Author Topic: Buying an H-700  (Read 1180 times)

joeblow

Buying an H-700
« on: December 26, 2020, 09:26:38 AM »
So I am wanting a Helio/C-185 and my wife wants a 210/310 etc. In other words she wants to go fast and far and I want to go low and slow. Well my thought process is if I get a H-700 with the TIO-540 I can go high enough on O2 to get the TAS. My question is how fast can it go? I cant find any info on the H-700 cruise speeds at various altitudes. I have also found a few C-185s with TSIO-540s that I cant find speed info on either.

Anybody have any insight on this?
« Last Edit: December 27, 2020, 05:04:48 PM by joeblow »

xeyes

Re: Buying an H-700
« Reply #1 on: December 26, 2020, 09:36:48 AM »

xeyes

Re: Buying an H-700
« Reply #2 on: December 26, 2020, 09:39:27 AM »
Buy the green Pima Helio from Mr Locker and put a cruise prop on it.

Doug Johnson

Re: Buying an H-700
« Reply #3 on: December 26, 2020, 03:38:57 PM »
If you want to go fast this is probably what You should look at first c/n 559 no. 8 in the 16 helios and 3 projects for sale. I'm pretty sure you would be in the experimental exibition category but if you get some advice on how to write up your registration my understanding is that it isn't that big of a deal.

The problem with  the H-700 is a poorly designed cowling that leads to excessive fuel burn to keep the engine cool enough. There is a pricey aftermarket cowling STC'ed to address this poblem but I'm not sure if it is available at any price.

For sale here  https://www.stratusaero.us/helio-turbinecourier?fbclid=IwAR2fhUk655SFiPtwVnJ5CePURWBAEH25dM-ZRUxmAaPsBpzDC5c0Vm2UjZk

see more here http://flyhelio.com/smf/index.php?topic=820.msg3886#msg3886
Doug

Jason Stephens

Re: Buying an H-700
« Reply #4 on: December 27, 2020, 12:32:17 PM »
What about a STC'd turbo kit on a H-395/295?  That could possibly make a big difference in cruise up at higher altitudes.

joeblow

Re: Buying an H-700
« Reply #5 on: December 27, 2020, 01:43:38 PM »
#559 is out of the budget.

OK so there is an overheating issue with the H-700? Spending $400K+ then another thousand hours to put #559 into the air seems a lot harder that doing some cowling work to an H-700 to keep it cool. Perhaps adding an improved intercooler or cowl flaps, or louvers etc. and either buying an STC or even getting a field approval.

So just doing some basic e6b calculations a Helio at 10K ft that shows 135kts corrected will do 190 kts at 22K ft. So technically an H-700 with pilot on O2 will go 210 fast at altitude. This would satisfy my wife and still let me get a Helio. The other thing that seems possibly concerning is the composite gear delamination issue. Anything on this? Any other parts availability issues?

joeblow

Re: Buying an H-700
« Reply #6 on: December 27, 2020, 02:45:13 PM »
What about a STC'd turbo kit on a H-395/295?  That could possibly make a big difference in cruise up at higher altitudes.

Is there a Turbo STC kit for the 295/395?

TreeTopFlyer

Re: Buying an H-700
« Reply #7 on: December 28, 2020, 05:32:06 AM »
Yes there is an STC for turbo's on the H295/395...my plane N295LA has turbos...originally turbos I believe were RAYJAY corporation..name has changed I think, not home right now...They do make a big difference above 10,000 and above...

and of course also help for takeoffs at altitude...ie..Reno is at 4500 ft....where I live..

Personally I agree totally with Stephen Ruby....when they tried to bring Helio's back...with H700/800's they weren't as good....540...much greater fuel burn...gear legs...silly wingtips...performance not as good for T/O & Ldgs....Understand Lycoming wasn't making geared engines at the time....GIO-480...is a great engine for the platform...

Just my opinion...don't want to hurt feelings of H700/800 owners!

TreeTopFlyer

Re: Buying an H-700
« Reply #8 on: December 28, 2020, 05:41:08 AM »
PS...Google Jerry Jaques...Helio vs C185..He has owned 3 Helio's/C185/Supercubs...he does great job of explaining Pro's and Cons...

For going into Backcountry with 4 plus seats...the helio excels and probably safest single out there....ie.... roll cage...survivability....if you want to talk more send message and I'll call you..

Doug Johnson

Re: Buying an H-700
« Reply #9 on: December 28, 2020, 06:26:01 AM »
You can find the stc STC SA2141CE and pictures of the cowling for the H-700 c/n, H-7 as 5B-CIH here

I havent checked for about 7 years but it may still be in the bunch of aircraft removed from service in Cypress in a lot near the control tower

http://flyhelio.com/smf/index.php?topic=1232.msg4729#msg4729

The H-295/395 twin turbocharger was Rajay-Riley now Roto-Master  and looked up the STC SE124SO

Its probably an easier fit for going high than the H-700. Plus if you went with a trigear and did some work to beef up the nose gear and Jaars has an stc for a speed mod STC SA00788AT that might prove interesting, You would have a really safe airplane that would go any place a c-206 could go.

I've wondered about the TGIO-540 as a replacment for the GO-480 and discovered it was nearly as heavy as the O-720 used in the H-800 which creates all kind of problems like the need for a larger stabilator.

So You are back to the turocharged GO-480 it might be interesting to go to a turbocharged GIO-480 I don't think that has been done yet.
« Last Edit: December 29, 2020, 01:32:55 AM by Doug Johnson »
Doug

TreeTopFlyer

Re: Buying an H-700
« Reply #10 on: December 28, 2020, 09:25:54 AM »
"The H-295 twin turbocharger is Rayjay-Riley now Roto-Master  and looked up the STC SE124SO "

Yup..Doug is 100% correct couldn't remember name Rayjay's had become....Thanks Doug

TreeTopFlyer

Re: Buying an H-700
« Reply #11 on: December 28, 2020, 09:28:01 AM »
I love Helio's.  But Tricycle gear Helio's?   Well. Sorry for hurting feelings "They Just Look Wrong!"

LOL!

jmetzler

Re: Buying an H-700
« Reply #12 on: December 28, 2020, 03:01:06 PM »
Rajay (just one "y") is now Rajay Turbo Products located in Spring Branch TX. Web address is www.rajay.aero. They list the STC for H295/H395. Jim

TreeTopFlyer

Re: Buying an H-700
« Reply #13 on: December 28, 2020, 04:40:43 PM »
Did not know that...Thanks Jim...had some info in my manuals had changed to Rotomaster...but guess its changed again....thats good to know....do they support all older Rajays...same parts?

jmetzler

Re: Buying an H-700
« Reply #14 on: December 28, 2020, 04:52:30 PM »
I talked to them shortly after they bought the line and they seemed like they would support the older systems though at that time they didn't have a lot on the shelf and I think they were working on PMA. PMA should be in place and hopefully they can get you what ever is needed. Jim