RDMFC
Would you like to react to this message? Create an account in a few clicks or log in to continue.
Log in

I forgot my password

RDMFC Social Media
RDMFC Facebook Page
Similar topics
Latest topics
» 2019 Llanfair TH Village Fete
Fat Binary Empty2019-07-12, 18:53 by Rich

» Police crash
Fat Binary Empty2019-04-14, 15:36 by Roy

» Bit of indoors
Fat Binary Empty2019-04-13, 16:49 by Roy

» For Sale
Fat Binary Empty2019-03-03, 23:44 by Charles E Cornes

» selling up finaly!
Fat Binary Empty2019-02-10, 16:31 by melfyn

Saturday 7/7/18

2018-07-07, 21:07 by Gary M Jones

I was at the field today between 14:00 & 15:00 all on my own , good flying too. There is a dead sheep along the fence line towards the gate from the pits, I saw the farmer so reported this to her. I hope no one had plans for a BBQ Smile .

Farmer …

Comments: 1


Fat Binary

5 posters

Go down

Fat Binary Empty Fat Binary

Post by Marty 2011-05-27, 17:22

Hi Chaps, I thought I'd just weigh my binary and it comes in at AUW 161gm which is 6gm over the recomended weight but i'm surprised it's so light considering how much glue and glass I used! So all in all I'm quite pleased but the C of G is 2mm in front of where it should be.
Do you guys think that will be a problem?
Marty
Marty
Marty

Posts : 984
RDMFC Bonus points : 1196
Join date : 2010-02-22
Location : Holyhead

http://oddballcustomart.co.uk

Back to top Go down

Fat Binary Empty Re: Fat Binary

Post by Rich 2011-05-27, 18:35

it really needs to be 0mm in front of where it should be
Rich
Rich
Treasurer/Membership Secretary

Posts : 4742
RDMFC Bonus points : 5694
Join date : 2008-11-18
Location : 53.3200°N, 3.4726°W

http://www.futaba-rc.com/

Back to top Go down

Fat Binary Empty Re: Fat Binary

Post by Marty 2011-05-27, 18:46

Yeah I know but if it is a bit nose heavy is it going to affect the flying charicteristics drastically? I can ballance it perfeck if I put a 4mm x 20mm bold on the tail or a 3mm x 20mm bolt in the end of the boom but thats adding weight, or am I being paranoid?
Marty
Marty

Posts : 984
RDMFC Bonus points : 1196
Join date : 2010-02-22
Location : Holyhead

http://oddballcustomart.co.uk

Back to top Go down

Fat Binary Empty Re: Fat Binary

Post by Rich 2011-05-27, 18:57

If it's nose heavy you might not have enough elevator authority or run out of elevator on the landing, can't you arrange the battery a bit further back.

there's only a 2mm range between the CoG anyway 55mm-57mm, if you are 2mm in front of 57mm then it's 4mm out.

Yes you are paranoid
Rich
Rich
Treasurer/Membership Secretary

Posts : 4742
RDMFC Bonus points : 5694
Join date : 2008-11-18
Location : 53.3200°N, 3.4726°W

http://www.futaba-rc.com/

Back to top Go down

Fat Binary Empty Re: Fat Binary

Post by Marty 2011-05-27, 19:08

Thanks Rich. I was a bit of a job to shoehorn the Batt', rx & servo in the pod but I might be able to move the Batt back a little, I'll give it a go.
As for being paranoid, well that comes from inexperience. The more I do the more I will (should) learn! lol
Marty
Marty

Posts : 984
RDMFC Bonus points : 1196
Join date : 2010-02-22
Location : Holyhead

http://oddballcustomart.co.uk

Back to top Go down

Fat Binary Empty Re: Fat Binary

Post by Rich 2011-05-27, 19:19

Sorry I thought the paranoia was just a general question not whether you were paranoid about the glider.
Rich
Rich
Treasurer/Membership Secretary

Posts : 4742
RDMFC Bonus points : 5694
Join date : 2008-11-18
Location : 53.3200°N, 3.4726°W

http://www.futaba-rc.com/

Back to top Go down

Fat Binary Empty Re: Fat Binary

Post by Mark Barnes 2011-05-27, 19:41

mine was at 57mm for the vid that everyone said looked nose heavy so im now at 60mm

