Posts

Showing posts from July, 2014

New Pike Precision Slim fuselage

Image
Samba Model is releasing a new slim fuselage for the Pike Precision. Philip Kolb, one of the designer says about this new fuselage:

"As we are always interested in areas of improvement on our planes we are especially intriegued to save drag - especially on fast flying aircraft like the Pike Precision.
Honestly it is very difficult to reduce drag on the wings' sections as the wing needs to operate within a wide variety of lift coefficients. Reducing airfoildrag at low lift coefficients and high Reynolds numbers - so to say at high speed - will almost certainly result in worse performance in other flight phases than speed.
One easy area of improvement though is to reduce the surface of the fuselage. The latest state of the art equipment (batteries, recievers and servos even became smaller than before and thereby allow to reduce the length and diameter of the fuselage nose. This reduction will mainly result in a reduction of inertia, as the nose can be shortened to some extend.
High…

Vagabond assembly

The Vagabond is ready ! It weights 620g. Overall, the assembly went well, the design for an EPP glider is pretty good. I started by the fuselage and carbon rods to stiffen the boom. Then I also installed the elevator and rudder control rod sleeves. Be careful to not bend them while installing them into the foam because when bent they can make the mouvement of the rod less smooth and bad neutral position return. The servo tray is glued on the EPP using fluid cyano. Once done, I focused of the tailplane, that I wanted absolutely to make removable. My first idea, what to modify the joiner extremity (4mm carbon rod) to lock it in rotation with a corresponding print. Problem was that I still could twist the tail because of the rod torsion. My clubmate Joel Marin, who build a Vagabond too, found a clever and simple solution for the tail: use a small aluminium tube at the root, and drill a small hole in the tube and the carbon rod to install a stop pin. The pin have a L shape to secure it w…

Nice video using a Drone

A superb video from Thibaud, using his TBS Discovery Pro.


How to make very inexpensive 2.4 ghz antenna sleeves

I use a cotton bud (Q-tip) that I cut to keep the center part. Diameter is perfect for 2.4 Ghz antenna, even with shrink tube around. Then I put some hot glue on one side to block the antenna. In the fuselage I glue one guide with cyano. For the second antenna, I let it free but use a piece of coroplast to position it correctly (vetically), along the receiver. The cost ? 500 cotton bud cost 30 cents so cost is 0.12 cents for 2  !!!!

PS: of course, you can use the cotton bud in your ear before to cut it, so it is even cheaper !!!!!


Fully moulded, 3.5m, Fox

On sunday, I went to the col des Faisses, near corps. I met there Pierre Emery with his very nice Fox, 3.5m wingspan, fully moulded, originaly sold by Graupner, but in fact made in china by Launch Model (ex zoom model). The plane is beautiful and flies very well in addition to be georgous in the air. Hereafter are some picture I did.



Shinto maiden flight

Maiden flight of my Shinto went very very smoothly. I went to the col du glandon again because the weather forecast was indicating no wind or 5km/h maximum from west, south west. I was however expecting some thermal breeze created by the valley. when I arrived, the wind was coming from the north east valley. The time to walk to the slope, the wind stopped and switched to south valley. So, I drove 1 km, climb to the slope. The gentle breeze was about 4 to 5 m/s, not more. So I launched the Shinto unballasted and everything was perfect from the beginning: no trimming needed, CG fine, settings fine with the right amount of snapflaps, differential OK. Empty weight is 2103gr and CG is set to 86-87mm. The Shinto is very easy to fly, very precise, and manoeuverable on the ailerons. I found the flaps to work very well in thermal position and efficient in butterfly mode to slow down the plane (empty, that's right). The Shinto, as soon as it takes its speed is impressive and easy in turn, w…

Graupner V-Venture review in Modèle Magazine

Image
My 4 pages review of the V-Venture has been published in the July issue of Modèle Magazine.



Shinto assembly

Below are some pictures of the assembly of the Shinto. the LDS installation requires some attention as everytinh is very tight. The result is perfect, with no slop at all, removable servos despite they are bigger than recommended. In the fuselage I used the new HV 6125e from MKS, so the plane doesn't need any S-BEC, as I 'm powering it with a Li Ion 2S 2.9A battery. Empty flying weight is 2100gr. I didn't need any lead except the one moulded and provided by Vladimir. I also produced a spreadsheet for the ballast. I found that above 1.7kg of ballast you need to put some balance lead in the nose as the CoG is moving backward of 3mm.