tonysmith

Anyone out there had experience balancing for C of G ?????

Built up fus and wing, difficult to fly with BTs quoted settings.
will be glad of any suggestions.....

t_burley

My Feedback: (59)

funny, mine was nose heavy as well
I balanced mine at 5" back from LE as per BT plans,
had a bad tendency to nose over on TO's, and on landings
I ran out of elevator.
I slowly took out nose weight, and am now back at 5.25"
and flys extremely well!

Todd

smchale

My Feedback: (67)

Todd,

If it's not too much trouble, could you post your control throws again at high/low rates...and which you use?

I've had mine running this week but discovered a bad cell in the battery pack that was causing all sorts of 'noise' and problems. Glad I discovered that on the ground....disappointed that i didn't get to fly it yet. Perhaps next week we'll have another crack at it.

t_burley

My Feedback: (59)

will do Sean, I will check them out again tonight/tomorrow
and post them here as to the rates I use.

I cant remember them off the top of my head,
I cant even remember what I had for breakfast!

Todd

p.s. Tony, what does you Spitty weigh? mine is right over
16 lbs. 4 ozs.

Tom Verstappen

Hi Sean,

Is it possible to send me some pictures of your beauty so I can put them on my website?
Or maybe you can put a few on your site?

Thanks
Tom

Raymac

My Feedback: (1)

Burl.....
16lbs. 4oz. is very light indeed !! I have been shooting for 17lbs. but quite concerned that I wont make it. Can you tell me if it is a built up or glass fuse?? also what do you have for an engine??

You can see my progress on the "projects" page;
http:// www.members.shaw.ca/mcdougall.imports/www/

t_burley

My Feedback: (59)

Ray,
thanks, I was lucky to get it that light!?!
we have spoken before if you remember I have used
the glass fuse from Vic, as like Sean has.

I am using the Moki 1.80, and have 32 flights on it now.
I started out with 22 ozs. of lead in the nose per BT
balance specs, it was way to nose heavy.

I gradually have taken lead off the nose, and now only
have 10 ozs. left and flys quite well!

Todd

Tom Verstappen

Hi Ray,

Nice work you did there...
Is it possible for all the Spitfire freaks here that you put the design of your prop decal online?

Thanks
Tom
http://spitfire.e-reality.be

t_burley

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pic

Raymac

My Feedback: (1)

Tom & Todd;

Tom, if you send me an e-mail address I will send you a couple of pages of prop decals which include those for the Spitfire.....I dont think I can post them and expect good enough quality.

Todd, In looking at the engine cooling opening in the front of your cowl, it seems really small......are you sure that you are getting enough cooling? I would like to know if you have good air outlet openings and where you located them????? I would have expected to see much larger cowl openings?????

ProfLooney

Sean you might think abt Aerografix Fiber Optic servo extensions they come like 48" for 35 bucks but can be cut and made to any length. they run sep batts for reciever and servos which will isolate any noise problems. really great stuff and fairly inexpensive compared to a new plane. I am gonna use them in the Hurri and Spit. Go here http://www.geocities.com/traviscouch/hightech.html? theres a lot of info on them how they are set up what they do etc really worth looking into as much as we invest in our scale birds.

Joe

t_burley

My Feedback: (59)

Ray,

I'll send you some pics of my cooling exit area.
I have a "slot" if you will that is in the rear area
of the carb scoop at the bottom, not scale, but it
works

Works good, doesnt get hot at all (around 150-175 degrees)
works really well.

Todd

Raymac

My Feedback: (1)

Many thanks for the pix.....It looks very practical, in fact the airscoop probably creates a venturi effect and DRAWS the air out.....I wonder?? Did you just leave the front hole open or will you use a spring loaded door on it?? I dont particularly like the visible openings but I dont see another way of doing it.

Ray
http://www.members.shaw.ca/mcdougall.imports/www/

t_burley

My Feedback: (59)

Ray, I just keep the opening, well open
I was of concerend about "scale" but more concerened
about cooling. I fly mine, and have fun, dont go
to shows or nothing?

I think Sean was working on a similar layout as mine,
but I think he may have made a spring loaded flapper if
you will at the front, so that it opening in flight, or
he made it removable for flight, but was in place for
static? I cant remember which way he went now!?

Todd

f8fbigbear

My Feedback: (1)

"Tonysmith" ,
Myself and the other scale guys were talking about the"CG Gremlin" Saturday night after a warbird fly-in in Wheeler IN. Unfortunatly there are so many kits/arfs available and so many variables as far as personal preferences and flying conditions by the designer/builder, that it is hard to say if the CG location is wrong according to the plans or instructions. My opinion, and this is strictly my opinion, is that the CG location on a set of plans or instructions is a "starting point" only. I have learned this the hard way more than once. My father, who has been in the hobby since before proportional R/C systems even existed, has used and continues to use the "MAC" procedure to find a starting point, and I stress "starting point, " for proper CG location for a specific aircraft. I use between 25 and 29 % of the mean aerodynamic cor d for my warbirds, if for no other reason but to check against the plans for any discrepencies or variations. I prefer to make my birds slightly nose heavy for test flights, and work my way back. A nose heavy plane flys poorly, a tail heavy plane flys once! Model Airplane News distributes two very good books on model aircraft performance and design that explain these points in detail. these books are:RC Model Aircraft Design by Andy Lennon. And Ultimate RC Flight Guide. Again these statements are only my opinion based on experience. I hope this info helps.

P.S. Sean,

Thanks again for the spit. I cannot wait to get started.

Burl,

The PRU blue turned out awsom, great job. Go shoot down some 109's!

t_burley

My Feedback: (59)

thanks for the compliment!
Problem with the 109's though all I have are
camera's, no guns!

You are correct about the CG as far as I am concerend as well.
I usually use around 25-29% as well, for a reference to the
manufacture requirements myself.

Todd

smchale

My Feedback: (67)

Tom,
Just let me know what you would like in the way of pictures and where to send them. I have a bunch I need to add to my site to wrap up the construction step-by-step I did of this plane. Hope to do that one evening this week.

As far as the flap in the cowl goes, mine stays attached to the cowl and is just hinged to blow open when the engine is running. when the engine is not running and the plane is at rest the flap falls closed. I have some pics of this on my site. One problem i have discovered with this layout is that I couldn't reach in to put my finger over the carb in efforts to draw some fuel up as the flap got in the way of my finger. Once I got the engine running once I don't think this is an issue. I plan on just making up a little 'paddle' that i can feed in there to plug off the carb to draw up some fuel, then remove it to fire the engine. I haven't ran the engine with the cowl on yet but should do in the next couple weeks so then i'll know if I have an overheating problem or not.

f8fbigbear,
Glad you got the kit OK....like I said, I'm not sure what the greater project is, the plane, or fitting all the pieces back in the box after looking at them.
"A nose heavy plane flys poorly, a tail heavy plane flys once!" Good quote!
I have set my CG for the spitfire as Brian shows it on the plans, but i'm sure in time that may change slightly.

f8fbigbear

My Feedback: (1)

I am glad that the box the kit came in has a top and bottom because there is no-way I will ever get all of that "stuff" back into one. I think everything expanded and multiplied after I took it out