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Forum: Golden Age, Vintage & Antique RC

01-22-2013, 05:01 PM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

Looks like your going to have her back in the air real soon.:D
Bob

Forum: Golden Age, Vintage & Antique RC

01-18-2013, 10:57 AM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

With everything you have said so far, it really does sound like an AOI thing, but then again it could be one of the tradeoff things at the designer level, anyway, from the pictures it sure is pretty....

Forum: Golden Age, Vintage & Antique RC

01-18-2013, 09:48 AM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

You will need to create a longitudinal center line of your own using the firewall/motor mount that we already established as being set to 0 with the AOI of the wing. You can use a Sharpy to make tick...

Forum: Golden Age, Vintage & Antique RC

01-18-2013, 09:03 AM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

It stands for Fuselage Center Line. It comes into play when we are talking about the AOI between the wing and stab. What is the fuse doing?

Bob

Forum: Golden Age, Vintage & Antique RC

01-18-2013, 07:56 AM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

On my ARF GP WACO I don't know what the design incidence is supposed to be relative to some datum line, but if I block it up so that my Robart incidence meter reads "0" on the lower wing. At this...

Forum: Golden Age, Vintage & Antique RC

01-18-2013, 06:47 AM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

Does it fly level with no up elevator trim and your at a fast idle? The reason I ask is this, if it does not dive on a low power setting and does power on then you might want to change your thrust...

Forum: Golden Age, Vintage & Antique RC

01-18-2013, 04:54 AM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

:)

Forum: Golden Age, Vintage & Antique RC

01-17-2013, 01:24 PM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

The designer bearers the burden of making all these structural and aerodynamic decisions, and he must consider many tradeoffs along the way.[8D]

Bob

Forum: Golden Age, Vintage & Antique RC

01-17-2013, 08:26 AM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

Yes, except an asymmetric/cambered airfoil. Don't take my word for it, Google it.;)

Bob

Forum: Golden Age, Vintage & Antique RC

01-17-2013, 08:13 AM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

All airfoils need AOA to produce lift with the exception of an asymmetric airfoil.

Bob

Forum: Golden Age, Vintage & Antique RC

01-17-2013, 08:10 AM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

No, the smaller you go, the less efficient the lifting capacity is, your forgetting about the Reynolds numbers working against you the smaller you go.

Bob

Forum: Golden Age, Vintage & Antique RC

01-17-2013, 04:55 AM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

This is actually a good point to bring up, for the very reason that the effects of scale volume are not linear. The larger an airframe, the more efficiently it will carry weight, that is why lets say...

Forum: Golden Age, Vintage & Antique RC

01-17-2013, 04:05 AM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

All airfoils with the exception of an asymmetric airfoil require a AOA component to produce lift, when your flying your wing will assume it's own AOA needed to carry the load, but that doesn't...

Forum: Golden Age, Vintage & Antique RC

01-16-2013, 05:49 PM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

I agree, after reviewing the post over and over, that is why I change my question.

Bob

Forum: Golden Age, Vintage & Antique RC

01-16-2013, 05:13 PM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

Are you saying the lift must equal or exceed weight by means of thrust, airspeed and AOA in order to fly?.

Bob

Forum: Golden Age, Vintage & Antique RC

01-16-2013, 12:00 PM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

Designing aircraft platforms is mostly about compromises in my book and any aircraft that doesn't fly neutral to slightly tail high stance just doesn't look right to me. I do agree that that center...

Forum: Golden Age, Vintage & Antique RC

01-16-2013, 09:51 AM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

Yes, a touch of negative AOI on the top wing has always worked for me on my bipes.

Bob

Forum: Golden Age, Vintage & Antique RC

01-16-2013, 05:02 AM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

If an airplane drags it's tail in level flight power on, then it is generally more of an AOI issue between wing and horizontal stab relationship than a C/G issue, he stated that he was going to be a...

Forum: Golden Age, Vintage & Antique RC

12-17-2012, 05:05 AM

Replies: 19,483

WACO YMF

Views: 2,703,803

Posted By sensei

RE: WACO YMF

I have done allot of priming, base coating, and clear coating over polycrylic with great success for the last 20 years or more. I only use Dupont Euro primer, and Dupont Croma Systems base and clear...

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