FG20調整的問題在美國rcuniverse也引起長達13頁(到2009/05/04為止)的廣泛討論.由於部份使用者調整不順,有人懷疑PUMP的問題,也有人懷疑是點火系統的問題.最後由美國CDI老廠牌C&H Ignition 的人
在測試後的發表如下:
Well CH has got one. We still would like to buy one cheap, cause this one the costumer wants back
Bad news is that after fiddling a lot with the carb it runs OK 8300 on an APC 15x8 and 9600 on a 15x6. Stock ignition and stock plug. DARN don't get to sell any ignitions
With the carb adjust correctly it is almost impossible to restart with those settings, but a little choke with the thumb and it will fire right up.
The pump is a pump not a regulator. I cant tell if the engine is running on the pump or just suction. But the needle will adjust to way rich.
I guess well have to get into a plane and see what happens with +- G forces.
Will keep folks post on progress. (由 tkg發表04/29)
Got it mounted and flown. It is a viable engine, it is also a MAJOR PIA to get working right. We flew it with the stock ignition and stock spark plug. 8300 rpm APC 15x8
For those who think its a gasser with a pump carb, so you can mount your gas tank near the CG, forget about it. Think glow engine fuel tank set up.
We flew the engine with the tank in the gasser position and had trouble setting the carb, finally got it to run upright, but it would go way rich in -G flight.
Moved the tank so that it was in the glow position, center-line of carb just below the top of the tank. Again a PIA to adjust. Adjust the carb HS 1 click at a time fly +- Gs, land and adjust 1 more click, fly again. Used tach to keep track of Max rpm so it didn't get to lean. After 6 clicks it would run hard in + or - G maneuvers. Then adjusted the LS for good idle and transistion. Now do the HS one click at a time AGAIN. After about 45 min we got it running and idling very good. A tune up, dial in on a 2c gasser takes about 3 min.
Made a 25min flight on about 5oz of fuel, 70% WOT.
IMHO is is a good upper level engine for the experienced modeler, not a good choice for the newbie 1st time gasser. The operating costs are very low
More diddling to come (由tkg發表05/03)
We installed the FG 20 in my old Orginal Roadrunner ,Plane is about 30 years old. and weights about 15 lbs. Not a 3D plane by any means but a good spot plane with the FG20.
This is a fine engine but as TKG said it does take some careful tuneing . Will run over one hour on a 16 oz tank. Reg gas and 20 to 1 penns air colled oil. Lots of oil out the crankcase breather.
Just got in from flying the GH-20 again today. Flew it several times and put well over 90 mins on it.It ran great through inside and outside snaps never missed a lick. I did have a couple dead sticks getting idle stop and idle down adjusted. Engine seems to run very cool for a gasser.But was not a hot day.
I flew it on the SAito ignitions and our C&H ignition with Rim Fire spark plug both on 4.8 volts. Just about the same .I believe it did have a little better throttle response on our C&H ignition. Ive got to think of something about C&H that is better . How about cost our C&H is less then half the cost of the SAito.IMHO I do not think there is a problem with the carb or ignition.It is just a lot more touchy then a gas burner with a Walbro. We run a `15x8 APC on it yesterday turned 8100 to 8200. TKG has a tach. I flew it some today with a 16x6 APC seemed to turn a little better and pulled plane better. I do not own a Tach they just tell you things you do not want or need to no.
I have 20 airplanes with gas engines and they all run good,maybe I am just not fussy enough. I fly most of them with Futaba fasst receivers with TM 7&8 modules in 9C tramsmitters. I am really getting to like the Fasst systems.
BCCHII AMA 2500. (由bcchi發表05/04) |
發表於 2009年4月21日 11:50 AM
我沒玩過....不速很懂.............天基...林老師好樣的
