GWS Top Electric Flight FAQ
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I have several of your airplanes all running the EPS-300 power systems using the same props that come with the kits--I find the 9.6 / 730 Ni-MH packs are faster and stronger than the suggested 8.4 /730 packs Is the higher voltage going to hurt the motors?
Yes. it can shorten the life-span of motor to use the 9.6/730 Ni-MH packs.
How fast does the GWS A-10 fly?
Our Aero-modeling engineer said, it is about 40Km/hr ~ 60Km/hr normally.
What is the approximate 'scale' of this model(A10)?
I purchased an A10 Warthog and I am very pleased with it but I found on its maiden flight I could not get more than about 15 ft in height. I am using a7.2nic cad battery pack and I think I need more power.What would you suggest that I use Thanks in Advance
Normally, it is about 15ft ~ 30 ft in height.
When I was balancing my new Spit fire I noticed that the fuselage was bent to the right. I was wondering if there is a way to correct it without cutting it as I have already painted it. I do not know how this could have happened because the way you designed it there was only one way to glue it together and this did not happen with my other plane. I do have to say I like how easy to build and how well they fly. I will attach a couple pictures for you to see.
Please kindly try to change it according to
the following 3 steps as soon as you can, we are sure that you have
well-experience in various models.
I purchased a SLOW STICK 2 days ago and have just finished assembling it. I found that the wing does not sit level on the plane, but "leans" to the left. I have checked the dihedral and it is the same on both sides of the wing (with one wing side sitting flat and then measuring the dihedral on each side). It does not line up with the horizontal stabilizer, but the stabilizer measures level on both sides when sitting on a table. The aluminum "stick" does not appear to be twisted, and the wing support brackets appear to be square to the fuselage and have no warp. I brought it to my hobby shop who confirmed my findings and suggested I shim up the low side. I will have to shim it 1/8" or more the get the wing level. I don't feel that this is the best thing to do, particularly since the plane is brand new and has never been flown.
1. Normally, the injected airpalnes with foam
material could not keep a perfect leval condition, except the laser-cutting
I got an EPS350C-D power system for my Slow Stick as your engineer suggested. What Propeller do you recommend?? The same EP1180 prop as used with the EPS300C, or is there another choice.
For better performance, EP1180 OR EP1080 our engineer recommends.
I've purchased a EPS-400C (BB, C gearbox). Can you tell me if this is an acceptable power system for the E-Starter model plane? If so, what is the expected amp draw with 7.2 V power supply and a 8060 or 9070 propeller?
That will be about 7A current draw, for 7.2v and 9070 prop on Estarter. But we do not recommend Estarter w/EPS-400C powered by 7.2v battery pack, 8.4v or 9.6v 750mAh battery pack with ICS300/ICS480 would be more appropriate. 7.2v and EP9070 do not give sufficient power to this airplane.
I recently purchased the A-10 kit with the 2 EDF 50 engines in it. What is the largest engine I can put in this kit? I would like to add your retracs to it but i think it might be to heavy. Also, I have a 6ch. Futaba I want to use with this kit is there any modifications I need to do(ie..servos, transmitter, etc.)? And finally, Do you make any other ducted fan models (f-15, f-16, f-14, Mig23...etc) and if so where can I buy them? Thank you for your time and forthcoming response.
You can upgrade GWS A10-EDF50 to A10-EDF55 by buying bigger nacelles and EDF55 motors. The EDF55 upgrade pack is available now, you can call up local hobby store to buy one. But if you can wait a little while, GWS will announce new high voltage EDF50 duct fan unit in June. The high voltage EDF50 motors can be used on A10 with 9.6v battery pack which makes the airplane aerobatic.Retract for A-10 is too heavy. There is no need to make changes for using Futaba radios on GWS airplane. GWS produces both Futaba and JR compatible radios, servos and accessories.
My question is this.I've assembled the PT-17 and ballanced it as close as possible using a Great Planes ballance machine.However,this ballancer will not allow me to get a proper reading at the leading edge of the lower wing as stated in the manual that came with the kit.I've sent the plane up and it was a bit of a handful.I'm sure this is only due to a tailheavy situation.Your products have really opened up the hobby to me,as well as others,I'm sure.I've always liked the lines of the Stearman and am anxious to see mine in the air.Is there any way you could give me a measurement of the C.G. point from the leading edge on the upper wing so as to properly ballance this plane for true flight.Being a bi-plane,ballance from the upper wing is very easy,as in the Tiger Moth I just finished.
