. No, it is about convienantly getting hold of building materials, in this post model shop era. In a time frame that is convienant or buying such bulk, that I am always in stock, at realistic cost. What is worst, is that I can often buy modelling materials from a virtual shop from the other side of the planet cheaper than a UK virtual shop. Excluding GC and BRC from these comments, UK, virtual shops as hey can be. Even when an incompetant goverment devalues the pound, as if there is no tomorrow (they will never see my vot again, I was totally fooled). A moaning beligerant Erfolg Quote Link to comment Share on other sites More sharing options...
ajreynolds Posted July 27, 2009 Share Posted July 27, 2009 Greetings all, I've been looking over the Beretta as a possible build and had a question. From what I can see, there doesn't appear to be any provision for cooling of the battery and ESC. These can heat up quite a bit with the current draw of an EDF, especially on a hot day. Has anyone dealt with this issue? Thanks, Andy Quote Link to comment Share on other sites More sharing options...
Foamie Dave Posted July 27, 2009 Share Posted July 27, 2009 Hi Andy, We dont have hot days in Manchester so its never been a problem . On a serious note, I used a 60 amp esc (80 a peak) esc and good quality 25-30c lipos and both felt warm to the touch after a flight but never hot. I did cut a small vent in the prototype at one point but the effect on cooling was neglible. I used a wattmeter to ensure all the parts in the powertrain were well within spec and as the motor unloads quite a bit when its airborne , the static thrust measurements always show the worst case as the motor is under full load. If you plan on using a smaller esc or runing lipos at their limit theres no harm in putting a cooling duct in there just in case if you want Happy Building Dave Edited By Foamie Dave on 27/07/2009 20:47:20Edited By Foamie Dave on 27/07/2009 20:49:04 Quote Link to comment Share on other sites More sharing options...
ajreynolds Posted July 27, 2009 Share Posted July 27, 2009 Thanks Dave, I'll have to consider a duct of some sort I think. At our field here in San Diego, we can hit the 90's and above on a hot mid summer day. Andy Quote Link to comment Share on other sites More sharing options...
Foamie Dave Posted July 27, 2009 Share Posted July 27, 2009 SD ...definately a bit warmer than ole blightly from what I can remember. Dont think it dropped below 100 when I last paid a visit. In that case I think an odd duct or two would do the trick. Maybe adding a NACA style cutout to the in the side of the fus might look the part and wouldnt add much drag Quote Link to comment Share on other sites More sharing options...
Adrian Norris 1 Posted August 12, 2017 Share Posted August 12, 2017 Where can I get the plans for the Beretta? Thanks Edited By Pete B - Moderator on 13/08/2017 16:00:28 Quote Link to comment Share on other sites More sharing options...
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