Greg Covey

Reflexed Ailerons

Although not in the manual, Horizon has approved using reflexed ailerons to aid in landing the BAe Hawk. Reflexing is the process of deflecting a portion of an airfoil's tailing edge upward which alters the aerodynamic properties by reducing lift. By adding 1.5mm to 2mm of up on both ailerons from the neutral position, the airfoil generates less lift and drag for the same angle of attack, which has the opposite effect of flaps. The reflexed ailerons allow the BAe Hawk to settle into an easy descent without approaching a stall speed.

Spektrum DX6i Mixing

To accomplish this on my BAe Hawk using the Spektrum DX6i transmitter, I needed two mixes along with plugging the second aileron servo into the flap channel. In this manner, the FLAP switch is used as normal for landing but adds reflex instead of flap.

Mix 1: AILE -> FLAP ACT, RATE D +100% U +100%, SW ON TRIM ACT

Mix 2: FLAP -> AILE ACT, RATE L -100% R -100%, SW FLAP TRIM INH

The Sub-Trims control the aileron centering and are approximately +82 for AILE and +100 for FLAP. The FLAP setting then uses a 0 offset for NORM and about +17 for LAND to achieve a 2mm reflex position.

Greg Covey

The last step of assembly is to glue on the accessories using canopy glue. I used Pacer Formula 560 which dries fast, clear, and flexible.

The wing tip plates mate with a hole in the wing leading edge for easy alignment. The air intake scoops must be trimmed first and then positioned by eye. Masking tape holds the accessories in place while the glue dries.

Greg Covey

My E-flite BAe Hawk was Ready-To-Fly at 35oz without battery. Using the 10oz 3-cell LiPo pack, it weighed 45oz (2.8lbs). Using the 13oz 4-cell pack, it weighed 48oz (3lbs).

mark_d

Just FYI there is a guy with the handle of AirSally over at RCG that is selling epoxy glass intake ducts that seem to work very well for $60. Some of the guys have flow it with up to 6s using the ducts. It lets you get ride of the cheese grater cheater holes and get better performance.

edit: I went back to the thread and looked and had the price wrong. It is corrected above as to what he had for the prliminary, better to just contact Roger for the right price.

Greg Covey

Hi Mark,

Thanks for the hop-up info. Feel free to post contact info for AirSally here if you have it.

Regards.

Pit-Viper 1

My Feedback: (12)

Here's the link to his mod page and the development of the ducts. Very nice work.
pm him for info.

[link]http://www.rcgroups.com/forums/showthread.php?t=968074[/link]


Shane

Greg Covey

Grass take-offs on 4s...no problem!

Pavement take-off test is tomorrow.

Stay tuned for flying photos and video...

blk822

just got mine ,going to us a fury 70mm fan in it. Running on 4s 2200mah batts. getting my fan tomarrow will post power numbers.

Greg Covey

We tested the E-flite BAe Hawk off pavement and really liked its performance on the 4-cell Thunderpower 30C 3300mAh pack. Take-offs were powerful and the Hawk flew very well at only half throttle. Full throttle passes were a real blast of speed! We did not need any reflex turned on for landings and found that the Hawk could slow fly very well within its limits.

The ailerons were extremely responsive so we dialed in plenty of exponential. The elevators were quite normal so we removed the expo from that setting. The Hawk has great performance on a good 4-cell pack and still lands predictably. Although a 3-cell pack should still work for intermediate flyers, by keeping it lighter, do not expect it to have great top end speed.

Overall, this is an excellent fiberglass EDF design by E-flite. Those pilots savvy enough to step up from a foamy will not only love the Hawk's appearance but get a real rush from its performance!

[link=http://www.gregcovey.com/reviews/EfliteBAeHawk.wmv]E-flite BAe Test Flight Video[/link] (22meg)

flying photos by "Papa Jeff" Ring

Pit-Viper 1

My Feedback: (12)

Greg,
Got a question. I am using the recommended fan and speed control from eflite. When I throttle up it is slow to spool up. I am completely green as far as elec. goes, what would cause this and how would I change it. i'm using a Desire Power 3S1P 3300 25C. Also using the Futuba T6EX 2.4 radio. Got everything else done. Also not sure about timing or where it should be.

Thanks Shane

Greg Covey

Hi Shane,

I am not sure what your definition of "slow to spool up" means. A normal spool up time is a few seconds. When flying, you must be aware of this change in flight characteristic over a prop plane.

Regards.

wpotter6

Greg,

I just finished building the BAe Hawk, but have not flown it yet. I am going to use a Hyperion 3300 4S 35C battery, which is very similar to your THP. What expo did you actually use for aileron? I have flown an EFlite F-16 and used 50% Expo on high rates and 30% Expo on low rates. Does that seem reasonable for the Hawk? I found that using the recommended control setups that I had more deflection than recommended for aileron and elevator at high rate settings. Do you think I should dial down the control limits in the transmitter to better match the manual?

Did you try the use of flaperons? Mine is set up to use them if I want to, but probably will not try them on the first flight.

Greg Covey

Hi,

I used 50% expo on the ailerons for both high and low rates. My high rate was reduced to 90% and low rate to 60% throw on the transmitter. Elevator had no expo with low rate set to 70% throw. Rudder had 70% expo but no low rate was set. My memory was that the rudder expo was used to tone down the nose wheel steering on pavement since I did not use a spare channel.

