Overview

The Radio Controlled aircraft are legal. The Hummelbird with 9.6 lbs/ft2 (47 kg/M2) or 8.6 lbs/ft2 (42 kg/M2) vs the RAA limit of 30 kg/M2 is not legal.

WELL, take an FAA FAR Part 103 ‘holiday’ to the U.S. 🤩

But is it legal . Another dream , to fulfil my hopes of flying , one day in the future. spacesailor

This one will carry the hummelbird for a high altitude launch

Yep, I'm SURE! 😄

Look up the Galaxy Admin has just posted. Nev

Some have twin cylinder motors. Most are modeled on aerobatic aircraft like Extras, and they're great to watch because they fly like a normal aircraft and when they are doing aerobatics it's a lot more realistic There's a field with a 1,000 foot licence in the D314 (Danger) zone in the Carrum entrance point to Moorabbin Airporr from the Moorabbin training area, so if you're coming in from the east, best not to stray too far north for the entry. They get the performance from not carrying a human whereas the RAA aircraft are 300 kg MTOW (335 with floats, 320 with BRS) and wing loading 30 kg/M2.

ARE you sure? Nev

There are RC aircraft as big as that Hummelbird!

The Hbird started with 32hp . And , it's siste ship is FAA part 103 certified All metal good looking , Much better than a paraglider . spacesailor

Airplane that is, not the insect.😁

There is a cricket fitted with twin RC jets.

Needs to be a FAN jet to have much thrust. Nev

A large RC jet engine would be pretty cool in a sapphire.

I have looked at these engines and flown a Thruster with bmw 800 boxer with rotax c gearbox fitted. They are all very heavy compared to a Rotax 912. 5k will get a good used 912 and it is ready to go and proven.

YES. I keep looking from time to time.. V twins have Piston momentum advantages over other configurations. nev

I agree a nice little v twin and redrive would sound far better. As a Moto Guzzi and BMW fan , they just sound- right. A $5k budget would easily do a nice vtwin and Ace redrive with lots of quality mods for aero use. Thats full electric start, better carb including heat, digital ignition upgrades etc. not a bolt and play but not a huge challenge either. And would be much easier to nicely cowl in for a Sapphire or Saddler Vampire etc. should certainly be lower drag than a two smoke version. Huge amount of threads about them in Homebuiltairplanes site.

To listen to High revs like that would frankly tire me out It's OK in a Paramotor as you are too busy to notice the Noise. Its only Power to weight you need not Power per CC.. Some VEE Twin horizontal shaft Industrial motors come close to being suitable. Nev

Look up EOS Quattro. Single cylinder 4 VALVE Oil/air cooled. Light\, Revy economical about 30 HP. 500 Hour life. Nev

That's what I hated with my 582 powered xair. It used to spit oil onto the fabric tail skins. excellent engine though.

It would be pretty easy to cowl in a water cooled single and it's smaller exhaust especially four stroke. Some of the euro built ones look nice.

I was just taking a guess at 20 HP 2 stroke consumption. One of those little 4 stroke paramotors would sip fuel .

The only one I have seen was bought off Kasper in this group. That had a kfm 20 HP 2 stroke. Supposed to have had a top speed of 80 knots.

2 stroke s were generally the "thing" for Power/ weight. Nev

The one originally Fitted. A Rotax 447. Nev