Sinew backed Osage ... shoots better upside down! Any ideas?

[bownarra]

My advise is to stop shooting your bow upside down! The true upper but lower when upside down limb is bending too hard. You will induce more unecessary set by doing this.
If it were me I would rework it to bend more in the outer limbs.
Your issues are almost certainly arrow spine.
you can 'cheat' spine if you have some loooong boo shafts Make them 40+" and you just have to have them stiff enough. This is why a lot of true primitive arrows are longer than the drawlength. As you use arrows closer and closer to your drawlength spine, tuning etc becomes much more important.
Arrows can bend the brain some times

[bradsmith2010]

good advice

[burchett.donald]

  Tommy, check your alignment...This may help?

http://www.primitivearcher.com/smf/index.php/topic,63133.0.html

Make sure, absolutely sure you have the right spine on your arrows...You look under spined in the video from my computer...
Way to much oscillation there...Deflection looks beyond maxed out right at release...Broadheads would magnify this flight into a possible curve ball...
                                                                                                                    Don

[Tommy D]

Thanks everyone. I have started with a 78# bamboo Bare shaft 32 inches and a 160 grain point. It’s coming off very nock left. Going to slowly shorten it till she comes off straight. Beginning to think even those full length carbons are also weak spined and I’ve been going the wrong way to fix the problem. I think they are about 65 spine equivalent. Will keep you posted.

[bradsmith2010]

thanks Tommy,, looking forward to seeing it shoot great for you,, I dont do alot of bare shafting,, so if you getting it shooting with some feathers, you can always fine tune with bare shafting too,,dont worry it gonna shoot,,

[George Tsoukalas]

I have had to flip the bow around to get good arrow flight on occasion. These days I make the limbs the same size and do not cut in a shelf expressly because of  that. Jawge

[Tommy D]

I have had to flip the bow around to get good arrow flight on occasion. These days I make the limbs the same size and do not cut in a shelf expressly because of  that. Jawge

I believe you! I started with a bare shaft bamboo arrow at 65# spine and it was coming off the bow nock left. I have shortened it and shortened it. I thought I was getting somewhere. It even went nock right sometimes when I shortened it enough. But no matter what I do it comes off the bow nock high. I have moved the nocking point ridiculously high and low and it still comes off the bow mostly nock left and high. I have tried three fingers under and Mediterranean. It doesn’t seem to matter. And none of the shots are consistent.

I flip the bow around and every arrow, carbon, long bamboo, short bamboo, high foc, low foc seems to fly like a dart. I just don’t get it! But it is just so... I thought I was going mad ... but I’ve truly tried it all...

One of the quirks of self bows I guess!

I think I am going to stop over thinking this!

I am going to take Bownarra’s advice and get my outer limbs bending a bit more - but beyond that if she wants to shoot upside down I am just going to accept it!

[DC]

You are in the Southern Hemisphere aren't you?

[Tommy D]

... you think it could be the Coriolis effect...

 

[bradsmith2010]

ok just a long shot,, please try  putting more pressure on your top finger,,

[Tommy D]

As in draw the string back with more pressure on the top finger... or push the top finger more against the arrow?

[bradsmith2010]

draw the sting back with more pressure on top finger and less on third finger,,