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General control line discussion => Open Forum => Topic started by: Ara Dedekian on April 11, 2017, 05:48:06 AM

Title: Profile landing gear
Post by: Ara Dedekian on April 11, 2017, 05:48:06 AM


       I have a set of Hobby King carbon fibre landing gear for my Twister. How critical is it for the gear to be mounted straight down. If I angle them forward will they act as a deflected control surface and cause trim issues?

       Ara
Title: Re: Profile landing gear
Post by: john e. holliday on April 11, 2017, 09:24:01 AM
Mount them so there is no deflection of air.  Like dural flat gear they will cause issues if not in line with air flow.
Title: Re: Profile landing gear
Post by: Fredvon4 on April 11, 2017, 11:56:13 AM
I have built 5 profiles now using Aluminum instead of wire gear

When I lay out the LG hard points I figure 0 Angle of attack ---but when I set them with the bolts ---I force in a slight (within the slop of the bolt) a very little positive incidence....makes me think (probably wrongly) that the 1 inch wide strut is flying a bit to off set the drag....


But then, I also ...again probably anally..... round the leading edge to; I hope, reduce drag
Title: Re: Profile landing gear
Post by: Ara Dedekian on April 12, 2017, 08:12:34 AM


          Thanks for the replies. I'll place them straight down. Still trying to complete the pattern and I don't need a plane that will complicate things.

           Ara
Title: Re: Profile landing gear
Post by: Phil Spillman on April 12, 2017, 08:43:14 PM
How ever you mount them is your choice  just remember to place some motor mount stock inside the fuselage where they're going so that your mounting screws don't crush your fuselage!
The hard part is making sure that both halves are drilled straight through so that the screws with the holes line up straight!

Good Luck!

Phil Spillman 
Title: Re: Profile landing gear
Post by: Paul Smith on April 13, 2017, 09:07:21 AM
Right-O.

The trick is to use a drill press before you install the wing.

Also, I recommend boxing in the gear with 1/8" plywood strips so the bolts don't single-handedly control the angle.