The C.G. (Center of Gravity) is located 50~55mm from the leading edge of the upper wing, our engineer advised. If there is any questions, please do let us know.
I am a novice in using transmitter. I just bought a GW/R-6NII 6-channel transmiter. May I know how can I use the 6/B slot as 6th channel and battery connector. I would appreciate it, if you can tell me the details of the connection.
Please use Y type wires for your need
I just purchased a new EPS-400C electric motor as a replacement for my GWS "E-Starter" Model airplane. However, I am confused about using the correct propeller for this model and motor. Would you please make a recommendation for me so I can use the right match?
Our engineer suggests that you can use the EP1060 propeller in EPS-400C power system for "E-Starter" airplane, kindly refer to further information at http://www.gws.com.tw/english/product/airfly/tm400.htm.
I've read your manual of the A-10 over and over, and find one difficulty. That of your measurements of the plastic tube PQTUBH035 I've found three areas where this part is used. The piece provided if cut to the specifications mentioned in the manual of 235mm, 2mm, and 200mm if I use these specs, there is not enough tube provided. Looking at the illustrations provides me a confusing picture. From what I can see in the pictures, the measurements (in inches) should be approximately 7.5 inches, .5 inches, and 4.5 inches. Would you please clarify these measurements? I also noted that there should be nine (09) pieces of PXTPAF-4J-1490R Cowling Fixing Screws as noted in the manuals parts list. I only received four (04) pieces. Is this notation in error, or do I need to obtain additional parts to complete this model. Lastly, there seems to have been some upgrades on your propulsion system for this model. Do you have any suggestions on upgrading this system so that the model will fly with a bit more authority than reported in several reviews and columns that I have read?
1. The plastic tube has two
pieces (ψ3x240mm x 2pcs), it is enough
Can I really use EP1080 of propeller with my E-starter ? Will the flying characteristics change with EP1147 or EP1170? What type, EP1147 or EP1170 prefer for beginner? The weight of my E-Starter is 400g without batteries. When you write "the flying weight 350~450g (12.3~15.9 oz)" does it includes the weight of the battery?
If you use the gear type D, it would be better to use EP1147. If you use gear type D with EP1080, then the power will not be enough for E-starter. The best combination will be EP1147 with gear type D and EP1080 with gear type C. The flying weight 350~450g is just a range for your reference. 400gr of your plane is at the normal range. It's included the weight of the battery.
I'm using GWS 7.2V/270mAh NI-CD battery packs in your GWS Beaver DHC-2, electric with the stock motor. I am using these battery packs which I have recharged many times. I have a wall charger that tells me when the charge is complete through a lite that starts to blink. I charge the batteries at 1/10 the mAh. Therefore, I charge the 270mAh battery at 270mAh. They usually recharge in about 1.5 hours on my charger. Then I check the voltage which always reads a little higher then 7.2V after being charged. However, when I use the battery I get 2 minute flight times and the battery cuts the motor off. What is the problem with these batteries? Why am I not getting better run times on these batteries? Can these batteries be going bad? Am I not charging them correctly? Can you recommend a different type of battery that will work with this model that will give me longer flight times? If so, where can I purchase these batteries?
If you use 270mAh Ni-Cd battery pack, it's very normal to fly 2 minutes. We would recommend you to use 730mAh or 750mAh (Ni-Mh) battery pack. That would be more powerful and the flight time is about 6~7 minutes.
I recently purchased a slow stick with an EP-1180 gw/EPS-300C power system. I was disappointed with my first flight. Upon takeoff, it immediately began to stall, any attempts to level the plane resulted in more stalling. Drastic altitude losses occurred when I tried to turn away from an obstacle. I am new to R\C flight and feel a bit discouraged. what can I do to achieve the relaxed, stable flight that I expected and sought from this kit?
With reference to your inquiry concerning Slow Stick, Please check the C.G position. You are availed to refer to " CONTROL THROWS & C.G." on the manual instruction of Slow Stick.
EDP400 motor system is faster speed for P51D Mustang,ZERO,Spitfier and Corsair than EPS350C? I will buy EDP400 system so please let me know your comments.
