The Bergen Intrepid Gasser EB is the newest heli in the fleet. I have provided some specifications and photo's of this helicopter below.
Model Bergen Intrepid Gasser EB
Engine Zenoah(Komatsu) PUH260 Unmodified 2-cycle Gasoline Engine w/Century Torpedo Muffler
Main Rotor NHP Carbon Fiber, 1750mm Diameter
Tail Rotor V-Blade Carbon Fiber, 280mm Diameter
Airframe Dimensions 1475mm long x 460mm Tall
Radio Equipment Duralite 4000mAh Lithium Ion, Futaba 149DP Reciever, GY401 Gyro/9254 Digital Tail Servo, 9252 Digital Servos
I bought this helicopter as part of a business project I am working on with a fellow R/C heli flier and friend. This is a pretty large helicopter and unlike my other helicopters runs on gasoline so as far as fuel is concerned it's extremely economical to run. This helicopter is pretty big and heavy. It weighs in at about 15 pounds, but fortunately the large 800mm rotor blades and PUH260 Gasoline engine provide plenty of lift to move this helicopter around.

The picture below is of Mike's bergen, we did the same color scheme and everything so it pretty much looks like my helicopter. At some point I will get a flight photo of my Bergen but the opportunity has not provided itself thus far.

This big helicopter flies like a yacht in the sky. With it's long tail boom and it's weight of 15 pounds it's not a great performer for agressive 3D however it is capable of basic aerobatics. This helicopter is considered to be more of an Industrial Helicopter for lifting aerial experiments, cameras and other such things. This heli can lift up to 15 pounds into the sky, although that is edging on overloading the entire system. 10 pounds is a bit more realistic for a common load, although mine will rarely see more than 5 pounds of weight.

I originally flew this helicopter with the stock cheap can, like the one in the above picture, that they call a muffler. It may be quiter than running and open exhaust, but I can't imagine that it's by much. My ears were rattling after flying this thing with the stock can. I purchased a Century Helicopter Products chrome Torpedo Muffler and it quited the beast down an incredible amount. I would say it now sounds about like a .50 size nitro heli. This muffler is pictured below.

This model will fly between 20-30 minutes on a tank of fuel depending on the flying style and load you are trying to move with it. It is an awesome sound when you punch out into a high power climb and the engine takes the load it just sounds like power and the Bergen skyrockets into the atmosphere. I don't even have a gallon through this heli yet so I am still breaking the engine in and making sure all the parts stay attached. The gasoline engine produces quite a bit more vibrations than a nitro engine but the sturdy airframe seems to handle it alright. The engine is pictured below, it's about the size of a weedeater engine.
The Bergen was a fun model to build but a bit complex. Having helped a friend build a Miniature Aircraft Fury Tempest, I wasn't too shocked or afraid of the kit. Most of the parts were of high quality and good fit. As with any kit there were a couple of kinks in the construction I found that some of the machined control arms were not as high of tolerance as I expected. I worked around this by using a loctite compound for loose fitting components to hold the bearings firm in these arms. I would hope and expect that problems like this are resolved in future kits. Aside from that one problem I have been very happy with the assembly end of things.

I've had a couple of issues with the tail. Due to it's weight and length it puts a lot of stress on the drive components, mostly the torque tube fittings. With a little forethought and afterthough and some great suggestions by Bergen I have made a couple of changes which have cleared up the problems for now.

With the Industrial Twin tailbox on there you need to add some weight to the front of the heli if you want to be balanced out. Although you could trim this out with the radio, I prefer it to be physically ballasted. Adding a camera mount will probably reduce the amount of weight needed in the nose.

Anyways for your viewing pleasure here are some photo's of the build in progress on the completed pair of helicopters.

Photo's are intellectual property of Jon Caywood and occasionally other sources used with their permission. If you would like to duplicate these photo's or dicuss this website, please contact me at [email protected]