[RCSE] Mounting servos
Gidday all, Thanks for all the replys to my query, I received 5 in the first 1/2 hour and to date 18 hours later, the number of replies is now 23. Thank you all for your thoughts and time. I have the JR servos, and in the past have used a local bond called urethane bond which remains flexible and is foam friendly. However as I had other work to do on the Cross-tail Eraser, I put out the query. I have decide to go Eric Farmers way which is as follows:- Glue a patch of carbon bidirectional cloth onto the top skin (with resin... this will be permanant). Use either foam safe CA or some 5min to glue the servo directly to this. Be sure you rough up the servo case first to get it something to hold on to. The foam safe CA is not to keep from eating the foam in the wing, because rohacell is CA friendly, but rather because it is somewhat more flexible than regular CA and can be broken away to remove the servo. Same with the 5 min. Use only a small dot of adhesive right in the center of the servo to hold it in place. This will be plenty strong enough for flight loads (My F3B and slope racers are done this way), but will be easily removed in case of maintenance. Thank you Eric. Regards, John Ensoll. [EMAIL PROTECTED] LSF 1383 Level II Builder, Flier, Flyfisherman, in retirement. http://www.canterburysailplanes.co.nz RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
[RCSE] Mounting servos in molded wings.
Fellows. . .LSF023 here. I'm reading the various posts on servo mounting and looking at the ideas shown in websites mentioned and would humbly like to make a suggestion for another way to go that is easy, works in very thin wings, firmly mounts the servo and readily allows removing it. I direct you to the RDS website, http://www.proptwisters.org/rds2/index.html. From the opening page, click on INSTRUCTIONS to get into the MAIN INSTRUCTIONS. These were updated just today with NEW pertinent text, sketches and photos. Although what is in there addresses the all-internal Rotary Driver System, the part about servo mounting applies equally well to other installations. I think most everyone is overlooking something obvious, very simple and totally practical. Page to the 2 side by side thumbnail sketches and click to bring these up full-size. Look at what is referred to as "hat bracket" mounting in the left sketch. The base involved does not need to be more than 1/32" or so thick since no screws have to go into it to secure the servo! Instead the screws go into the rails on the base. I find a 1/4" wide rail, capped with ply so it won't split out, to work just fine. I can use 3/8" screws without worrying they'll punch through the skin. Bases can be made as wide as is deemed necessary to spread the loads on the skin. Rails can be as broad as you like and more than one screw can be used each side if you wish. Look. . .when overhead space is a premium, why would you want a thick base under a servo, except to run screws into? Using those auxiliary side mounts as come with the Hitec servos, etc. still requires a thick base for screws and there goes your overhead space if you aren't into $65-$100 super-thin servos. Since a center-mounted side mounting flange is a rarity in lower cost servos, hat bracket mounting is a practical option. In the website mentioned, page to the THREE PIECE WING section and look at the pics there that show such mounting in my GENIE wing, which is rather thin. I used Volz servos, but I tell you there was no overhead space for those neat, laser cut, dedicated ply bases Volz provides. . .NO WAY, so I did it my way! The highlighted word "GENIE" in that section is a link to my 12' span vacuum-bagged competition ship website. This ship is no wimp and requires very solid servo installation using the Rotary Driver System. Page to the MOLDED WINGS section for some suggestions regarding servo mounting in such wings using the hat bracket method. .025"-030" aluminum works well for the bracket. Size them so the screws cinch the servo down tightly so it can't move. I made up some little forms over which to size the brackets for servos I regularly use, rather than trying to individually eyeball and bend them to fit. -- From: Jim Miller [EMAIL PROTECTED] To: The Love Villar family [EMAIL PROTECTED]; soaring [EMAIL PROTECTED] Subject: Re: [RCSE] Servo Mounting Article by Paul Ferguson? Date: Saturday, October 07, 2000 9:15 PM http://bigglesworth.com.au/ssl/technical/servo_mounting.PDF - Original Message - From: "The Love Villar family" [EMAIL PROTECTED] To: "Jim Miller" [EMAIL PROTECTED] Sent: Saturday, October 07, 2000 9:14 PM Subject: Re: [RCSE] Servo Mounting Article by Paul Ferguson? On 10/7/2000 8:39 PM, Jim Miller wrote: Nevermind, found it... Where? -- Keith RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] mounting servos in molded wings
Hi d.o.. . .I may have looked at those ply mounts wrongly, but my impression was that I could not use them in thin wings. I do not recall that they allowed the servo to go in even with the underside of the mounts. I'll get in touch with the friend I gave them to and take another look. No discredit to Volz was intended. In fact, I have been working with Mike and with Kimbrough Products, who do the RDS couplers, to get an adapter molded for use with the Volz servos and those are now on the new 5 adapter tree. If the servo bottom can reach the skin, then to use the mount with the RDS, which may require tilting to aligng the drive shaft between the coupler and the pocket, it would only be necessary to cover the mount bottom with 1/64" ply to keep the epoxy, etc. out of the laser cut openings. I'm real curious of I missed something and will take another look first chance I get to catch up with the friend I gave the mounts to. -- From: d. o. darnell [EMAIL PROTECTED] To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Subject: [RCSE] mounting servos in molded wings Date: Sunday, October 08, 2000 12:13 PM Harley Michaelis writes: I used Volz servos, but I tell you there was no overhead space for those neat, laser cut, dedicated ply bases Volz provides snip I don't really understand why you would not have space for the Volz mounts. They have no "overhead requirements" as they are not as thick as the servo yet let the bottom surface of the servo sit on the skin. Additionally, they require a smaller hole as during installation, and they can be rotated down thru the servo-sized opening. Contrarily, the "hat" method you show would require a larger opening in the wing to allow access for the screws. Also, the plan shows "rails" which are at least as tall, if not taller than the Volz units. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
