RE: My first 2X2 pattern plane construction
Thanks for your compliments about this construction.
Posted on: 10/1/2009 12:36 PM by Author "geoffroyBelgium" in the forum "Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=9138711

RE: My first 2X2 pattern plane construction
The plane is almost finish. I have just to mold the bottom part of the fuse. [image]http://www.lumay.be/imagesForums/multi2X2/GravitonAlmostFinish.jpg[/image] The master core is made with extruded polystyrene foam. The foam can be shaped with a hot wire, a knife or with sandpaper. To obtain a strong surface, the master is covered with a 80g glass fabric and Epoxy. The master is finished with a two components polyester painting. The master is positioned on a support to make the first half of the mold: [image]http://www.lumay.be/imagesForums/multi2X2/moulage0000.jpg[/image] The master is covered with 3 layers of polished wax and finally one layer of PVA. After that, a special gelcoat for mold is applied generously with a brush. [image]http://www.lumay.be/imagesForums/multi2X2/moulage0002.jpg[/image] 1 layer of mat 225g with polyester: [image]http://www.lumay.be/imagesForums/multi2X2/moulage0003.jpg[/image] After 3 layers of mat 300g, the first half is ready. Now the second half: [image]http://www.lumay.be/imagesForums/multi2X2/moulage0004.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/moulage0005.jpg[/image] The mold is finished. [image]http://www.lumay.be/imagesForums/multi2X2/moulage0006.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/moulage0007.jpg[/image] On each half, a layer of gelcoat is applied with a brush. A spray gun will give a better results... 2 layer of 80g glass fabric are applied on each part of the mould with Epoxy. When the Epoxy is a little bit cured, I cut the surplus of fabric along the junction. After that, the two parts of the mold are fixed together and a last layer of 80g fabric is applied. [image]http://www.lumay.be/imagesForums/multi2X2/moulage0008.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/moulage0009.jpg[/image] [link=http://www.lumay.be]www.lumay.be[/link]
Posted on: 9/29/2009 4:12 PM by Author "geoffroyBelgium" in the forum "Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=9132968

RE: My first 2X2 pattern plane construction
Some pictures of the rest of the construction: [image]http://www.lumay.be/imagesForums/multi2X2/capot1.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/capot2.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/capot3.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/fusoAvEntoilage.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/gravitonPresqueTerm1.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/gravitonPresqueTerm2.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/gravitonPresqueTerm3.jpg[/image]
Posted on: 8/31/2009 10:31 AM by Author "geoffroyBelgium" in the forum "Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=9058581

RE: My first 2X2 pattern plane construction
Thanks. For the next plane, I will search a store with 1st choice balsa sheet. [b]The construction of the fuse:[/b] You will see one more time that I like the technique with Depron rib. When the rib have to be stronger, a plywood sheeting is used. All the glueing Depron/Balsa and Depron/plywood are made with PU glue. This glue is very interesting because it fill the holes and the slits. For the construction of the fuse, I'm using a construction inspired by the insight from http://www.insightrc.com/. However, the shape of the fuse has been rounded. [image]http://www.lumay.be/imagesForums/multi2X2/fuso.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/redim0024.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/avionAr.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/avionAv.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/graviton280509_1.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/graviton280509_3.jpg[/image]
Posted on: 8/26/2009 11:16 AM by Author "geoffroyBelgium" in the forum "Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=9046472

RE: My first 2X2 pattern plane construction
Yes the servos are the HS5625MG. The torque is too high for this application (9.4 kg.cm). A faster and smaller should be better.
Posted on: 8/26/2009 7:29 AM by Author "geoffroyBelgium" in the forum "Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=9045859

RE: My first 2X2 pattern plane construction
I have weighted some parts of the plane. The weight are for the parts ready to fly. The wings are covered with servo, servo arm,connections,... The stab is also complete. 1/2 wings: 540g and 550g 1/2 stabs: both 102g The weight of the fuse without covering: 900g (more details about the fuse in the next posts) The weight of the wing could be decreased because the servo is heavy and the links between the servo and the aileron are not optimized. I prefer something too strong for my first experience with a 2X2. What do you think about these weight values?
Posted on: 8/25/2009 12:37 PM by Author "geoffroyBelgium" in the forum "Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=9043707

