I have downloaded a telemaster plan off the profili website. Its about 33 inch wing span. I would like to enlage this plan to a senior telemaster size.

My question is; will that work? Do i need to reduce the elevator and the rudder area? I am asking this because i have seen on some small scale airplane plans that they show the scale outline and the flying outline for the elevator and rudder.

Thank you in advance for any help.

Should work fine.

Normally, enlarge a proven design vvill vvork better, more stable. the problem is if you vvant to reduce it. VVhat you have to check is the dimensions of pieces, spars, etc.

This is good advise. parts thickness can drive you nuts on a scaled up plane. IE if you increase the size 35%. it hard to find stock that is 35% thicker. The notches in the formers and spar cut in the ribs will not be of a standard stock size. You basicly get to re-engineer the kit. If you have CAD program, you can scale the parts up and then center line the notches and over lay it with a stock size.

One other thing to watch for is that the resized plans maintain their presprective. It is a good idea to draw a ruller on the plans on both the x and y axis before having them enlarged. When you check out the enlargement, both rullers should be the approiate increase in length. Also watch for skewing when the plan went through the coppier.

Don

Flying frog,

Your w is not working??

Mr. Don thanks for the advice. I was thinking about enlarging the plans with a cad program and then printing it that way.

As for spar sizes being a problem..........

Simply draw on the plan. Pick out a spar size that you have and works, and do a little drafting work of your own. Simple and quick solution.

If you use the same angles of deflection (as in scale the throw measurements along with the model) then the model will fly pretty much the same. In fact you may find you need a little more throw to get to the feeling you want. Small models tend to be quite responsive to control deflections so it's not uncommon to see the larger versions of the same design using more angular throw than the little guys.

There's no ideal amount of throw angle. It's up to how you want the model to respond. A pilot that is in training will benifit from reduced throw while a more skilled pilot will enjoy the snappiness of a greater angle.

Depending on how much you blow up the plan you may need to add in wing ribs to support the covering and wing parts better. Similarly with the fuselage you may need to respace and re-engineer the number of formers. Or at least add stringers to better support the side material from bowing. Where and how is a matter of previous knowledge and judgement. Not much help for a newbie I know but this is why it's best to start with plans in the correct size until you learn what works and why.

If your enlargement will only be up to around 15% larger then you don't need to do much other than maybe perk up the wing spar. Otherwise you're in for some serious re-engineering to make the structure work for you.