雅科夫列夫牦牛9是单引擎战斗机在第二次世界大战中苏联。 牦牛7与同装备的发展，它在到达1942年后期的服务更轻的机身给了新战士一个灵活性，以前的型号所缺乏的。谁飞的飞行员雅克认为其性能相当于或高于梅塞施米特的Bf 109G和福克沃尔夫190A的Fw-3 / A-4的更好。牦牛9是有史以来最大批量生产，苏联战斗机。它在生产保持1942年至1948年，有16,769建成。
斯摩棱斯克战役后，在1943年下半年，著名的自由法国诺曼底-涅曼单元成为阳狮集团 ，并配备了牦牛9。四个航班被命名为鲁昂，勒阿弗尔， 瑟堡和卡昂镇。
•几乎箭在弦上 - 完成最后组装，安装电子与电力系统的选择
800W电机/ ESC /电池（电动）
Overall, a very nice model and looks brilliant. Two issues though, the fibreglass cowl is a bad fit and the control surface hinges all failed a moderate pull test. Check these carefully!!I put an NGH 9cc on it. Nice assembly. Rear wheel to improve. Rotate freely after first fly. I opened the side cowl for better airflow. Flies nicely and land easily.
With my gasser AUW is 3.6Kg. Too much for it. Verticals are very limited. I think better with nitro or electric for real aerobatics. I fly it "scale". Build is on the good side. I crushed 1/4 wing against a pole (new unknown area !) and i rebuild easily the part missing. When i do a quick small loop, she flip also. I don't kwow why. Do i touch the rudder ? if so it seems very touchy. Very pleased with this plane even if it's not for a beginner. Cheap, flyable and nice look. What else ?A really nice warbird for very little money. The battery tray is very weak, but the rest of the build is sturdy and light. The finish and covering job is top notch. Don't hesitate to pick one up.I can't tell you what good value for money this plane is the build quality is great the plane flies as if on rails. I have this plane and the KI 61 Tony built by the same people and is also great value for money. Both planes could do with flaps to slow them down a bit on landing but that is the only criticism I have.flies great with nitro engineMay I just say WOW. Such as nice looking and fun build. You get everything you need to complete this build (for an ARF build). No re tracks but if you spend a little more, the plane comes ready to fit. Good work again.j attends de voir pour vous dire Pour le prixGoing back to my Yak 9 review. Had several flights. I`m using a OS 46 AX for power. Goes like stink. Flights are very stable. The electric retracts need some attention.
The set screw is very small, be careful not to strip the head. I ended up using JB weld to hold them in place.
For take of you need lots of elevator till the tail comes up and then hold it steady till you have enough speed for take off. Other wise the plane will nose in. For the landing, when the plane rolls just about to a stand still use lots of elevator again or you nose in again.
So if you can put maximum elevator throw on your plane. Over all I`m happy with the performance of the Yak, even flew a knife edge.Got the plane within one week. Assembly went well, except for the tail wheel.
The horn was binding. I cut the horn smaller and solved the problem. The cowl does not fit properly over the nose and the measurement from the fire wall to the prop line is incorrect. Measure 3 times and fit it 4 times to make sure the clearance to the spinner is correct.
Next is the test flight which I will post later.I just received this plane and the quality and fit is very nice! Sort of expected the graphics pattern to be off or misaligned but the fit is great and the covering seems of good quality. will add more after total assembly. Got a .75 four stroke to power.