Can someone confirm for me that the perfect exhaust size for the Wemo minifan (70mm) is 60mm's?

Or is it something else? A search on the boards didn't find it.

60mm - 2.375 inch is pretty close to what most of the 70mm arf mfg's have theirs. I think it depends on how slippery your airframe is as to how much you can effectively squeeze out of the efflux. Keep the diameter a fuzz larger for fixed gear
http://www.s4a.ch/eflight/fancalc_e.htm

Originally Posted by ApexAero

60mm - 2.375 inch is pretty close to what most of the 70mm arf mfg's have theirs. I think it depends on how slippery your airframe is as to how much you can effectively squeeze out of the efflux. Keep the diameter a fuzz larger for fixed gear
http://www.s4a.ch/eflight/fancalc_e.htm

Thanks a ton for that info. I have the LX Mig-29 but I think the nozzles are a bit too open.

no perfect size

on clean airframes 54-56mm

draggy airframes guessing 56-58mm

wemotecs factory exhaust nozzles are 55-56mm

2.1" is best all around in my 4-5 years of flying the wemo's

Originally Posted by AIR SALLY

2.1" is best all around in my 4-5 years of flying the wemo's

Wow ok. That is 54MM's give or take which surprises me as the exhaust diameter on this mig is around 65. Looks like I will be doing some mods.

just make an exhaust tube out some sheet plastic

best if you can go from the fan all the way back

I would go 56mm if you have a foam model with gear and panel lines

this will be a big improvement over stock

I would do that for sure as I've made many thrust tubes in the past (just not this small) but the fans are already installed and difficult to get out. Plus the jet has thrust vectoring as well so I will have to come up with a different solution. Hmmm you just gave me a good idea...

I will go the 56mm though.

Originally Posted by Mark

just make an exhaust tube out some sheet plastic

best if you can go from the fan all the way back

I would go 56mm if you have a foam model with gear and panel lines

this will be a big improvement over stock

Pete is that the thrust vectored Mig29? If so you can still add the thrust cone but the 56mm exhaust should come 2/3rds into the TV ball. If you are going Mini depending on which motor you choose you likely can go down to 54mm.

Max I went a bit of a different route. I am going with 55mm's and you can see the work done here. I just finished it. I would rather have gone directly from the fan itself but it wasn't possible so I think this solution will be ok.

https://www.rcgroups.com/forums/show...24381&page=130

(Scroll down to the bottom)

Originally Posted by Pepperpete

Max I went a bit of a different route. I am going with 55mm's and you can see the work done here. I just finished it. I would rather have gone directly from the fan itself but it wasn't possible so I think this solution will be ok.

https://www.rcgroups.com/forums/show...24381&page=130

(Scroll down to the bottom)

What's stopping a thrust tube off the motor? I found when I did it on the FW SU-34 to extend just past the rotational axis of the TV's joint, there was more thrust as it bypassed the rounded area of the TV but still made it effective against the TVs exit nozzle.

Simple...I glued the fan covers on as I've heard with the higher power setups in this bird that they will blow off with double sided tape etc. I realized the exit ducting looked incorrect after the fact (DOH). I could get them off again with some work but I didn't really want to do both of them.

So that was my solution.

If I hadn't glued them on first then your idea would have been what I would do.

Originally Posted by Maxthrottle

What's stopping a thrust tube off the motor? I found when I did it on the FW SU-34 to extend just past the rotational axis of the TV's joint, there was more thrust as it bypassed the rounded area of the TV but still made it effective against the TVs exit nozzle.

Wemotecs glass nozzles are 54mm, at least the ones I have are, calculate it out to 80% comes out to 54-55mm so you dont really want to go smaller than 54.