|Jul 01, 2003, 03:17 AM|
Hey Terry owners....
does your Terry like to nose dive?
Just maidened my Graupner Terry today and it flew really well except it really wanted to nose dive when I took hands off the sticks. It flew fast, solid, and stable. Overall I was pleased except for this trait.
I balanced it correctly (or at least I think I did). The thing was so nose heavy when I finished even with my KAN 950 brick pack pushed as far back as it could go, I had to add 1/2 an ounce of ballast to the tail. (oh, the horrors!)
My question: is this a normal characteristic of the Terry? Giving a few clicks of up trim didn't seem to help much. I have heard from a lot of Terry owners that it wants to nose dive on launching, but don't know if this is normal for flight.
|Jul 01, 2003, 05:43 AM|
you need to shim the leading edge of the wing, under the saddle. i use servo tape or the likes. this will make it a new plane. try it
the balance point is on the wing bolts, i have had a couple of terrys and both needed shimming.
|Jul 23, 2003, 02:43 AM|
I was going to install a wing shim, but I just gave a few clicks of up elevator (about 1/16" above the even line) and it did the trick perfectly. No more nose diving on launch! So, I didn't even need to shim the wing. I love my Terry! It can go from fast to glide in a heartbeat! Make sure on your first launch on your maiden that you give it a few clicks up elevator. Also, when building it, consider which battery to use carefully. I used an 8-cell KAN 950 pack which I had to put all the way back as far in the fuse as it would go, and it was STILL nose heavy, so I added about 1/4 ounce on the tail, and she balanced out nicely. Good luck!
|Jul 23, 2003, 08:25 AM|
Thanks for the info. Regarding the battery, I don't have any of the 500 AR Hobby-Lobby recomends, but I have the 600 NiCds and their 1100 NiMh counterparts. I'm guessing they're probably a little big and heavy.
Do you suppose AAA size would work? I have some of those I'm not using. I also have the 1020 Kokum Li-Poly packs. It seems I have everything but the size the Terry calls for.
Your thoughts would be appreciated. In return I offer some fun videos - http://home.mchsi.com/~meyersbl/hobby/default.htm
|Jul 23, 2003, 08:48 AM|
Joined Jan 2002
Curious thing about my Terry is that it needs several clicks of down trim to fly level. Mine is setup with a 7.2V Speed 400, Graupner 6.3x3 cam folder and 7 500ars. A very nice flying plane. I have been having a lot of fun with it.
Veni Vedi Volavi
I came I saw I flew
|Jul 23, 2003, 08:51 AM|
I use a 7 cell 600 ma AE pack and it works very well. The stock motor and prop draw alot of current. With less weight, I'd even be concerned with how well the plane penatrates into the wind. You don't have to wait for a dead calm day to fly this plane. Watch the cooling of the motor and ESC however, there doesn't seem to be much air getting into the motor or battery compartment. I had to add some small scoops under the canopy to cool the ESC or it just locked in the full on position after about a minute of flying. And add a few strips of filament tape to the underside of the wing.
|Jul 23, 2003, 01:03 PM|
I don't think the AAAs would give you very much run time as the 400 pulls quite a bit of juice. Try the 1100 Ni-Mh pack. You will most likely need to cut the plywood bulkhead to get it to fit. The main thing about using the battery is getting it to fit, balance, and keep the all up weight at 19 ounces. You'll need to experiment a little as you build it. Also, I would not use your Kokams as they are rated for 2 to 3 amps which is much less than what the 400 draws. I don't have a whattmeter, but I'm guessing it's anywhere from 10 to 12 amps. I get about 10 minutes with careful throttle management and that includes a lot of power off gliding. But my 8 cell KAN 950 pack is still being broken in, so I am expecting a little more with every run.
How much run time do you get w/ that pack? I didn't put any air cooling holes in mine, and it runs fine, the motor and batt getting pretty warm, but not hot. Jim Martin, the owner of Hobby Lobby says you don't need to put cooling holes in a plane to keep the motor cool. He says that you can tell when a motor is too hot when it is smoking. Ever since I read that, I've never put cooling holes in my planes, and have never had problems.
Every plane is set up a little different which is probably why you need a different trim setting for your plane.
|Jul 23, 2003, 01:32 PM|
I get 6-9 minutes depending on the amount of low power crusing or aerobatics I do. My motor used to get so hot that it melted the epoxy holding it in place. But the battery never seemed overly warm. I think part of that is the full spinner blocks the air intakes of the motor. That and there is no exit for any hot air out of the battery/radio compartment. I added some slots in the bottom of the fuse near the servos for a exit. That seemed to help.
|Aug 22, 2003, 07:15 AM|
Terry battery thoughts
Yesterday I did read again this very good review:
Also after reading the manual of Terry, I do get the impression that it is build for using 6 cell NiCad.
7-8 cell do fit, but you get a CG (balance) problem.
Right now I use a 7 cell NiCad and added 50gram (behind the servos) and 5gram (tail) correction weight.
This is about 10% of the planes weight.
Next to that 20gram which is added for the extra cell.
This makes the plane about 75gram more in weight.
The manual writes about a maximum weight of 520gram.
Mine is about 540gram with the 7 cell and weight correction.
The terry is very much a performer plane with an optimized enginering design of Graupner. Which makes me think that it performance best with 6 cell... because it was designed this way
|Aug 22, 2003, 08:25 AM|
Richland, MI, USA
Joined Jan 2001
I have only flown my Terry with 6 cells, I can't throw it hard enough in still air to get it to flying speed. If is not up to flying speed it rolls over and hits the ground and brakes. If there is some wind to throw it into then it flys fine. I have talked to other Terry owners and they have all changed to 7 cells to get more speed on takeoff. I plan on making some 7 cell packs to use in it.
|Aug 22, 2003, 09:07 AM|
Did you fly already with 7cells? And did you ad extra balance weight?
I flew it till now with one 7cell NiCad. The performance was great, but I started doubting after reading the review and manual of Terry.
Ps. I made a calculation.
Maybe it is uncorrect
6 cell NiCad = 120 gram
7 cell NiCad = 140 gram
6 cell = 7,2 volt
7 cell = 8,4 volt
From 6 cell to 7 cell an increase of 16,67% in voltage power.
Weight Terry empty with servos and motor for 6 cell use:
Weight Terry empty with servos and motor for 7 cell use (with balance CG correction)
From weight 345 gram to 400 gram an increase of 15,9% (with balance CG correction/ 7 cell use)
Conclusion... if correct: you win 16,67% in voltage power and ad 15,9% of weight.
The manual does mention the fact that the plane must have a maximum weight of 520 gram.
Total weight with 6cell = 465 gram
Total weight with 7cell = 540 gram (included CG balance weight)
Anybody comment this calculation? How to interpetate.
|Aug 22, 2003, 09:12 AM|
Sandston Va USA
Joined Mar 2001
I changed my terry into a brushless system and it flies better than ever now. I installed a astro 010 motor direct drive with the supplied prop and 3 1200 mah lith-poly batteries and the total AUW is under 15 oz or 425 grams. With this ligther weight she is a screamer. It takes a second for the prop to get on step but once it bites in she will goto town. No more problems with motor heat, the 400 would get very hot, and 30 minute flights are no problem.
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