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Hammock Mod, MX20

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george.mueller(at)aurora.
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Posted: Thu May 08, 2008 5:33 am Post subject: Hammock Mod, MX20

Are there any downsides to the Hammock engine mods, putting a 260hp in an older Bonanza (E35)?  I understand they beef up the airframe as part of the mod, but I am wondering if anyone has experienced any downsides to this. 

 

Also, I am not real familiar with the Garmin MX 20, but I am wondering if the fact that this unit has been discontinued by Garmin affect its value and utility?  Can you still get updates etc?  Is it still supported by Garmin? 

 

 

 

 

George in Milwaukee [quote][b]

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dhschultz39(at)msn.com
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Posted: Thu May 08, 2008 6:07 am Post subject: Hammock Mod, MX20

don't know if you're open to alternative  suggestions or not george, but if you are (especially if starting with an  E-225-, i have direct experience + 150 hrs in a c35 bonanza with the aviation  research mod (STC) to put o-470 cylinders on an e-225 case (they have a  web-site, and firm is located in Sandy, Or.) 

  works very well (163 kts, 1500 fpm, 11 gph)  with no airframe mods required except those related to baffling.  the only  downside i've experienced is cylinders run a max of 300 deg F, not as warm as i  would like.

  

 if you want more info..., e-mail/call is  fine.

  

 wrt garmin-mx-20, no info.  but directly  related - have a 15 yr old Garmin IFR GPS155 (not the newer  155XL), purchased when Garmin came out w/ their first IFR unit.  Garmin  does not support maintenance or repairs, but my local radio shop (Tacoma, WA)  took care of it no problem, new battery, minor parts, alignment, and it works  great.

  

 dave schultz

 bremerton, wa

 360 692-3445

 [quote]   ---

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rmhou(at)yahoo.com
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Posted: Fri May 09, 2008 9:52 am Post subject: Hammock Mod, MX20

 	  Quote: 	
		  Are there any downsides to the Hammock engine mods, putting a 260hp in

 >an older Bonanza (E35)?  
	


   

  Possible W&B issues.  A friend has IO-520 w/ 3-blade prop (about same weight as IO-470N) in his G with tip tanks.  His CG is almost always in front of forward limit.  The tip tanks (Osborn) contributed to this issue because these tanks cause narrower CG envelope.  But we tried diffent loads assuming tips are removed, and it is still very limited.

   

  E225 is much lighter.  I have no experience but have hear good things about N cylinders on E engines.

   

  Robin Hou

  64 S35

  54 E35 (sold after 11 years & remorse)



         Be a better friend, newshound, and  [quote][b]

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rleebue(at)gmail.com
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Posted: Sat May 10, 2008 3:37 am Post subject: Hammock Mod, MX20

Hi George --  Before you shove a IO-470N into an E Bonanza, check with Jerry Forston at  Aviation Research Systems, Inc of Sandy, Oregon, for his STC which mates 470N  cylinders to the E-225 case.  I did this for my C model, and am extremely happy  with the outcome.  Jerry can be reached at (503) 668-4542 or (888) 301-9207 for  toll free.  Roughy, here are the benefits to go this route:

  

 1. Much less  expensive {than standard IO-470N}

 2. Minimal  airframe changes needed {than standard IO-470N}

 3. No CG  issues {than standard IO-470N}

 4. Better  jug cooling {than E-225}

 5.  Significantly better performance {than E-225}

 6. Longer  jug life {than E-225}

 7. Less oil  consumption {thasn E-225}

  

 Downside --  you can no longer use autogas.

  

  Good luck -- Lee Buechler/N241EE



 

  [quote][b]

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