Go figure

M
Mark Barnes
Mark Barnes
Club Secretary

Posts : 6607
RDMFC Bonus points : 8240
Join date : 2008-11-16
Location : Rhyl North Wales

Back to top Go down

Fat Binary Empty Re: Fat Binary

Post by Rich 2011-05-27, 20:41

What's the all up weight, to put Marty's mind at rest
Rich
Rich
Treasurer/Membership Secretary

Posts : 4742
RDMFC Bonus points : 5694
Join date : 2008-11-18
Location : 53.3200°N, 3.4726°W

http://www.futaba-rc.com/

Back to top Go down

Fat Binary Empty Re: Fat Binary

Post by Marty 2011-05-27, 20:42

Oh phaff! I just did some jiggery pokery and moved the battery back and got the C of G bang on 55mm and now you say it aint enough! pants! Twisted Evil I'll see how it goes, my incedence may be different to yours! If it is nose heave it'll be a bolt up the boom now. Shocked
Well I have flaps mixed on the throttle os as I throttle down (towards me LOL) at about half throttle the flaps come progressivly down .... smart eh?
Marty
Marty

Posts : 984
RDMFC Bonus points : 1196
Join date : 2010-02-22
Location : Holyhead

http://oddballcustomart.co.uk

Back to top Go down

Fat Binary Empty Re: Fat Binary

Post by Rich 2011-05-27, 20:44

proportional flaps Eh, full flap down throttle, no flap up throttle
Rich
Rich
Treasurer/Membership Secretary

Posts : 4742
RDMFC Bonus points : 5694
Join date : 2008-11-18
Location : 53.3200°N, 3.4726°W

http://www.futaba-rc.com/

Back to top Go down

Fat Binary Empty Re: Fat Binary

Post by Brian Colclough 2011-05-27, 21:24

Don't forget to roll out of the throttle Marty Suspect

Brian Colclough

Posts : 3238
RDMFC Bonus points : 4736
Join date : 2008-11-17
Location : Rhuddlan

http://www.imacuk.co.uk/   http://www.rdmfc.org.uk/

Back to top Go down

Fat Binary Empty Re: Fat Binary

Post by Andy Sayle 2011-05-27, 22:11

A forward CG is better than one that is too far back Smile

Try it with the CG where it is. Start off with some firm (but gentle) javelin type launches, or test glides, to get the elevator trim right. You'll find that as you home in on the right trim for a firm push of a launch, then it requires less up trim if you give it a much harder launch. If you then progress to a full on discus launch, a nose heavy model will try to climb very aggresively on the launch (or you will have the launch trim right, but as you are gliding around, it will be nose diving).

Running out of elevator on the landing could be an issue, but if you drop the flaps by 45° when you are on your landing approach, you will find that you need a bootful of down trim to compensate anyway.

You really need to fly it to decide where the best CG position is. Everyone has there own preferences, I like mine to be slighty more forward compared to Barnes/Rich. You'll know when it isn't to your liking though!

Andy
Andy Sayle
Andy Sayle
Club Chairman

Posts : 4738
RDMFC Bonus points : -487569788
Join date : 2008-11-16
Location : Abergele, North Wales

Back to top Go down

Fat Binary Empty Re: Fat Binary

Post by Rich 2011-05-27, 22:52

23 mins
Rich
Rich
Treasurer/Membership Secretary

Posts : 4742
RDMFC Bonus points : 5694
Join date : 2008-11-18
Location : 53.3200°N, 3.4726°W

http://www.futaba-rc.com/

Back to top Go down

Fat Binary Empty Re: Fat Binary

Post by Marty 2011-05-27, 23:02

Thanks for the input Chaps!
I'm going to the rock tomorrow and the ship on Sunday so the maiden for the Binary will have to wait till I get back! Oh well.
If your not up the rock tomorrow I'll see ya in a month
Cheers
marty
Marty
Marty

Posts : 984
RDMFC Bonus points : 1196
Join date : 2010-02-22
Location : Holyhead

http://oddballcustomart.co.uk

Back to top Go down

Fat Binary Empty Re: Fat Binary

Post by Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum