ORIGINAL: bubbagates
ORIGINAL: terryj
Hi Bill,
How is that CG Sukhoi with the G-26? Is the ignition by Cunningham?
I'm running one in a Cermark Pitts. thinking about converting my Sig Extra 300 SX from the OS-160 FX to the Hanson 260. It seems like it has plenty of power. The 160 is fine but it goes thru a lot of fuel. And my "connection" for fuel has dried up. 5% is $15 at HobbyPeople.
Yep, that's one of Cunnighams converions and it is sweet. The plane is a little heavier with it but not by much. I replaced the stock gear with the graphtec CF gear and save almost 8oz. I'll get you an AUW but I ran the numbers on the following thread and they should be right around 12lbs. It does great but not umlimited vertical which is fine by me. 3D is defintely out for this combo but again this plane is being built this way for IMAC and nothing else.
-- I couldn't agree more. I have had a couple of G-23s with stock mags. This developes more power-- not due to the ignition but rather the increased displacement. But it starts sooo easy. Mid range is cleaner too. I only have about 15 flights on it and it gets better each time. When the weather breaks (it's rained here the last couple of weekends) it's time to switch to synthetic oil. My fuel is still a bit rich. First 1/2 gal 25:1 petroleum-based lube. Then 1/2 gal added at 32:1 followed by one more 1/2 gal at 32:1. Next batch will be "pure" 32:1 synth. My Pitts weighs 13.6 lbs. Like your plane you have to land a bit hot-- but just a bit. If I get too slow and and am low enough it stalls straight away and "plops down" for a 3 point with a slight bounce. Better with just a smidge more speed and power.
http://www.rcuniverse.com/forum/m_25...tm.htm#2558391 post 13 has the planes weight and post 29 has the weight for the engine and accessories
It does need to land somehwat hot but nothing I cannot handle and if the throws are to high and it will snap out. I have a feeling though that is my trim as I really have not trimmed this plane yet. I may have more movement on the right elevator than left because it always snaps out to the right. Also all of my throws are at least 40 degrees so it just may be too much.
If I go to low (50%) or mid (75%) then it does not snap but still drops the right wing. Lateral balance is fine.
Basically my plane is this
8lbs 11oz without the engine
Engine 2lbs 9.5oz without the backplate
Abellrc Muffler (not the Pitts): 4.7oz with the bolts
and remove 8oz for the gear replacement
So without the gear change the plane weighed 10lbs 26oz or 11lbs 10oz
now subtract 8oz for the gear replacement and you now have 11lbs 2oz plus add 2.0oz for the choke servo and control rod and the 4.5oz for the ignition batt (JR1100MaH) for an AUW dry of 11lbs 8.5oz
Not to bad...
I originally had an OS120 w/pump on it and needed 6oz on the nose to balance on the recommended point. I figured that the converted Zenoah would just about work perfectly which it did and was able to remove the 6oz. The gear change was an after thought and I am considering going to a CF wing tube to save a little more
-- My Pitts gained about 1 1/4 lb. over the original YS-120 FZ. When it got cranky, I installed a Saito 180. Very nice combo but man does it burn fuel. Don't know what it weighted THINK the plane flies faster with the G-26-- not that I'm a speed freak but that is one measure of power. Vertical is fine but not unlimited.
-- My Extra weighs 13.96 with the OS 160. 73" span. I have flown a Hanger 9 Cap 232 with a G-23. Alright. Nothing to get excited over. I'm guessing that the Extra would also gain at least a lb. converting. Since you are flying both a 160 in a slightly smaller Extra and the G-26 in the Sukhoi, I certaonly appreciate your opinion on the swap.