Search: Posts Made By: Larry3215
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03-30-2009, 08:42 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Two things.... 1)Yes - you will be much...

Two things....

1)Yes - you will be much happier with a larger prop :)
That size plane will fly much easier on a 20"-24" - but your going to need more power available.
If you prop up but keep the...
03-30-2009, 08:19 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Thats the best video yet! I disagree on...

Thats the best video yet!

I disagree on being too zoomed in. I like it much better when I can tell what the plane is doing than when its just a vague dot. I would actually have liked it even...
03-30-2009, 02:00 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Very well done Chellie :D Welcome to the...

Very well done Chellie :D

Welcome to the Giant Scale Foamy Builders and Flyers club!

Its a relatively small group and now you know why. It takes a pretty fair amount of skill, time, work,...
03-29-2009, 11:03 PM
Replies: 725
Views: 133,024
Posted By Larry3215

Congrats Chellie!! But....... you have to...

Congrats Chellie!!

But....... you have to tell us more than that!!!! :D
03-25-2009, 03:55 AM
Replies: 725
Views: 133,024
Posted By Larry3215

If she gets it to balance at 7" back that should...

If she gets it to balance at 7" back that should be fine. A tad nose heavy but not toooo bad.

Thats right at 28% MAC which is pretty conservative but shouldnt be risky. It will probably take a...
03-25-2009, 03:47 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Goes like this? Liftoff, snaproll, crash? :)

Goes like this?

Liftoff, snaproll, crash? :)
03-25-2009, 01:22 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Naw, not if your used to fly them that way :)

Naw, not if your used to fly them that way :)
03-24-2009, 09:28 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Sounds good to me :)

Sounds good to me :)
03-24-2009, 07:47 AM
Replies: 725
Views: 133,024
Posted By Larry3215

The "proper" way to do it would be to calc each...

The "proper" way to do it would be to calc each wing and spot its individual CG point and then split the difference - like in that picture you posted above.

As long as the wings are the same you...
03-24-2009, 07:45 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Oh yeah - thats how the calculator works! Duh to...

Oh yeah - thats how the calculator works! Duh to me!
03-24-2009, 07:44 AM
Replies: 725
Views: 133,024
Posted By Larry3215

That pic sure makes it look like the sweep is...

That pic sure makes it look like the sweep is more than 3" but if thats what it is, then your calcs look pretty close to me.

By the way you can use the method you did for the over all cord as long...
03-24-2009, 07:34 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Here is the CG calculator I use. ...

Here is the CG calculator I use.

http://www.palosrc.com/instructors/cg.htm

You dont need to worry about static margins - just choose a percentage of MAC.

25% will be a very safe percentage...
03-24-2009, 07:20 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Im confused Chellie. I thought your cord was...

Im confused Chellie. I thought your cord was 13.75" Where did you get the 18"?

Also, are you sure about the sweep distance being only 1.5"? From the picture you posted it looks to me like its...
03-23-2009, 06:41 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Oops - I forgot to add in the weight of your...

Oops - I forgot to add in the weight of your battery - corrected the numbers above.
03-23-2009, 06:34 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Chellie, Your bipe has roughly the same wing...

Chellie,

Your bipe has roughly the same wing loading as my XXL Polaris with a little less power loading.

However, because of its wing span it will FEEL like it flying slower.

The Polaris...
03-23-2009, 03:27 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Wow! Awesome job Chellie! Where did you...

Wow!

Awesome job Chellie!

Where did you decide to start with the CG? I'd recommend trying right at the rear bolts on the cabane struts that hold on the upper wing. That should be nice and...
03-19-2009, 03:59 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Sorry Chellie, its waaaaaaay too late now :) ...

Sorry Chellie, its waaaaaaay too late now :)

At this point you have no choice but to fly it. Once you have flown a big bird - especially one you created yourself - and double especially one you...
03-15-2009, 03:55 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Screw the dryer! Finish the bipe, then hang...

Screw the dryer!

Finish the bipe, then hang your cloths on the wings and blow dry them with the motor. The delicate items and 'unmentionables' can hang off the tail feathers :D
03-07-2009, 05:46 AM
Replies: 725
Views: 133,024
Posted By Larry3215

A buddy of mine sent me these pictures of how he...

A buddy of mine sent me these pictures of how he was aligning the wings on his bipe.

It's a variation on an old wood workers trick for getting surfaces paralell. The wood dowels are called "story...
02-28-2009, 04:23 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Is it done yet?? Are we there yet?? ...

Is it done yet??



Are we there yet??



Is it done yet now?
02-21-2009, 02:16 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Good idea on the tail wheel rubber band Chellie....

Good idea on the tail wheel rubber band Chellie. In fact, Id even use a smaller rubber band.

When it will save you is in a touch down in a cross wind. You're more likely to pop the gears in the...
02-05-2009, 05:09 PM
Replies: 725
Views: 133,024
Posted By Larry3215

What? No pink? ;) Lookin reeeeeeealy good...

What? No pink? ;)

Lookin reeeeeeealy good Chellie!
02-05-2009, 02:32 AM
Replies: 725
Views: 133,024
Posted By Larry3215

I posted the wrong link the first time around...

I posted the wrong link the first time around Chellie. The new link is easier to use I think.
02-05-2009, 02:27 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Chellie, if your wings have sweep and are...

Chellie, if your wings have sweep and are staggared like in the drawings you had at the beginning, your going to want the CG a lot further back that 25% of the top wing.

Here is a wing CG...
02-04-2009, 05:58 AM
Replies: 725
Views: 133,024
Posted By Larry3215

That technique works well on smaller models but...

That technique works well on smaller models but on giant scale its really hard on the rudder servo gears when you're landing - especially if there is any cross wind at all.

Id recommend keeping...
02-03-2009, 03:37 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Looks great so far Chellie! But dont forget,...

Looks great so far Chellie!

But dont forget, you are not allowed to go flying until this bird is finished!! No goofing off when there is work to do!! ;)
01-25-2009, 08:13 AM
Replies: 725
Views: 133,024
Posted By Larry3215

I have a couple of suggestions for you Larry on...

I have a couple of suggestions for you Larry on your Dajet.

That design is not going to work as a canard. The hinge line on the controls on the forward wing are too close to where the CG is (or...
01-24-2009, 11:13 PM
Replies: 725
Views: 133,024
Posted By Larry3215

Is that a stagger wing jet?? :eek: You have...

Is that a stagger wing jet?? :eek:

You have got it bad!! ;)

http://www.wattflyer.com/forums/attachment.php?attachmentid=91475&d=1232826120
01-24-2009, 11:11 PM
Replies: 725
Views: 133,024
Posted By Larry3215

I agree Larry - dont do it! We know We can tell...

I agree Larry - dont do it! We know We can tell from the pics of your shop that you've got it bad. Really bad. Just hang in there and remember - the cure is to start another project! ;) :D
01-22-2009, 06:07 AM
Replies: 725
Views: 133,024
Posted By Larry3215

Open? Curtain call? Cool! Break a leg!

Open? Curtain call?

Cool! Break a leg!
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