Techniques > Misc
Where to buy Balsa, spruce, ply etc.
Peter:
Scamper,
Very interested to hear you are a bit further down the line on the same B4 project. Inwoods were OK in terms of wood quality, but they could not supply the spruce spars which surprised me. The postage from the UK is VERY expensive and has put me off going this route in future. On an order of £71.54, the delivery was £37.75 ..ouch! Hence my recommendation to try Island Models who I think import from the continent and are based here so it should work out cheaper.
Like you, I was going to go for a piano wire and brass tube joiner system on the B4. Unfortunately large diameter piano wire is hard to get here - I scoured Dublin before for a joiner for a Sagitta glider I built recently without success. In the end I managed to get some from SMC in Brighton, UK. Let me know how you get on with this. I am also going to go for a different airfoil to that shown on the plan. I was talking to a chap who built this version of the B4 and he thought that the scale section shown on the plan was not the most efficient in lighter airs so I am going with a thinner Quabeck section. I guess we can compare performances (eventually!).
Last question - did you build the fuselage in two halves and then join, or did you build one half and then build on the remaining structure? I was hoping to do the latter.
Peter
scamper:
That is a bit much for the postage. :shock: The saving would be cancelled out by the postage.
Not sure what to do with the airfoil. I cant imagine the one on the plan being very accurate on the outer wing panel when the sandwich method is used. Which Quabeck airfoil are you using?
Was looking at the rosenthal site. They use HQ2,5.
www.rosenthal-flugmodelle.com/fuselages.html
This other one uses HQ2 www.icare-rc.com/pilatus_b4_300.htm
It must be about 3 or 4 years since I built the fuselage but I'm pretty sure I did as you said and built one side and then glued the formers to it one at a time. I also used small pieces of ply across the former joins.
Fred:
Hi Guys (Scamper, welcome to the forum ! :D )
About the wing joiner, why not using FiberGlass / Carbon rods instead of piano wire ? :?:
Much easier to find than large size piano wire, lighter... That's what I use on all my gliders. And at 1/5 scale, a 8/10mm rod will be more than enough.
For the wing profile, well, the HQ2.5 will do it, but with built up wings, the accuracy of the profile is only theory... :!:
Depending of the type of flying you want to do the most, you can go for more modern profiles like the SB series (my favourite :D ) or why not, the good old Eppler evolution or Ritz profiles.
Peter:
I am going to use a HQ2.5/12 section so lets see how that works! I've modified formers 7 and 8 so as to achieve the right root section on the fuselage. I guess this will be hard to modify if you have already built the fuselage. I would'nt worry too much as the model with the original section apparently flew fine and only sufferred in marginal lift conditions. Fred - good idea about a carbon rod. Are Island Models going to stock brass tube/carbon rods or do you have a preferred supplier?
scamper:
Hi Fred
Never used carbon joiner before. Will look into that.
I never thought about having to modify the formers :oops: I'll have to get the fuselage out and see if it is possible.
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