iflywhenican

My Feedback: (1)

Good choice, Phantom. Just be careful when you glue the hinges in and DON'T over apply the CA!! A lot of guys tend to do that and it ends up crystallizing the hinges, therefore making them very brittle and if you have vibration, then the hinges simply tear apart.
Another tip, seal all the gaps, (ailerons, tail feathers) with clear covering or just use packaging tape and this will help with the hinges, helps prevent dreaded flutter and makes the plane more responsive also.

mlind

OK, finally putting together the parts needed to put this bird together and I have a couple of servo questions. The servos need at least 98 oz/in of torque according to the Great Planes tech note and it seems that a fast response (.16 to .18) is desired; at least for the ailerons. So:

1) Would the HS-5665MH be a good candidate for the control surfaces?
2) Would using two of these servos in a pull-push setup be sufficient for the rudder?

Thanks for your help.

acerc

I almost lost mine last week. I had just landed from the third flight and was at idle speed and "CRAP", I lost all control. Fortunate for me it was pretty much sitting still. I just finished going through it and apparently last month when I PM'ed it and replaced the battery I did not put the battery strap back on. I am sooooooo happy it did not disconnect while in flight. It is strapped in now and ready for the next trip.

RonMcCormick

My Feedback: (4)

Bet that raised your pulse for a few minutes, a friend of mine was taxing out and his rec bat died, if your on the ground it's all good hey.

Uncas

My Feedback: (1)

I think your aileron servos will be fine. On my first Ultimate I used HS-77BB's before they issued the Tech Note and they worked fine. I am now using HS-5625's and they work great. I think the actual control surface for a given aileron is less than on an UCD 46.

acerc

Being on the ground it was more of a "What the hel"?

mlind

Thanks for the response Uncas ...

I'm re-thinking my rudder servo options and am considering a single servo. Any thoughts out there for a good choice?

thanks

turboflier

mlind,
What voltage battery system do you plane to use? That will help with servo selection. This is a great flier!

mlind

I'm going to go with life 2s 6.6v batteries connected to a Smart-Fly Competition 12 Power Expander. I've been looking at the hs-7954sh:

Size: 1.57 x 0.78 x 1.45" (40 x 20 x 37mm)
Weight: 2.30oz (65.2g)
6.0V 7.4V
Speed: 0.15 sec 0.12 sec
Torque: 333 oz/in 403 oz/in

goreyflyer

Hi all.
ive been reading this thread for a long time but have missed it for a short while!!
im also the proud owner of one in Ireland mine has a DL50 installed with did have a modified AS power pits muffler highly modified to assist in reducing noise. But sadly it's not good enough and i need to fit a canister to her. Does any one know or having seen one fitted to the ultimate? I realise its going to be ugly hanging underneath but unfortunately it's the price I need to pay to keep the db's to a respectfull level!!
Im also wondering about making a hole under the firewall at the angled section in front of the under crakers to create a possible tunnel?? This may well be stupid but I'm all for suggestions.
Many help would be great.
Thanks

agbjarn

Hi all

I have an Ultimate waiting for assembly in the garage. I also have a 55cc engine waiting...

But...

After seeing this video, I asked myself: "why not electric?"

https://www.youtube.com/watch?v=b3KaImk3wGc
I also found this ad with some pictures of a modified GP Ultimate 1.60.
http://www.rcgroups.com/forums/showthread.php?t=2116534

Now the question: I am looking for more information regarding electric conversion of GP Ultimate Biplane 1.60.

Any ideas?

Regards

Agust

acerc

That's just sad!!!

Charlie P.

Pretty nice!

If they put any more ethanol in our local gas I may be compelled.

Have to fill it with baby powder and put a hole in front of the tail wheel for smoke. ;-)

goreyflyer

Exhaust mod done using KS self assembly header sections and a jmb rear exit 4 chamber canister.

agbjarn

This thread has been very quiet for a long time.

My Ultimate is still waiting in the box in my garage until I finish some other projects. The EME55-II engine with an electric starter is also waiting... Hopefully I will have more time soon.

Has anybody used this engine in the Ultimate?

http://www.sdshobby.com/engine-fuel-...c-starter.html

RonMcCormick

My Feedback: (4)

I have the plane with DLE 55 and I have EME 60 in a 32% Pi;lot Decathlon. The mounting is the same except for length of stand offs. Power wise both 55cc so no difference. EME 60cc is the smoothest running engine I ever owned and I count my twins in that group! I dont think your electric starter will make it into the airframe, and I don't think it will be missed, my engine starts with no drama. Hope this helps

agbjarn

Thanks Ron for your helpful answer. I will probably have to remove the starter.
Regards, Agust

flygilmore

Does anyone know why GP stopped making these????? They were such a great flying plane and I could kick myself for ever selling mine!

castlebravo

This was my first GS airplane....got me into IMAC and ever increasing in size airplanes culminating in a 43% Edge and a 42% Dalton 260. I killed it long ago through unintelligent inputs. I just found one for sale local so I jumped on it. It'll be my "cheapo" airplane stuffed with spares I got laying around the shop......DL 50, Hitech 5955/7955's, etc. May even experiment with a gyro and crow....but I'm getting ahead of myself... Cant wait to be aquainted with an old friend!

CB

StZ

Same here agbjarn. I have bought a second hand one from another guy about year and a half ago. It is resting on the self in the basement waiting for my other projects to complete before I start putting it together.
Cant wait.

agbjarn

The motor that I will use is Turnigy Aerodrive SK3 - 6374-192kv Brushless Outrunner Motor, $76.
Speed control: AeroStar Advance 120A ESC Opto, $89.
Programmer for speed control: AeroStar Advance LCD Programming Card, $13.
The old prop is 20"x8". I will probably use an APC-e

You can test the motor in eCalc. Max 80A, 2750 watt. http://www.ecalc.ch/
The motor is very similar to Hacker A60 14L.
The battery will be 10 or 12 cells, 5000 mAh.

(The Coke can is just for size comparision).

Regards, Agust

StZ

I do not like electrics. I do not like the hassle with the batteries and the short flying times. Some people do not mind.
I have seen several failures and crashes due to bad batteries, related electronics etc.
It is nice however, due to their instant power, excellent throttle control and they keep the model clean.

mchadwick

My Feedback: (1)

I love the big electrics. I wonder how he gets to the battery packs.

castlebravo

https://www.youtube.com/watch?v=iW9x_Wkj25c&feature=youtu.be Well....I maidened my "new to me" GP Ulti yesterday......and almost killed it......Was setting up dual rates as someone was talking to me on a 14MZ....yes...a recipe for disaster! Somehow cancelled out my low rate for ailerons and took off with full deflection and no expo.......The landing was embarrassing but it was downwind with no power cause the idle was high and I didn't think I could survive a go-around....be kind in the comments....

StZ

My heart missed a few beats on take off!!!