Flat hop issues

Chairs · March 7th, 2016, 15:06

Hey guys I recently flat hop my rifle and having issues where it seems to be under hoping. I have a promi 6.03 barrel with a prow in hop up unit with promi purple bucking and nomazu Flat hop nub cut to fit the pro win (followed amped airs oft video directions ect). Even with .25 and hop up turned all the way up I can't get it to over hop at all and not terribly accurate or consistent in how the bus flay after 50 yards.

cetane · March 7th, 2016, 16:18

Pull the barrel/hopup set out and look into it on the nozzle end. Roll the hopup up/on all the way. Do you see the rubber compressing into the barrel?

With the limited travel of the pro win, it might not be applying enough pressure to the robber to hop up

Chairs · March 7th, 2016, 16:48

Ya there definitely moving down into the window. I did not know prowin was considered to have a limited travel

Renegade) · March 7th, 2016, 16:54

If you have an old hopup rubber, cut a swath of it and super glue it to the round part of the flat nub to shim it so the hop arm applies more pressure.

Dont super glue it to the hop arm... just wanted to add that disclaimer in.

Rossco66 · March 7th, 2016, 16:57

Please don't confuse over hop with under hop if you've cranked the thing all the way on. If you've got too much hop it will mimic an under hop flight.

If the intrusion is very minor and barely visible it might be insufficient hop but if fully on the intrusion is taking up a significant amount of the opening then you may have an overhop situation.

Chairs · March 7th, 2016, 17:28

OK I was in aware that excessive hop can cause a almost no hop situation. I'm just really at a loss as that accuracy is worse than my krytacs oem hop up bucking/nub/barrel

ThunderCactus · March 7th, 2016, 19:34

Did you lose a ton of fps when you upgraded?

Chairs · March 7th, 2016, 21:27

I'm not sure as I hpa the rifle at the same time of doing this. Tho I am running at 90 psi and sitting around 400 fps with .20

Nozzle alignment has been shimmer and is good.

RainyEyes · March 7th, 2016, 21:42

Sorry to hear about your issue, but is it really necessary to open up a new thread: http://airsoftcanada.com/showthread.php?t=176302

Did you actually chrono or are you guessing based on psi?

Chairs · March 8th, 2016, 09:51

Bought a chrono and is shooting consistently. Figured the flying left was due to some nozzle misalignment so thought should open a different thread as I'm having some different issues Than I was back then with different hop up setup as well.

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March 7th, 2016, 15:06	#1
Chairs Trader rating Join Date: Aug 2015 Location: Saskatchewan	Flat hop issues Hey guys I recently flat hop my rifle and having issues where it seems to be under hoping. I have a promi 6.03 barrel with a prow in hop up unit with promi purple bucking and nomazu Flat hop nub cut to fit the pro win (followed amped airs oft video directions ect). Even with .25 and hop up turned all the way up I can't get it to over hop at all and not terribly accurate or consistent in how the bus flay after 50 yards.

March 7th, 2016, 16:18	#2
cetane Trader rating Join Date: Jun 2010 Location: Markham & Stouffville - Ontario - Canada	Pull the barrel/hopup set out and look into it on the nozzle end. Roll the hopup up/on all the way. Do you see the rubber compressing into the barrel? With the limited travel of the pro win, it might not be applying enough pressure to the robber to hop up __________________ Looking to get age verified in York region? Click link... Last edited by cetane; March 7th, 2016 at 16:20..

March 7th, 2016, 16:54	#4
Renegade) A Total Bastard Trader rating Join Date: Apr 2006 Location: Tottenham, Ontario	If you have an old hopup rubber, cut a swath of it and super glue it to the round part of the flat nub to shim it so the hop arm applies more pressure. Dont super glue it to the hop arm... just wanted to add that disclaimer in. __________________ W1-5

March 7th, 2016, 16:48	#3
Chairs Trader rating Join Date: Aug 2015 Location: Saskatchewan	Ya there definitely moving down into the window. I did not know prowin was considered to have a limited travel

March 7th, 2016, 16:57	#5
Rossco66 Trader rating Join Date: Aug 2013 Location: Burlington, Ontario	Please don't confuse over hop with under hop if you've cranked the thing all the way on. If you've got too much hop it will mimic an under hop flight. If the intrusion is very minor and barely visible it might be insufficient hop but if fully on the intrusion is taking up a significant amount of the opening then you may have an overhop situation. __________________

March 7th, 2016, 17:28	#6
Chairs Trader rating Join Date: Aug 2015 Location: Saskatchewan	OK I was in aware that excessive hop can cause a almost no hop situation. I'm just really at a loss as that accuracy is worse than my krytacs oem hop up bucking/nub/barrel

March 7th, 2016, 19:34	#7
ThunderCactus Not Eye Safe, Pretty Boy Maximus on the field take his picture! Trader rating Join Date: Feb 2007	Did you lose a ton of fps when you upgraded?

March 7th, 2016, 21:27	#8
Chairs Trader rating Join Date: Aug 2015 Location: Saskatchewan	I'm not sure as I hpa the rifle at the same time of doing this. Tho I am running at 90 psi and sitting around 400 fps with .20 Nozzle alignment has been shimmer and is good.

March 7th, 2016, 21:42	#9
RainyEyes Trader rating Join Date: Sep 2013 Location: Scarbororororough	Sorry to hear about your issue, but is it really necessary to open up a new thread: http://airsoftcanada.com/showthread.php?t=176302 Did you actually chrono or are you guessing based on psi?

March 8th, 2016, 09:51	#10
Chairs Trader rating Join Date: Aug 2015 Location: Saskatchewan	Bought a chrono and is shooting consistently. Figured the flying left was due to some nozzle misalignment so thought should open a different thread as I'm having some different issues Than I was back then with different hop up setup as well.

Flat hop issues

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