planenutzz

The dark side of model planes Rev, feel the dark side, like it you will mmmm hmmm

!WarBirds70?

Good Afternoon Reverend
Apparently the system will not allow me to send you a personal message. Can you contact me Via my email. [email protected]
Thank You

marcokemp

Hi guyz, can somebody tell me how long stand offs I need? Would safe me a lot of time measuring and/or trial fitting. I have a Saito FG90R3 with a three blade Ramoser prop.
Thanks Marco

planenutzz

I may have put that info back in the thread, best to measure to make sure everything is perfect. It is not as simple as a standoff of a certain length.

elmshoot

My Feedback: (6)

I recommend measure your set up properly. if you have to error a MM or two short instead of too long as you can always add a washer or two to bring it to position.
Sparky

planenutzz

stand it on its tail with rudder off and secure to a step ladder, position the engine so it sits on the engine mount drill marks then do a trial fit of the cowl, make sure cowl is seated correctly then measure for prop hub face and centering within the cowl.
The centring is critical if you wish to fit a fan.
Adjust as necessary building it up till you have engine at correct distance from firewall. Note I used a piece of 8mm steel plate to add nose weight so might stand offs are a bit shorter than others.
Have a look back over my posts where I did this.

Measure, measure, measure then repeat!

marcokemp

Thanks for the tips guys!

planenutzz

you still flying yours? I am yet to to test fly mine.

elmshoot

My Feedback: (6)

Yes My airplane is still around, I haven't flown it in a year since I am tied up doing other airplane stuff.

planenutzz

There is always something! I have not flown in about 4 months as my landrover is in getting transmission done and there has been back log with parts and getting valve body done.

affas

Hi
​​​​​Have not flown mine in a couple of years.

Anyone out there with a sweetspot rec for CG?

Hueyman86

Hi everyone !

What is the current offer of fans ? Am not happy with 3D printed crap, looking for CNC milled options. Has there been such things in the past ?

If not, and enough people interested, I can draw plans and and investigate to get a batch of 50 units milled

Cheers

planenutzz

Still haven't flown mine! CG seems to be a contentious point on this model. From what I have read the stated position of CG in the manual would appear to be far too nose heavy. I think elmshoot (sparky) had been steadily moving his rearward.

There is a long thread on the German warbird forum https://warbirdforum.de/forum/

elmshoot

My Feedback: (6)

I cant figure out how to post a picture but essentially if you look at the wing mounted on the fuse there is a seam just aft of the exhaust louvers on the side of the fuse and it lines up with a span wise seam on the wing. That is where I have the CG. i think it could still move aft even more. If you are unsure of the mark I descried. Post a picture with the line I just described for verification.
It will fly fine don't get so hung up on the CG.
Sparky

gixer47

I think most people here have bought the printed fan from Reverend. Very strong and fit the standard spinner perfectly.

planenutzz

I have fan from rev as well, it is very sturdy and most definitely not crap!

elmshoot that i about where I have mine, maybe slightly rearward. See photo below. I changed the way I setup the model in the vanessa rig as with it upright and trying to measure on the cowl there is far too much cantilever moment which gives a false reading



Here I am aiming for desired location and before I started to remove lead from the nose. This corresponds to the distance from earlier photo.


This photo shows the model on desired CG, sorry did not get a close up photo at the time. Helps to have a 100kg electric overhead winch on a gantry.

planenutzz

Spinner and fan, I am very happy with the fan by Rev. It was very close on balance with only minor light sand needed to get it to spin true. If you wish to fit a fan then it is critical that it is centered correctly as well as the correct distance in relation to the cowl lip.
This takes very careful placement of the engine. Measure, measure and measure again. I placed mine loose and used shims to ensure it was centered.

elmshoot

My Feedback: (6)

CG looks fine "that dog will hunt"
Sparky

gixer47

I thought about what would be the easiest way to strengthen the center spars without rebuilding like some have and decided to hysol and bolt on 3mm carbon plates. What have others done to strengthen it? I think this will hold up well.

Carlo Vangompel

Hi, I just did setup CG as described in the manual, the plane flies great!

Carlo

planenutzz

as for the reinforcing, I used aircraft grade 5mm plywood and had it shaped to match the fuselage shape. This was epoxied to the existing plywood and hysol around the edges.
Most importantly the disc / holes cut in original plywood need to be filled with a suitable plywood disc and epoxied in.

Bolts then go through the lot.

In your case the only thing with your method would be to have the carbon doubler tapered to distribute the loads, with a sharp 90 degree cutoff on the ends that will induce a potential failure point.