On this model, I would recommend staying close to the recommended throws in the manual and then adjusting expo to your preference. We did not find the need to use flaperons as the BAe Hawk landed very predictably.

Good luck on your maiden flight!

wpotter6

Thanks Greg! Your settings make sense to me and match pretty well with what I sued on my F-16, lots of Expo in aileron and nose wheel steering, none in elevator.

fly210sv

My Feedback: (1)

I put this plane together last week and finally got to fly it yesterday. Flew it 3 times and all I can say is Wow! It looks great in the air and flys like it is on rails. Put the 4 cell pack in and it really goes up. Need to land fairly fast to keep it from stalling. Great plane from
E-flite.

Air Sally

Hello all i just wantwd to pop in here and say that a few guys on R/C groups have had a proplem getting the fan in ...but if you turn it over so the decal is'nt showing it will fit . the mounting tabs are not on th center line . i have been flying mine with 1.5mm of reflex for landing and take off and it is a lot better . i also have full ducting available for this plane ...pm me over on the groups for details. nice build thread you have going here.

Air Sally

Shane your esc setting may be in a heli mode where it spools up slowly to keep from stripping gears.

geeter

My Feedback: (110)

hi, just bought a BAE HAWK and am putting it together now. a little tip, when installing fan and motor unit. the tabs on the fan shroud are not both on the center line. if installing the fan and it doesn't go in and the tabs have to be one in front and one in back of the formers, turn the fan around in a circle [ not end to end] 180 degrees this will allow both tabs to be on the outside for drilling. the decal on the fan may face inside where you can't see it. this is not explaned in the manual. also the ama mag has an article on the hawk. seems they did not know it either, because he said i had to put one flange behind the former and use a tapped hole to mount it.......wrong, wrong, wrong. looking in the side at the fan ,one former is further back than the other. in retrospect one shroud tab is set back further from the center line than the other. you may have to turn you wire boot around also ,it has to face towards the top backside about 20% and the wires going through the bulkhead right like it shows in the manual. hope i helped somebody. also don't use the little set screw that comes with the steering tiller arm. it will strip out and is not easy to tighten. use a 6-32 machine or cap allen screw about 1/2 long so you can tighten it down good. also don't forget the locktite on those wheel collers.............RON

curtusua-RCU

My Feedback: (91)

Hi guys...

I hope this thread isn't totally dead so that no one sees my post! I have a question for those of you who have built this model....

I am just putting my Hawk together and am a little confused about installing the lexan thrust tube. In step 5 on page 4 of the manual, you cut a small rectangular hole for the motor wires to go through. However, when you slide the tube in at the end of the model's assembly, how in the world do you get the motor wires through the tube, especially since they are already installed through the guide hole in the fuselage? I am just now installing the fan unit in the fuselage and it's all I can do to get the lexan tube on the back of the motor fan unit with it OUT of the model.

Sorry if this step is obvious but it isn't to me. Any help will be greatly appreciated!

Thanks...

Curt

fly210sv

My Feedback: (1)

Curt,
I had the same problem. I just sliced the tube to the end and slid it around the wire outlet. I then put a piece of tape on the end to cover over the extened rectangle. I run mine with a 4s 3200mah battery. The thing really scoots along. Take off roll is 50 to 70 feet. Land it hot otherwise it will stall and hit hard. Great airplane that looks fantastic in the sky. Enjoy it and keep an eye on it. It will get far away in a hurry.

fly210sv

jman12

My Feedback: (13)

What is the best way to change out the fan unit? Where do you hold to tighten the collet?

DougB1

My Feedback: (11)

I am trading one of my planes for the Hawk that a guy in the club has. Everything is new in the boxes that E-flite recomends, plane,motor,fan unit,speed control, servos but the battery he got for it is a 2650 14v. Will this battery be ok to use with all the componets. This is all new to me (electrics that is ) I'm a glow and gas guy.
Thanks
Doug

fastturbinejets

I can agree, this is an awesome kit for the price. $137.00 delivered including motor and fan from myatomic.com The plane flies really fast but does not like to slow down for landings in a turn. This plane will tip stall if you are doing this. Mine was a total loss and I have not crashed a jet in at least three years. I guess I was due. I just ordered the f-86 from e-flite. I hope I do better with this one.

Sincerely,

Eddie

fly210sv

My Feedback: (1)

I run a 4 cell 3200 mah lipo in mine. Just make sure your ESC can handle the 4 cell battery. Other than that, it is a ball to fly. It is fast and keep the speed up on landing. You do not need to keep the power on, just keep the nose lowered and add power if you are coming up short. It will cover some ground on landing / rollout. If you get it too slow it will dip a wing and spin in, fast! It takes a pretty good distance to get off the ground 50-75'. Once up it moves. It really gets small in a hurry.

cap10b

Greg,
Is there a big difference in weight and balance between the 3S 3300 battery and the 4S 3300. My plane is really nose heavy and far off from the 80-90 MM CG location. Did you add tail weight? My ESC does not have a BEC and I carry a little 2S-800mah Lipo and dinky regulator that weighs no more than a feather. Everything is stock. I build light no heavy stuff.
Whats the deal.


Johnny Snead
North Dallas RC.