Great Planes Yak 55
 

Is the Great Planes Yak 55, with a 280 size brushed motor with a 5:1.1 gearbox, 3 cell 1500mAh lipo, a good package? (these are the specs tower hobbis gives). Will this plane be able to fly aerobatics with the stock motor?

RE: Great Planes Yak 55
 

Yes. This is the exact setup I have been flying for about 6 flights so far. The airplane will hover on the stock motor, but just barely pull vertical after the hover. I stopped at six flights because the brushes were not making contact on the commentator (sp?) and I was loosing power. Recently repaired and look forward to practicing more 3D.

I get about 15 minutes of flight, so you might want to consider 2 or 3 1200 mAh batteries to get better flying performance with slightly less time (but maybe more batteries) Three 10 minute flights with a good airplane is better than two 15 minute flights with a heavy poor flying model.

RE: Great Planes Yak 55
 

hey i just maidened my yak this weekend. still fine tuning it, just wondering, explain more about the brushes coming loose? mine did not have unlimited vertical or hover at all with a 1250 3c pack, but had a little pull out with a 1500mah pack (still not enough once the tail started sliding). i wonder if i am having the same issue. i went stock because i was told it was enough (by people who saw it and who had no reason to lie to me). or maybe i just built it a little heavy?

RE: Great Planes Yak 55
 

I have about 50 flights on it now with a MP Jet geared brushless in it. Definately a better plane with the brushless vs the stock setup, also using 3s 1500 lipos. After 50 flights the plane does need some maintenance, cause rear elevators start to come undone. Great fun plane though.

RE: Great Planes Yak 55
 

i have 2 new stock motors, gearbox's, props, and prop adapters never ran or installed...would let go for cheap.......email me at [email protected] make offer...


the yak 55 was my first plane after many years of gas and electric rc car racing, i thought a few days on fms flight sim would have prepared me...but i am having a blast, learned to hover on 2nd time out.......this plane rocks, i am still very touchy at the controls though

just for comparisons....i am running the yak 55 (with 1500mah 3s was 13 oz) , himax, 4015, 4100kv motor with gearbox running 6:1 gearbox with 11x7 slo fly prop, with 3s battery , 26 oz of thrust, plane needs nly 21 to hover comfortably, (been reading alot about specs and stuff) (1st ran 1500mah, just bought 2 3s 900 mah kokams, for less weight) also running pheonix 25, by castle and airtronics vg6000 with 94091 micro servos............

RE: Great Planes Yak 55
 

Just test flew my GP YAK and had very bad elevator flutter at all but very low throttle. Any ideas?

RE: Great Planes Yak 55
 

I maidened my yak yesterday and had the exact smae elevator flutter problem at high throttles (as i'm novice i nearly lost the bird). I was able to reduce the flutter by moving the push rod to the outer hole on the elevator horn and the inner hole on the servo hole and redo the throw. I suspect some radio interference somewhere. Any idea?

RE: Great Planes Yak 55
 

I don't expect you have any radio problem. Look on the back page of the instruction manual for the answer. Its OK to feel stupid as I did; who ever reads instructions, much less the back page. I've been out of town and have not tried the fix as of yet. Good luck.

RE: Great Planes Yak 55
 

DUH big time!!! Although i'm sure i've read the instuctions before ... the last page!! i never gone that far :)

It looks like a good solution i'll try it next week. Keep me posted please, let me see how it goes with you.

RE: Great Planes Yak 55
 

I tested flying the model yesterday after applying the fix man it really was great the flutter disapeard completely i was almost always on full throtle :) Thanks for the tip.

RE: Great Planes Yak 55
 

Here are some major upgrades that I made to make this plane really perform. (after 2 years of flying)

First, I went through 2 stock 280 motors with 5.5:1 gear drive. Both times the motor suddenly quit working. The brushes were worn completely down. Then, I moved on to GWS 350's with 370 motors and 6.6:1 gear boxes, and Thunderpower 1320 batteries. The increased motor performance, and lighter battery were a huge gain in performance, but the motors wouldn't last.

Finally, after 2 more GWS motors (they were free), I've finally purchased a Brushless. The motor of choice was a Welgard brushless from BPhobbies and a Thunderbird 18 ESC. Only $21.95 for the motor. I've gone with a 9x4.7 GWS prop for plenty of power. I can hover, knife edge left to right and right to left, torque roll, Blender and Waterfall without fear or lack of power to get out of sticky situations.

I've bent the shaft on the gear boxes from mistakes twice, and popped the rudder off once, and the plane keeps coming back for more.

If you have any upgrades you would like to mention, please post them for us.

Thanks

With reguard to the above post, keep the speed down. The full flying stab isn't made for highspeed flight. It likes slow 3D.

RE: Great Planes Yak 55
 

I am looking at buying this plane and was trying to put together a brushless combo and I have a few questions maybe someone can help me with. I am new to electrics so keep that in mind.

1.) Would the GP Rimfire 28-30-750 be a good match on direct drive? or would I need the larger 35-30-950? The 28mm can is lighter and would work with a smaller ESC so that is positive but not sure about performance. They also make a 28-30-950. Would that be better than the 750 version? How much difference would I notice?

2.) how do you mount an outrunner on a stick type mount that is used on this plane?

Thanks for the help in advance.

RE: Great Planes Yak 55
 

I have converted it to brushless after 6 flights with the stock setup. I got unlimited vertical performance with the new AXI 2217/20

RE: Great Planes Yak 55
 

Im probably going to buy this plane