Pattern Biplane
#251
Well, you do have a fuselage half........
Last time I was in your plane room I saw a proper pattern plane. A sexy little built up number with a real engine on it and the nicest looking carbon fiber pipe I think I have ever seen. When will that plane fly? (I may be a tad biased about the pipe).
Keep up the good work.
Scott
Last time I was in your plane room I saw a proper pattern plane. A sexy little built up number with a real engine on it and the nicest looking carbon fiber pipe I think I have ever seen. When will that plane fly? (I may be a tad biased about the pipe).
Keep up the good work.
Scott
Ken
#252
Thread Starter
My Feedback: (29)
Ha ha, I have two fuselage halfs done! Right now I am figuring out the internal structure. All the formers, doublers, and gear plate need to be in before I can join them. I'm planning on getting the halves seamed over the coming weekend. Scott, the slimmer is next in line, I promise.
#255
#256
Thread Starter
My Feedback: (29)
Ok you two, enough nonsense! I did cut out a couple formers from the actual material that is being used. It is a laminate of 1/8" Divinicell with 5.7 oz carbon cloth on each side. This is some of what I have been selling to other guys as well as the fiberglass material as well. Over the next few days I will be cutting formers and getting them glued into place.
#257
Ok you two, enough nonsense! I did cut out a couple formers from the actual material that is being used. It is a laminate of 1/8" Divinicell with 5.7 oz carbon cloth on each side. This is some of what I have been selling to other guys as well as the fiberglass material as well. Over the next few days I will be cutting formers and getting them glued into place.
That is some interesting material. Had to look it up. The Smaragd I had used a bunch of the honeycomb stuff for formers and servo mounts and such. It was light enough but I felt was a bit to fragile. This looks better to me. Looking good and nice progress!
Ken
#258
Ok you two, enough nonsense! I did cut out a couple formers from the actual material that is being used. It is a laminate of 1/8" Divinicell with 5.7 oz carbon cloth on each side. This is some of what I have been selling to other guys as well as the fiberglass material as well. Over the next few days I will be cutting formers and getting them glued into place.
Yup, that is the same laminate I use. I need to make some more since Chris lost 2 426 planes at Phoenix last weekend...
Are you going to do the inner laminate and seam in 1 piece or tape the seam later?
Scott
#259
Thread Starter
My Feedback: (29)
Scott, I'm going to go ahead and tape seam but if you notice there is a small twist. I'm sure that you have noticed that there is an edge flange molded onto the fuselage seam. This is only the last layer of 3.1 oz cloth. A thin bead of paste adhesive will be applied to this flange, some straight resin applied to the edge of the fuselage and then the molds will be clamped together. I will then apply a 1" tape across the seam. I will be posting pictures of a fuselage early next week.
#260
My Feedback: (121)
Hi Shawn, Scott,
I was curious about Divinylcell and googled it. Wow, that stuff is lighter than contest balsa. What do you think about using it in all balsa construction? I was thinking of laminating 1/16 balsa to the outside and using it for fuselage sides; I'd reinforce the inside too depending on the location in the fuselage either with open framework or more 1/16 balsa or maybe ply around the firewall/landing gear areas.
Thanks for your thoughts!
-Will
I was curious about Divinylcell and googled it. Wow, that stuff is lighter than contest balsa. What do you think about using it in all balsa construction? I was thinking of laminating 1/16 balsa to the outside and using it for fuselage sides; I'd reinforce the inside too depending on the location in the fuselage either with open framework or more 1/16 balsa or maybe ply around the firewall/landing gear areas.
Thanks for your thoughts!
-Will
#262
Thread Starter
My Feedback: (29)
Yes, I would not put any screws in it. For things like servo mounts I lay up a panel made from 2 sheets of 1/32 ply and 3 sheets of 5.7 oz CF cloth. I also use this for gear plated and firewalls. Ken has seen some of this. The Divinicell material I use anywhere you would use balsa or lite ply. I'm not a big honeycomb fan, it's only real strength is in compression. As far as using a Divinicell laminate for fuselage sides and such, I think it would be better to just stick with balsa, but to be fair I have not experimented with it in this fashion.
#265
I just realized you have some balsa sheet in the mold. Is it being used for extra stiffness? Sound dampening? I guess I assumed the glass alone would be "good enough".
Ken
Ken
#266
Thread Starter
My Feedback: (29)
Ken, a fuselage this large needs a core material to stiffen it up. To do that with just fiberglass would make for a heavy fuselage. I chose 1/32 balsa because of every type of foam that could have been used, balsa in this case gave the best strength to weight ratio. Hopefully tomorrow I will have a final weight on this fuselage. The max I was shooting for is 30 oz.
#267
Makes perfect sense. My Smaragd was Kevlar with a 1/16 layer of white bead foam with 3/4 oz.?? glass cloth over it. It was very fragile. IMO. I think part of that was using Kevlar. While Kevlar is very tough it seems epoxy does not really seem bond to it. The epoxy just seems to encapsulate it.
Thank you for posting your build and putting up with all my questions. I'm learning a lot!!
Ken
Thank you for posting your build and putting up with all my questions. I'm learning a lot!!
Ken
#271
Great job!
Ken
#273
Hi,
Yes at 39oz it is a little on the heavy side.
What weight were the balsa sheets ??
Rohacell 51 is very good in a fuz,, sandwich - a little pricy - but light.
Brian
Yes at 39oz it is a little on the heavy side.
What weight were the balsa sheets ??
Rohacell 51 is very good in a fuz,, sandwich - a little pricy - but light.
Brian
Last edited by serious power; 01-22-2018 at 03:20 PM. Reason: correction