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Hirobo GPH 346

Some excellent sites for Hirobo GPH 346 info are Bill Ludwigs and Scott OíConnellís
Tauseef Tahir also has some interersting info on his CCPM enabled GPH.

I bought my own GPH the summer of 1999. However, Iíve so far only had about 25 liters of flying time with it for various reasons.. (and itís not due to the GPH itself)
I just had a Zimmerman 46 Quiet Pipe fitted to it, and look forward to try it out with this new pipe. It must be a vast improvment over the stock OS muffler.
I am in the process of putting together a FAQ/Tips site for the Hirobo GPH-346. If you have any good tips, be it tuning, flying, modifications etc, donít hesitate to email it to me on

GPH 346 Flying Journal
Itís been over 4 years since I bought this metal horse now, but I havenít had much flying time on it. But Iím now starting to do a bit more flying on a regular basis and maybe note down a word or two on any flying sessions of interest.


First flight with the newly fitted Zimmerman Quiet Pipe. Quite a nice noise level compared to the stock OS muffler. It was quite windy in the open land of southern part of Jśren/Stavanger (west cost of Norway). With the North Sea poking right in at the farm where we usually fly, we get used to high winds and gusts.).


Now flying on Dynaglo 5% Nitro, the OS seems to be a lot better on idle. Iíve always been a fan of 0% nitro and have had no problems with it. But maybe it is about time the engine gets a bit more juice to work on. Anyway, the one tank I flew worked out quite well.
Increased the hovering pitch a bit and the GPH is now quite nice to handle during hovering. It still floats around a but during hover and never seems to be able to find the perfect trim setting.
Next upgrade I will be looking at is getting a new pair of tail blades. One of the things I donít like with the GPH is the tail response, especially during right turns. Turning up the Exp on the radio is a intermediate solution, but I would like to have a bit more pitch to work with.
The canopy needs to be modified a bit to avoid melting from the heat of the pipe...


Iím still flying with the original wooden blades, but it looks like they are getting ready for a change. The plastic covering is starting to fall off on the tip. Time to invest in some proper carbon fiber blades maybe?
Still having trouble with vibrations on the tail. The main body seems fine, and there no buildup of foam in the tank, so I think it might be the wire drive that is slightly off. (It was a heck of a piece to get installed.


Itís been a extremely hot week for Norway. Temperatures has been exceeding 30 degrees centigrade (normal is 15-20), blue sky and the best flying weather for a long time. As the heat was to much to go flying in, this day turned out marvelous. Flew 3 tanks on the local football pitch, and the model is now more stable than before, as I rebalanced the blades. Thereís just a tiny twitch on the tail during high RPM now, which is either due to the flybar paddles, or the shaft drive.
The model certainly needs some replacements tail blades, as the response on the tail is really bad. A complete 360 probably takes about 1,5 sec to the right and 2 sec to the left, and there is nothing left to take out of the tail pitch movement. I think Iíll see if an upgrade can be picked up on my UK holidays in a weeks time.


Quite a few months has passed by without much flying - if any. Iíve just placed an order for NPH main blades, a new set of tail blades, as well as a carbon tail pushrod kit from Quick UK. Hopefully this get rid of the minor vibrations as well as give it a better performance on the tail. Looking forward to some more flying this year. Hopefully the snow and freezing cold wonít be back for a while, which should give me some time to do a couple of flights... Iíd hate to wait till the end of the winter...


The new NPH main blades and a new set of 85 mm tail blades made a big difference. Tracking was spot on at first flight, and tail response improved. It also got rid of the vibrations
Unfortunately a engine cut in about 4 meters height lead to a broken tail pitch slider and two busted tail blades. Luckily QuickUK replaced the tail blades in two days and Iím now waiting for the replacement pitch slider. I also purchased a metal tail pitch lever from Revolution Models Ltd which should last a lifetime.
Iíve also invested in a battery and system check unit called Gem 2000. Once Iíve used it for a while, Iíll put up some more details about it.


Finally got all the parts and the heli is ready for itís next flight. Unfortunately the weather is not up to scratch with rain and high winds. Hopefully the weekend will give the possibility for a couple of flights. Painted the canopy flourencent yellow to get a good visability of the heli. The red light you can see is the the new onboard battery and system check unit. An excellent little device that one cannot miss to see during flight...


My good old Futaba 154 Gyro died on me (not bad milage on it, as I bought it in 1988!), leading to a bent tailboom (and only a bent tailboom). Luckily a soft pine was standing in the way of the ground, leading to the lucky escape. Will be looking at replacing the gyro with the Futaba 401 combo pack... Guess it wonít be till next summer before I fly again... Good time to pick up on the Morley MXA project again...

Last Changed 09.11.2003