[RCSE] The proper way to add washout/twist...
Hi folks, Just curious if anyone knows how washout should be properly added to a wing. I don't mean how much should be added (that I understand fine), but rather how the wing should be twisted. Do you rotate the tip section about the 1/4 chord point? Do you rotate the tip section about the LE? Does it really matter? Thanks, Adam Adam Till Mechanical Engineer 403-270-9200 (ext 154) 403-270-0399 (Fax) UMA Engineering Ltd. 2540 Kensington Road NW Calgary AB, Canada T2N 3S3 RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
Re: [RCSE] The proper way to add washout/twist...
The 1/4 chord point would be the best choice. But it's not that big of a concern usually. If you're cutting a foam core, then yes. Rotate the tip template around the 1/4 chord point. Bill Swingle RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
RE: [RCSE] The proper way to add washout/twist...
Thought so, and that's what I'd usually do. This time I'm doodling a little flying wing that has twist from 1/2 span out, however, and having a straight LE would be helpful as a reference. Any guesses as to what doing this rather than twisting at 1/4 chord would do? Cheers, Adam -Original Message- From: Bill Swingle [mailto:[EMAIL PROTECTED] Sent: Friday, December 03, 2004 10:07 AM To: Adam Till (Cal); [EMAIL PROTECTED] Subject: Re: [RCSE] The proper way to add washout/twist... The 1/4 chord point would be the best choice. But it's not that big of a concern usually. If you're cutting a foam core, then yes. Rotate the tip template around the 1/4 chord point. Bill Swingle RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
Re: [RCSE] The proper way to add washout/twist...
Twisting around the LE will add a bit of a pitching moment. Usually. However, a flying wing USUALLY will have a near-zero pitching moment airfoil so it's a non-issue. Besides, if it's a foamie, just twisting it with you hand and applying a heat gun, will usually twist around approximately the 1/4 chord point. So it's no problem. Really I've done it dozens of times. Don't sweat it. Bill Swingle RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
RE: [RCSE] The proper way to add washout/twist...
Not an EPP foamie (bagged composite), so I have to make the decision before I cut the cores, but I'm sure it'll work out fine. I'll throw in an extra 1/4 degree of twist (it requires 4 already). Thanks again, Adam -Original Message- From: Bill Swingle [mailto:[EMAIL PROTECTED] Sent: Friday, December 03, 2004 10:17 AM To: Adam Till (Cal) Cc: [EMAIL PROTECTED] Subject: Re: [RCSE] The proper way to add washout/twist... Twisting around the LE will add a bit of a pitching moment. Usually. However, a flying wing USUALLY will have a near-zero pitching moment airfoil so it's a non-issue. Besides, if it's a foamie, just twisting it with you hand and applying a heat gun, will usually twist around approximately the 1/4 chord point. So it's no problem. Really I've done it dozens of times. Don't sweat it. Bill Swingle RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
