I have 2 ECHO blowers, one says PB 24 type 1E, the other says ES 1000 on the engine case . Is either a good conversion canditate.
Motorhd

The PB 24 most likely is a PB-2400 and is 23.6cc. Nice motor and have done a bunch of them. The ES-1000 is a shredder/vac and is 21.2cc. I have done some of these too and they are OK for sport flying or in a 60 size plane.

Heres a pic of my 24cc.3-1/2 lbs RTF.stock carb,72-7300 on a 16x8 mas.could do better if i put a 10mm carb on it.Im working on a 21cc also right now.Still working on my 61cc twin.tim220225 has done a lot.His 61 looks real nice but he also got the last nice looking parts from BME before i could get some.Oh well.mines looking good anyway.

Not true.
I purchased a set of mufflers for my 61 twin from Keith the day brfore he shut it down.

Boy those things are puuurty too. You will love the way they sound. Kind of throaty and deep sounding. I bet Keith still has piles of parts around. Then again maybe the new guys bought all of it.

I still have not received my 62 back from Ralph.
It's about 3 weeks over due.
I did fly my Mr. Mulligan with a G-62 on it.
The power was pretty good, but I di.d need full throttle to do a decent loop.
That's with a 22 x 10w Apc prop.

What prop will the Echo Twin turn?

I ran mine with a 22/8 but a 22/10 would have been better.

Thats weird,i called and talked to keith last year and he said he didnt have any parts left for the echo twins and he said he sold the last of the prop hubs and accesarys to tim.Then i talked to tim and said so also.Oh well,doesnt matter.Ill call the new guys and see if they bought any parts or what parts they got from keith.The plane you where asking about is my proctor antic.Built in about 1972.(still flying).A friend of mine father passed away and he gave me a few of his planes.So im restoring them to flying condition.Thats one of them.He has 2 really nice 1/3 scale pups or camels,dont remember wich one.He also has the 1/3 stearman from Balsa usa.112 inch i think.His dad used to help Cole Paelan at Rhineback.