Magnus Build thread - TJIRC

[Rcdan12]

I believe my setup is in that power range. Haven't clocked it for speed yet though. Have a look at my video in this thread.

I've see that, definitely fairly quick! What motor/prop setup are you using?

 

[Jarron]

I've see that, definitely fairly quick! What motor/prop setup are you using?

It's a rather old Aveox F27 F5B with a 3.7:1 planetary. it's on 6S spinning an Aeronaut 15x13 prop.

 

[bkohorn]

looking for an extra wing joiner/wing rod for a Magnus or a place to order one- thanks

 

[Rcdan12]

Will kst x08 servos be fine for ailerons? X10 for flaps and a ds215 for the elevator? Any other suggestions?

 

[Wayne]

looking for an extra wing joiner/wing rod for a Magnus or a place to order one- thanks

We can order them for you, just drop us an email: contact@alofthobbies.com and we will get you going.

We can order pretty much any spare parts for any models we currently sell, and sometimes for models we do not sell.

 

[JustinMader]

Is this a common occurrence for carbon planes? This happened on a gentle landing on a soft grassy soccer field.

Suggestions for repair? Just epoxy the hell out it?

 

[Doc J]

Is this a common occurrence for carbon planes? This happened on a gentle landing on a soft grassy soccer field.
View attachment 21945Suggestions for repair? Just epoxy the hell out it?

The epoxy has already failed, Justin. More won't help.

Rough it up and use thick Cyano, but get it straight and clamp it between two straight rulers or pieces of wood to avoid waves.

Doc.

 

[Wayne]

Not normal at all. Would you like a new replacement part? Go ahead and repair that one for now, but we can order up a replacement ASAP.

For repairs I would suggest using a structural epoxy. CA will offer greatly reduced glue strength in this application. Sourcing a thin structural adhesive can be a little tricky though, not going to find it locally. Sand back some of the old material first.

 

[JustinMader]

Not normal at all. Would you like a new replacement part? Go ahead and repair that one for now, but we can order up a replacement ASAP.

Thought about that. I epoxied the tail on though, and I'm worried that if I dig and grind it all out, the seat for the tail will no longer be true. There are a couple of spots on the non-damaged side of the elevator that I see the white epoxy missing from the TE, so this one may have been made with a poor mix? Just grabbed a bottle of extra thick Smith CA, so will give that a go. Worse comes to worse I'll cut it off and make a balsa replacement.

@Wayne guessing there's no ETA on the next shipment from TJIRC? Safe to assume the tariffs will cause an overall increase in the price of our toys?

 

[Wayne]

Should be getting a shipment very soon, they are a little behind right now. Yeah, such is life with Tariffs. I think you will see an increase in much of the hobby as so much comes from China.

 

[JustinMader]

Not normal at all. Would you like a new replacement part? Go ahead and repair that one for now, but we can order up a replacement ASAP.

For repairs I would suggest using a structural epoxy. CA will offer greatly reduced glue strength in this application. Sourcing a thin structural adhesive can be a little tricky though, not going to find it locally. Sand back some of the old material first.

My original thought was to fill the void between the old epoxy with the same epoxy I used on the control horns, then a bead of thin CA along the TE. We'll see how much of a mess I make with it.

 

[JustinMader]

The elevator repair seems to have worked. Hit a new speed record for the Magnus yesterday (got a 20mph boost from a strong tailwind).

 

[Wayne]

That looks so darn nice.

 

[TXpilot]

How much nose weight have people had to use? Seems like its gonna be a lot.

 

[Wayne]

Yeah, it probably will be, but the Magnus likes to be a little heavy. Are you flying slope in Texas?

 

[MartinH]

How much nose weight have people had to use? Seems like its gonna be a lot.

I have 64g in mine after CG trimming. Battery is a 1600mah 4.8v Nimh @ 90g

Martin

 

[Hill Hobbit]

Txpilot, not long back I met a guy from another flying group, and he and his 5 mates all have a Magnus each. He told me that each and every model had the CG at 84/85mm from the leading edge.

Hope this helps…

 

[Donthemon34]

Hi - just finished building my lovely new Magnus and have a question. The instructions say 'Aileron @ tip 6mm up, 2.8mm down'. So, is this 6mm up Aileron at the wingtip end of the aileron or 6mm up at the tip of the aileron alongside the fuselage? Similarly it mentions 'Elevator @ tip' movements. It's just that the amounts of movement given look rather small if it is the tip of the control surface nearest to the fuselage.
Thx

 

[Red]

From the tip of the surface, so wingtip, stab tip. Don't get too wrapped up about the precision, it's all personal preference. Get it ballpark, fly and adjust to suit your liking. Same with CG, there is no perfect one.

 

[JJ Colorado]

Just got an E-Magnus as a cold weather project, and to keep my pure slope Magnus company. Really like my slope Magnus and the CG IS perfect, for me and my flying preferences.

However I am putting a 300 watt motor in the E-Magnus to keep weight down and slope soar it at times. Am I the only person not powering an E-Magnus with a ballistic power system?

The fuse is cavernous and could fit a huge battery and much larger motor, but I think it would be fun to fly with just a 1:1 power to weight ratio, leaving the motor off much of the time. Of course at some future date I could always amp it up, but has anyone else built one as a warmliner glider instead of a blazing hotliner?