RE: My first 2X2 pattern plane construction
The wing sheeting is made with 2mm balsa and the stab 1.5mm. Unfortunately, I have used balsa from the local store. Then, it's not 1st choice balsa. The weight could be reduced with a better selection of the balsa sheet. Moreover, it seems that the construction is too strong. But for the first construction of this kind of plane, I don't want to take some risk. I think that the total weight of the plane will be slightly inferior to 5kg with an OS160. For an electric motor, the construction should be lighter. I give more details about the weight as soon as possible Construction of the rudder The rudder is a foam core with a 1.5mm balsa covering. [image]http://www.lumay.be/imagesForums/multi2X2/constructDerive.jpg[/image]
Posted on: 8/25/2009 11:42 AM by Author "geoffroyBelgium" in the forum "Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=9043574

RE: Insight build...another wood roach.
In the [link=http://www.rcuniverse.com/forum/m_9040604/anchors_9040604/mpage_1/key_/anchor/tm.htm#9040604]thread[/link] I'm presenting a construction inspired by the insight. Thanks to the developer of the Insight for sharing the pictures of the construction.
Posted on: 8/25/2009 3:17 AM by Author "geoffroyBelgium" in the forum "Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=9042779

RE: My first 2X2 pattern plane construction
Ok if you are interested, I continue. The wings are now complete (covering, servo,...) but I can not give you the weight right now. Probably tomorrow. Some reenforcement for the aileron hinge: [image]http://www.lumay.be/imagesForums/multi2X2/ailerons.jpg[/image] After convering with Oracover: [image]http://www.lumay.be/imagesForums/multi2X2/entoilageAile.jpg[/image] [b]And now the construction of the stab:[/b] Same method than for the construction of the wings. I really like this method. It's also possible to do that with a classical (not a CNC) hot wire. [image]http://www.lumay.be/imagesForums/multi2X2/decoupeStab.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/assemblageStab.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/redim0013.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/redim0015.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/redim0016.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/empenage.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/stabPoids.jpg[/image] I can give many other informations about the construction if people are interested. Do not hesitate to give your point of vue on the technique. It's my first 2X2 pattern plane. Then every opinion, remark could be interesting for me.
Posted on: 8/24/2009 4:33 PM by Author "geoffroyBelgium" in the forum "Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=9041134

My first 2X2 pattern plane construction
I would like to tell you the story of the construction of my 2X2 pattern plane. [b]First, the construction of the wings[/b] The rib are made of 6mm depron. I'm using a method derived from the laser method to cut the rib. A piece of depron are placed to form a comb. Afterward, the rib are cutted with a CNC hot wire. The rib situated at the extremities of the sheath are reenforced with 1.5mm plywood. [image]http://www.lumay.be/imagesForums/multi2X2/redim0017.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/redim0018.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/redim0019.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/redim0020.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/redim0021.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/redim0022.jpg[/image] The rib are covered with 2mm balsa. The classical method. [image]http://www.lumay.be/imagesForums/multi2X2/coffrageAile.jpg[/image] [image]http://www.lumay.be/imagesForums/multi2X2/ailePoids.jpg[/image] If there is some reactions about the construction, I will post some pictures about the rest of the construction. [link=http://www.lumay.be]my personal website[/link]
Posted on: 8/24/2009 1:20 PM by Author "geoffroyBelgium" in the forum "Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=9040604

Voodoo Express
Hello, I'm a beginner in pattern flying. This year, I fly a Galaxy (very old design just before the well-known Curare) in the sportsman category. I don't want to have the same plane that the other guys and the idea is to perform the construction myself. The Voodoo express seems to be a very interesting pattern plane even if it is not really present in the fields. A few "old" threads are dedicated to this plane in this forum. Is it possible to obtain more informations about the plane? I have already the plan of http://www.insightrc.com/ Geoffroy ( www.lumay.be )
Posted on: 7/3/2009 7:43 AM by Author "geoffroyBelgium" in the forum "Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=8903106

MOVED: Voodoo Express
Pattern Flying: http://www.rcuniverse.com/forum/fb.asp?m=8903106
Posted on: 7/3/2009 7:36 AM by Author "geoffroyBelgium" in the forum "Classic Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=8903347