Hill Hobbit
Very Strong User
The e-clips can be a real pita though!
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Spada - GoFast 3M
- Thread starter Doc J
- Start date
Red
Very Strong User
I wasn’t, but maybe I should lol. Will you be at Banos? I’ll be bringing a buddy box for others to give it a try.
Red
Very Strong User
You are correct sir! Especially the newer smaller ones. I have a tool for the larger ones, makes it easy. Glad Tomas gives you extras of the smaller ones, the get lost easily lol
Red
Very Strong User
Got all the servos and hardware installed in the other wing tonight. The roots have a nice little pocket already cut out to fit the Graupner style connectors, they just needed minor filing to fit snug. I glued the connector in with thin CA. On the fuselage side I prefer to leave them loose. There is no precut hole, but a couple minutes with a Dremel tool and a jewelers file to clean things up fixes that.
All that is left now is to sort out the servo covers, set the CG, and do a final radio program. Weather looks calm here through the weekend, but I’d to try for a maiden. Fingers crossed.
All that is left now is to sort out the servo covers, set the CG, and do a final radio program. Weather looks calm here through the weekend, but I’d to try for a maiden. Fingers crossed.
Attachments
Red
Very Strong User
Done!
I ended up using a bump cover for the flaps and flat for the ailerons. Since the covers were all red, a quick tape line and some white rattle can made them blend into the scheme a little better.
The reccomended CG range is 98-103mm from the LE. As if by magic, the stripe on the bottom of the wing sits at 98mm making finding the CG much easier. I don’t get hung up too much on finding the exact CG precisely. I put it in the middle of the given range via the finger method and then fly. I’ll adjust based on performance and personal taste from there.
Warning, rant ON. I’ve never understood those folks who obsess over measuring exact CG. Complete waste of time IMHO. The number means absolutely nothing. Put it in a safe spot and fly the damn thing, tune from there. There is no “best” or “perfect” CG for a given design. It ends up where it works best for you! Rant OFF
I’m running 3 flight modes, Speed, Cruise and Landing. Speed allows about 3mm reflex, Cruise has about 3mm camber, Land has crow with about 80 deg of flap. Snap flap, aileron to flap, aileron differential, V tail differential are all adjustable on the fly. These will all of course be tweaked to my liking over multiple sessions. I’m really looking forward to chucking this one off the hill.
Final weight is 2360g. As luck would have it, it has been completely calm here all weekend, so no maiden yet. Maybe one night after work.
As I mentioned before, I’ll have an extra transmitter with me for a wireless buddy box, so if you are coming to Banos and want to take a few laps, come find me.
I ended up using a bump cover for the flaps and flat for the ailerons. Since the covers were all red, a quick tape line and some white rattle can made them blend into the scheme a little better.
The reccomended CG range is 98-103mm from the LE. As if by magic, the stripe on the bottom of the wing sits at 98mm making finding the CG much easier. I don’t get hung up too much on finding the exact CG precisely. I put it in the middle of the given range via the finger method and then fly. I’ll adjust based on performance and personal taste from there.
Warning, rant ON. I’ve never understood those folks who obsess over measuring exact CG. Complete waste of time IMHO. The number means absolutely nothing. Put it in a safe spot and fly the damn thing, tune from there. There is no “best” or “perfect” CG for a given design. It ends up where it works best for you! Rant OFF
I’m running 3 flight modes, Speed, Cruise and Landing. Speed allows about 3mm reflex, Cruise has about 3mm camber, Land has crow with about 80 deg of flap. Snap flap, aileron to flap, aileron differential, V tail differential are all adjustable on the fly. These will all of course be tweaked to my liking over multiple sessions. I’m really looking forward to chucking this one off the hill.
Final weight is 2360g. As luck would have it, it has been completely calm here all weekend, so no maiden yet. Maybe one night after work.
As I mentioned before, I’ll have an extra transmitter with me for a wireless buddy box, so if you are coming to Banos and want to take a few laps, come find me.
Attachments
Red
Very Strong User
Some cheeky git
Hill Hobbit
Very Strong User
I’m an old git!
Doc J
Very Strong User
Hill Hobbit
Very Strong User
I’ve been sussed!
Shoelace
Very Strong User
About the CG rant:
This is very interesting, as I've been putting together a CM Pro Discus. Real cheap model, both in quality and the price I paid. The plans say that the CG is supposed to be around 40mm from the leading edge while old posts out there on the web were saying that they found it to be between 60mm-70mm from the leading edge... A massive difference. I'm going to set it up at 65mm and take it from there, but obviously this makes me a little nervous as it's such a drastic difference. Hopefully when I maiden it at Los Banos it's not going to be ridiculously unbalanced, but even if disaster strikes it won't devastate me.
This is very interesting, as I've been putting together a CM Pro Discus. Real cheap model, both in quality and the price I paid. The plans say that the CG is supposed to be around 40mm from the leading edge while old posts out there on the web were saying that they found it to be between 60mm-70mm from the leading edge... A massive difference. I'm going to set it up at 65mm and take it from there, but obviously this makes me a little nervous as it's such a drastic difference. Hopefully when I maiden it at Los Banos it's not going to be ridiculously unbalanced, but even if disaster strikes it won't devastate me.
Red
Very Strong User
Just take a little time and put the measurements into one of the many CG calculators online. Set the static margin between 5-10% and CG at 30%. This is a safe spot and you can be sure, no second guessing.
Aircraft Center of Gravity Calculator
Calculates Plane's Center of Gravity (CG), the Aerodynamic Center (AC), Mean Aerodynamic Chord (MAC), Neutral Point (NP), Wing Loading, Wing Area and Stall Speed
rcplanes.online
I am not a fan of this on heavy models. For example I would not consider doing this with my ASW-17.
Shoelace
Very Strong User
Yeah... I wouldn't feel comfortable throwing this 2.6M glider on a lawn to check the CG.
jure
Very Strong User
don't let me guess the model's AUW and the capability to launch it above stall speed ...
no problem with my 100" WS "sokol"
thenated0g
Moderator
Im getting those premaiden nerves 
Cg is right on and everything is setup +/- matching the manual but still......
Cg is right on and everything is setup +/- matching the manual but still......