We don't recommend EDP400, the power is not enough. If you would like to faster speed, please select GW/EPS-350C-AS/BB plus propeller 8060, battery 9.6V.
I purchased an A10 last year, it has the EDF50A fan motors. It weights 12.3 oz without batterys. I have tried to fly it with 8 cell AAA 730ma NiMh batterys. It has very little power, bad flyer. 7 cell 350ma NiCd seems to have less thrust than the 8 cell. What can be done to make it fly like it should, without going to the expense of replacing the motors with larger one's ?
With reference to your question concerning A10-EDF50. Please try to use 8 cell 3500mAH Ni-CD battery, as it will be more light than 8 cell AAA 730mAH battery, and have enough thrust.
Can the GWS floats be used on the EZ Starter[ or Beaver] with the 350C motor?
Yes, the GWS floats can used on EStarter-EPS350C and DHC2-EPS350C (Beaver), please see the attahced pictures for your reference.
I just pruchased the above mentioned electric airplane. The manual says that I can spray paint the upper portion of the wings and cowling. Is this optional or will painting these parts add to their strength? Also, can I spray aint the fuselage?
Yes, please use the spray paint for foam. If you are not sure, please make a test the paint the small area.
What is the largest mtors I can get to upgrade my A10 please e-mail me back
If you choose A10 EDP series, the EM300H motor is the largest motor.
I just bought your E-STARTER plane Trainer Kit(EPS 300C) from my local hobby shop. What elso is needed to complete the plane and get into the air. Please list your components.
Except the Airplane kit, you still need:
I have a Zero park flyer and want to increase flight time and power. I am using a 7.2V, 350 ma battery pack. I have been told I can use a 9.6V, 730 ma battery Pack. Do you recommend this? What is the Maximum I can use?
You are available to use a 9.6V 730mAH battery pack, and use EP9070 propeller. When your Zero on Flying, please do not control full speed for protecting your motor.
Could you tell me the GWS engine airplane SKY HERO's wing shape is fully symatric or semi symatric?(That is, it is a trainer airplane or a stunt airplane?) ATT pro 36 engine is available to fly it?
The SKY HERO's wing shape is semi symatric and trainer airplane. ATT pro 36 engine is available to fly it.
Built your P51D-300C plane and using 8.4 V. NiMH battery or 9.6 V. battery. Try to fly, but plane only goes for about 3 feet up and tilted and right felt to the ground. I try to start from hand, and it doing same swinging left and right for a 3 second falling on the ground. At full throttle it not going up. It sound like it does not have power. We went to Venture Hobby store and they check battery and motor and can not find any problem. I think they do not have equipment to test GW/EPS - 300C power system. I use same radio to fly Tiger Moth and it fly perfectly. Please help me to find solution for P51 not flying problem, and the way I can test power system, speed controller and receiver.
1. First of all, please check your C. G.
point. Make sure to push your battery is at the forefront point.
I am in the process of building your GWS Zero and have a question. What is the best way to break-in the electric motor that came with the plane?
Please be advised that break-in the electric motor for Zero as below 1/3 throat 2 minutes and 1/2 throat 2 minutes.
GW/F4U-EPS-350C/B refuselage assembly. Manual says to drill 3mm holes into the L & R fuselage pushrod guide slot. There is already 2 holes on both sides of the fuselage that measure over 1cm (1/4 inch) Why is there 2 holes on both sides of the fuselage? Also, these holes are too big for the plastic tubes to attach properly. Any ideas?
The holes of the fuselage are quite normal situation. No need to worry about that. It wouldn't affect any flying performance. Our pilot suggest that you may use the stickers to cover it up if you think the appearance is not so good.
What's the relation between thrust to weight applied to a electric model? Is there a formula available?
There is no such formula available. Mainly, the relation between thrust and weight is depended on the characters of the planes you have. Different planes may have totally different relation. Therefore, it's really hard to tell you a certain formula for determining the relation between them. In our opinion, the best way to find out that so far is to try equipping with different combination under your good knowledge of electric planes and to see which one works best. Of course, failure might happen when you are doing the try, so you better start with the similar equipment and then go further. Surely you can find a lot of fun out of it. If you are not very experienced, it's better just to follow the manual of your plane.